pg_regress.c

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/*-------------------------------------------------------------------------
 *
 * pg_regress --- regression test driver
 *
 * This is a C implementation of the previous shell script for running
 * the regression tests, and should be mostly compatible with it.
 * Initial author of C translation: Magnus Hagander
 *
 * This code is released under the terms of the PostgreSQL License.
 *
 * Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/test/regress/pg_regress.c
 *
 *-------------------------------------------------------------------------
 */
 
#include "postgres_fe.h"
 
#include <ctype.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <signal.h>
#include <unistd.h>
 
#include "common/logging.h"
#include "common/restricted_token.h"
#include "common/string.h"
#include "common/username.h"
#include "getopt_long.h"
#include "lib/stringinfo.h"
#include "libpq/pqcomm.h"       /* needed for UNIXSOCK_PATH() */
#include "pg_config_paths.h"
#include "pg_regress.h"
#include "portability/instr_time.h"
 
/* for resultmap we need a list of pairs of strings */
typedef struct _resultmap
{
    char       *test;
    char       *type;
    char       *resultfile;
    struct _resultmap *next;
} _resultmap;
 
/*
 * Values obtained from Makefile.
 */
char       *host_platform = HOST_TUPLE;
 
#ifndef WIN32                   /* not used in WIN32 case */
static char *shellprog = SHELLPROG;
#endif
 
/*
 * On Windows we use -w in diff switches to avoid problems with inconsistent
 * newline representation.  The actual result files will generally have
 * Windows-style newlines, but the comparison files might or might not.
 */
#ifndef WIN32
const char *basic_diff_opts = "";
const char *pretty_diff_opts = "-U3";
#else
const char *basic_diff_opts = "-w";
const char *pretty_diff_opts = "-w -U3";
#endif
 
/* options settable from command line */
_stringlist *dblist = NULL;
bool        debug = false;
char       *inputdir = ".";
char       *outputdir = ".";
char       *expecteddir = ".";
char       *bindir = PGBINDIR;
char       *launcher = NULL;
static _stringlist *loadextension = NULL;
static int  max_connections = 0;
static int  max_concurrent_tests = 0;
static char *encoding = NULL;
static _stringlist *schedulelist = NULL;
static _stringlist *extra_tests = NULL;
static char *temp_instance = NULL;
static _stringlist *temp_configs = NULL;
static bool nolocale = false;
static bool use_existing = false;
static char *hostname = NULL;
static int  port = -1;
static bool port_specified_by_user = false;
static char *dlpath = PKGLIBDIR;
static char *user = NULL;
static _stringlist *extraroles = NULL;
static char *config_auth_datadir = NULL;
 
/* internal variables */
static const char *progname;
static char *logfilename;
static FILE *logfile;
static char *difffilename;
static const char *sockdir;
static const char *temp_sockdir;
static char sockself[MAXPGPATH];
static char socklock[MAXPGPATH];
 
static _resultmap *resultmap = NULL;
 
static PID_TYPE postmaster_pid = INVALID_PID;
static bool postmaster_running = false;
 
static int  success_count = 0;
static int  fail_count = 0;
 
static bool directory_exists(const char *dir);
static void make_directory(const char *dir);
 
static void header(const char *fmt,...) pg_attribute_printf(1, 2);
static void status(const char *fmt,...) pg_attribute_printf(1, 2);
static StringInfo psql_start_command(void);
static void psql_add_command(StringInfo buf, const char *query,...) pg_attribute_printf(2, 3);
static void psql_end_command(StringInfo buf, const char *database);
 
/*
 * allow core files if possible.
 */
#if defined(HAVE_GETRLIMIT)
static void
unlimit_core_size(void)
{
    struct rlimit lim;
 
    getrlimit(RLIMIT_CORE, &lim);
    if (lim.rlim_max == 0)
    {
        fprintf(stderr,
                _("%s: could not set core size: disallowed by hard limit\n"),
                progname);
        return;
    }
    else if (lim.rlim_max == RLIM_INFINITY || lim.rlim_cur < lim.rlim_max)
    {
        lim.rlim_cur = lim.rlim_max;
        setrlimit(RLIMIT_CORE, &lim);
    }
}
#endif
 
 
/*
 * Add an item at the end of a stringlist.
 */
void
add_stringlist_item(_stringlist **listhead, const char *str)
{
    _stringlist *newentry = pg_malloc(sizeof(_stringlist));
    _stringlist *oldentry;
 
    newentry->str = pg_strdup(str);
    newentry->next = NULL;
    if (*listhead == NULL)
        *listhead = newentry;
    else
    {
        for (oldentry = *listhead; oldentry->next; oldentry = oldentry->next)
             /* skip */ ;
        oldentry->next = newentry;
    }
}
 
/*
 * Free a stringlist.
 */
static void
free_stringlist(_stringlist **listhead)
{
    if (listhead == NULL || *listhead == NULL)
        return;
    if ((*listhead)->next != NULL)
        free_stringlist(&((*listhead)->next));
    free((*listhead)->str);
    free(*listhead);
    *listhead = NULL;
}
 
/*
 * Split a delimited string into a stringlist
 */
static void
split_to_stringlist(const char *s, const char *delim, _stringlist **listhead)
{
    char       *sc = pg_strdup(s);
    char       *token = strtok(sc, delim);
 
    while (token)
    {
        add_stringlist_item(listhead, token);
        token = strtok(NULL, delim);
    }
    free(sc);
}
 
/*
 * Print a progress banner on stdout.
 */
static void
header(const char *fmt,...)
{
    char        tmp[64];
    va_list     ap;
 
    va_start(ap, fmt);
    vsnprintf(tmp, sizeof(tmp), fmt, ap);
    va_end(ap);
 
    fprintf(stdout, "============== %-38s ==============\n", tmp);
    fflush(stdout);
}
 
/*
 * Print "doing something ..." --- supplied text should not end with newline
 */
static void
status(const char *fmt,...)
{
    va_list     ap;
 
    va_start(ap, fmt);
    vfprintf(stdout, fmt, ap);
    fflush(stdout);
    va_end(ap);
 
    if (logfile)
    {
        va_start(ap, fmt);
        vfprintf(logfile, fmt, ap);
        va_end(ap);
    }
}
 
/*
 * Done "doing something ..."
 */
static void
status_end(void)
{
    fprintf(stdout, "\n");
    fflush(stdout);
    if (logfile)
        fprintf(logfile, "\n");
}
 
/*
 * shut down temp postmaster
 */
static void
stop_postmaster(void)
{
    if (postmaster_running)
    {
        /* We use pg_ctl to issue the kill and wait for stop */
        char        buf[MAXPGPATH * 2];
        int         r;
 
        snprintf(buf, sizeof(buf),
                 "\"%s%spg_ctl\" stop -D \"%s/data\" -s",
                 bindir ? bindir : "",
                 bindir ? "/" : "",
                 temp_instance);
        fflush(NULL);
        r = system(buf);
        if (r != 0)
        {
            fprintf(stderr, _("\n%s: could not stop postmaster: exit code was %d\n"),
                    progname, r);
            _exit(2);           /* not exit(), that could be recursive */
        }
 
        postmaster_running = false;
    }
}
 
/*
 * Remove the socket temporary directory.  pg_regress never waits for a
 * postmaster exit, so it is indeterminate whether the postmaster has yet to
 * unlink the socket and lock file.  Unlink them here so we can proceed to
 * remove the directory.  Ignore errors; leaking a temporary directory is
 * unimportant.  This can run from a signal handler.  The code is not
 * acceptable in a Windows signal handler (see initdb.c:trapsig()), but
 * on Windows, pg_regress does not use Unix sockets by default.
 */
static void
remove_temp(void)
{
    Assert(temp_sockdir);
    unlink(sockself);
    unlink(socklock);
    rmdir(temp_sockdir);
}
 
/*
 * Signal handler that calls remove_temp() and reraises the signal.
 */
static void
signal_remove_temp(SIGNAL_ARGS)
{
    remove_temp();
 
    pqsignal(postgres_signal_arg, SIG_DFL);
    raise(postgres_signal_arg);
}
 
/*
 * Create a temporary directory suitable for the server's Unix-domain socket.
 * The directory will have mode 0700 or stricter, so no other OS user can open
 * our socket to exploit our use of trust authentication.  Most systems
 * constrain the length of socket paths well below _POSIX_PATH_MAX, so we
 * place the directory under /tmp rather than relative to the possibly-deep
 * current working directory.
 *
 * Compared to using the compiled-in DEFAULT_PGSOCKET_DIR, this also permits
 * testing to work in builds that relocate it to a directory not writable to
 * the build/test user.
 */
static const char *
make_temp_sockdir(void)
{
    char       *template = psprintf("%s/pg_regress-XXXXXX",
                                    getenv("TMPDIR") ? getenv("TMPDIR") : "/tmp");
 
    temp_sockdir = mkdtemp(template);
    if (temp_sockdir == NULL)
    {
        fprintf(stderr, _("%s: could not create directory \"%s\": %s\n"),
                progname, template, strerror(errno));
        exit(2);
    }
 
    /* Stage file names for remove_temp().  Unsafe in a signal handler. */
    UNIXSOCK_PATH(sockself, port, temp_sockdir);
    snprintf(socklock, sizeof(socklock), "%s.lock", sockself);
 
    /* Remove the directory during clean exit. */
    atexit(remove_temp);
 
    /*
     * Remove the directory before dying to the usual signals.  Omit SIGQUIT,
     * preserving it as a quick, untidy exit.
     */
    pqsignal(SIGHUP, signal_remove_temp);
    pqsignal(SIGINT, signal_remove_temp);
    pqsignal(SIGPIPE, signal_remove_temp);
    pqsignal(SIGTERM, signal_remove_temp);
 
    return temp_sockdir;
}
 
/*
 * Check whether string matches pattern
 *
 * In the original shell script, this function was implemented using expr(1),
 * which provides basic regular expressions restricted to match starting at
 * the string start (in conventional regex terms, there's an implicit "^"
 * at the start of the pattern --- but no implicit "$" at the end).
 *
 * For now, we only support "." and ".*" as non-literal metacharacters,
 * because that's all that anyone has found use for in resultmap.  This
 * code could be extended if more functionality is needed.
 */
static bool
string_matches_pattern(const char *str, const char *pattern)
{
    while (*str && *pattern)
    {
        if (*pattern == '.' && pattern[1] == '*')
        {
            pattern += 2;
            /* Trailing .* matches everything. */
            if (*pattern == '\0')
                return true;
 
            /*
             * Otherwise, scan for a text position at which we can match the
             * rest of the pattern.
             */
            while (*str)
            {
                /*
                 * Optimization to prevent most recursion: don't recurse
                 * unless first pattern char might match this text char.
                 */
                if (*str == *pattern || *pattern == '.')
                {
                    if (string_matches_pattern(str, pattern))
                        return true;
                }
 
                str++;
            }
 
            /*
             * End of text with no match.
             */
            return false;
        }
        else if (*pattern != '.' && *str != *pattern)
        {
            /*
             * Not the single-character wildcard and no explicit match? Then
             * time to quit...
             */
            return false;
        }
 
        str++;
        pattern++;
    }
 
    if (*pattern == '\0')
        return true;            /* end of pattern, so declare match */
 
    /* End of input string.  Do we have matching pattern remaining? */
    while (*pattern == '.' && pattern[1] == '*')
        pattern += 2;
    if (*pattern == '\0')
        return true;            /* end of pattern, so declare match */
 
    return false;
}
 
/*
 * Scan resultmap file to find which platform-specific expected files to use.
 *
 * The format of each line of the file is
 *         testname/hostplatformpattern=substitutefile
 * where the hostplatformpattern is evaluated per the rules of expr(1),
 * namely, it is a standard regular expression with an implicit ^ at the start.
 * (We currently support only a very limited subset of regular expressions,
 * see string_matches_pattern() above.)  What hostplatformpattern will be
 * matched against is the config.guess output.  (In the shell-script version,
 * we also provided an indication of whether gcc or another compiler was in
 * use, but that facility isn't used anymore.)
 */
static void
load_resultmap(void)
{
    char        buf[MAXPGPATH];
    FILE       *f;
 
    /* scan the file ... */
    snprintf(buf, sizeof(buf), "%s/resultmap", inputdir);
    f = fopen(buf, "r");
    if (!f)
    {
        /* OK if it doesn't exist, else complain */
        if (errno == ENOENT)
            return;
        fprintf(stderr, _("%s: could not open file \"%s\" for reading: %s\n"),
                progname, buf, strerror(errno));
        exit(2);
    }
 
    while (fgets(buf, sizeof(buf), f))
    {
        char       *platform;
        char       *file_type;
        char       *expected;
        int         i;
 
        /* strip trailing whitespace, especially the newline */
        i = strlen(buf);
        while (i > 0 && isspace((unsigned char) buf[i - 1]))
            buf[--i] = '\0';
 
        /* parse out the line fields */
        file_type = strchr(buf, ':');
        if (!file_type)
        {
            fprintf(stderr, _("incorrectly formatted resultmap entry: %s\n"),
                    buf);
            exit(2);
        }
        *file_type++ = '\0';
 
        platform = strchr(file_type, ':');
        if (!platform)
        {
            fprintf(stderr, _("incorrectly formatted resultmap entry: %s\n"),
                    buf);
            exit(2);
        }
        *platform++ = '\0';
        expected = strchr(platform, '=');
        if (!expected)
        {
            fprintf(stderr, _("incorrectly formatted resultmap entry: %s\n"),
                    buf);
            exit(2);
        }
        *expected++ = '\0';
 
        /*
         * if it's for current platform, save it in resultmap list. Note: by
         * adding at the front of the list, we ensure that in ambiguous cases,
         * the last match in the resultmap file is used. This mimics the
         * behavior of the old shell script.
         */
        if (string_matches_pattern(host_platform, platform))
        {
            _resultmap *entry = pg_malloc(sizeof(_resultmap));
 
            entry->test = pg_strdup(buf);
            entry->type = pg_strdup(file_type);
            entry->resultfile = pg_strdup(expected);
            entry->next = resultmap;
            resultmap = entry;
        }
    }
    fclose(f);
}
 
/*
 * Check in resultmap if we should be looking at a different file
 */
static
const char *
get_expectfile(const char *testname, const char *file)
{
    char       *file_type;
    _resultmap *rm;
 
    /*
     * Determine the file type from the file name. This is just what is
     * following the last dot in the file name.
     */
    if (!file || !(file_type = strrchr(file, '.')))
        return NULL;
 
    file_type++;
 
    for (rm = resultmap; rm != NULL; rm = rm->next)
    {
        if (strcmp(testname, rm->test) == 0 && strcmp(file_type, rm->type) == 0)
        {
            return rm->resultfile;
        }
    }
 
    return NULL;
}
 
/*
 * Prepare environment variables for running regression tests
 */
static void
initialize_environment(void)
{
    /*
     * Set default application_name.  (The test_start_function may choose to
     * override this, but if it doesn't, we have something useful in place.)
     */
    setenv("PGAPPNAME", "pg_regress", 1);
 
    /*
     * Set variables that the test scripts may need to refer to.
     */
    setenv("PG_ABS_SRCDIR", inputdir, 1);
    setenv("PG_ABS_BUILDDIR", outputdir, 1);
    setenv("PG_LIBDIR", dlpath, 1);
    setenv("PG_DLSUFFIX", DLSUFFIX, 1);
 
    if (nolocale)
    {
        /*
         * Clear out any non-C locale settings
         */
        unsetenv("LC_COLLATE");
        unsetenv("LC_CTYPE");
        unsetenv("LC_MONETARY");
        unsetenv("LC_NUMERIC");
        unsetenv("LC_TIME");
        unsetenv("LANG");
 
        /*
         * Most platforms have adopted the POSIX locale as their
         * implementation-defined default locale.  Exceptions include native
         * Windows, macOS with --enable-nls, and Cygwin with --enable-nls.
         * (Use of --enable-nls matters because libintl replaces setlocale().)
         * Also, PostgreSQL does not support macOS with locale environment
         * variables unset; see PostmasterMain().
         */
#if defined(WIN32) || defined(__CYGWIN__) || defined(__darwin__)
        setenv("LANG", "C", 1);
#endif
    }
 
    /*
     * Set translation-related settings to English; otherwise psql will
     * produce translated messages and produce diffs.  (XXX If we ever support
     * translation of pg_regress, this needs to be moved elsewhere, where psql
     * is actually called.)
     */
    unsetenv("LANGUAGE");
    unsetenv("LC_ALL");
    setenv("LC_MESSAGES", "C", 1);
 
    /*
     * Set encoding as requested
     */
    if (encoding)
        setenv("PGCLIENTENCODING", encoding, 1);
    else
        unsetenv("PGCLIENTENCODING");
 
    /*
     * Set timezone and datestyle for datetime-related tests
     */
    setenv("PGTZ", "PST8PDT", 1);
    setenv("PGDATESTYLE", "Postgres, MDY", 1);
 
    /*
     * Likewise set intervalstyle to ensure consistent results.  This is a bit
     * more painful because we must use PGOPTIONS, and we want to preserve the
     * user's ability to set other variables through that.
     */
    {
        const char *my_pgoptions = "-c intervalstyle=postgres_verbose";
        const char *old_pgoptions = getenv("PGOPTIONS");
        char       *new_pgoptions;
 
        if (!old_pgoptions)
            old_pgoptions = "";
        new_pgoptions = psprintf("%s %s",
                                 old_pgoptions, my_pgoptions);
        setenv("PGOPTIONS", new_pgoptions, 1);
        free(new_pgoptions);
    }
 
    if (temp_instance)
    {
        /*
         * Clear out any environment vars that might cause psql to connect to
         * the wrong postmaster, or otherwise behave in nondefault ways. (Note
         * we also use psql's -X switch consistently, so that ~/.psqlrc files
         * won't mess things up.)  Also, set PGPORT to the temp port, and set
         * PGHOST depending on whether we are using TCP or Unix sockets.
         *
         * This list should be kept in sync with PostgreSQL/Test/Utils.pm.
         */
        unsetenv("PGCHANNELBINDING");
        /* PGCLIENTENCODING, see above */
        unsetenv("PGCONNECT_TIMEOUT");
        unsetenv("PGDATA");
        unsetenv("PGDATABASE");
        unsetenv("PGGSSENCMODE");
        unsetenv("PGGSSLIB");
        /* PGHOSTADDR, see below */
        unsetenv("PGKRBSRVNAME");
        unsetenv("PGPASSFILE");
        unsetenv("PGPASSWORD");
        unsetenv("PGREQUIREPEER");
        unsetenv("PGREQUIRESSL");
        unsetenv("PGSERVICE");
        unsetenv("PGSERVICEFILE");
        unsetenv("PGSSLCERT");
        unsetenv("PGSSLCRL");
        unsetenv("PGSSLCRLDIR");
        unsetenv("PGSSLKEY");
        unsetenv("PGSSLMAXPROTOCOLVERSION");
        unsetenv("PGSSLMINPROTOCOLVERSION");
        unsetenv("PGSSLMODE");
        unsetenv("PGSSLROOTCERT");
        unsetenv("PGSSLSNI");
        unsetenv("PGTARGETSESSIONATTRS");
        unsetenv("PGUSER");
        /* PGPORT, see below */
        /* PGHOST, see below */
 
        if (hostname != NULL)
            setenv("PGHOST", hostname, 1);
        else
        {
            sockdir = getenv("PG_REGRESS_SOCK_DIR");
            if (!sockdir)
                sockdir = make_temp_sockdir();
            setenv("PGHOST", sockdir, 1);
        }
        unsetenv("PGHOSTADDR");
        if (port != -1)
        {
            char        s[16];
 
            sprintf(s, "%d", port);
            setenv("PGPORT", s, 1);
        }
    }
    else
    {
        const char *pghost;
        const char *pgport;
 
        /*
         * When testing an existing install, we honor existing environment
         * variables, except if they're overridden by command line options.
         */
        if (hostname != NULL)
        {
            setenv("PGHOST", hostname, 1);
            unsetenv("PGHOSTADDR");
        }
        if (port != -1)
        {
            char        s[16];
 
            sprintf(s, "%d", port);
            setenv("PGPORT", s, 1);
        }
        if (user != NULL)
            setenv("PGUSER", user, 1);
 
        /*
         * However, we *don't* honor PGDATABASE, since we certainly don't wish
         * to connect to whatever database the user might like as default.
         * (Most tests override PGDATABASE anyway, but there are some ECPG
         * test cases that don't.)
         */
        unsetenv("PGDATABASE");
 
        /*
         * Report what we're connecting to
         */
        pghost = getenv("PGHOST");
        pgport = getenv("PGPORT");
        if (!pghost)
        {
            /* Keep this bit in sync with libpq's default host location: */
            if (DEFAULT_PGSOCKET_DIR[0])
                 /* do nothing, we'll print "Unix socket" below */ ;
            else
                pghost = "localhost";   /* DefaultHost in fe-connect.c */
        }
 
        if (pghost && pgport)
            printf(_("(using postmaster on %s, port %s)\n"), pghost, pgport);
        if (pghost && !pgport)
            printf(_("(using postmaster on %s, default port)\n"), pghost);
        if (!pghost && pgport)
            printf(_("(using postmaster on Unix socket, port %s)\n"), pgport);
        if (!pghost && !pgport)
            printf(_("(using postmaster on Unix socket, default port)\n"));
    }
 
    load_resultmap();
}
 
#ifdef ENABLE_SSPI
 
/* support for config_sspi_auth() */
static const char *
fmtHba(const char *raw)
{
    static char *ret;
    const char *rp;
    char       *wp;
 
    wp = ret = pg_realloc(ret, 3 + strlen(raw) * 2);
 
    *wp++ = '"';
    for (rp = raw; *rp; rp++)
    {
        if (*rp == '"')
            *wp++ = '"';
        *wp++ = *rp;
    }
    *wp++ = '"';
    *wp++ = '\0';
 
    return ret;
}
 
/*
 * Get account and domain/realm names for the current user.  This is based on
 * pg_SSPI_recvauth().  The returned strings use static storage.
 */
static void
current_windows_user(const char **acct, const char **dom)
{
    static char accountname[MAXPGPATH];
    static char domainname[MAXPGPATH];
    HANDLE      token;
    TOKEN_USER *tokenuser;
    DWORD       retlen;
    DWORD       accountnamesize = sizeof(accountname);
    DWORD       domainnamesize = sizeof(domainname);
    SID_NAME_USE accountnameuse;
 
    if (!OpenProcessToken(GetCurrentProcess(), TOKEN_READ, &token))
    {
        fprintf(stderr,
                _("%s: could not open process token: error code %lu\n"),
                progname, GetLastError());
        exit(2);
    }
 
    if (!GetTokenInformation(token, TokenUser, NULL, 0, &retlen) && GetLastError() != 122)
    {
        fprintf(stderr,
                _("%s: could not get token information buffer size: error code %lu\n"),
                progname, GetLastError());
        exit(2);
    }
    tokenuser = pg_malloc(retlen);
    if (!GetTokenInformation(token, TokenUser, tokenuser, retlen, &retlen))
    {
        fprintf(stderr,
                _("%s: could not get token information: error code %lu\n"),
                progname, GetLastError());
        exit(2);
    }
 
    if (!LookupAccountSid(NULL, tokenuser->User.Sid, accountname, &accountnamesize,
                          domainname, &domainnamesize, &accountnameuse))
    {
        fprintf(stderr,
                _("%s: could not look up account SID: error code %lu\n"),
                progname, GetLastError());
        exit(2);
    }
 
    free(tokenuser);
 
    *acct = accountname;
    *dom = domainname;
}
 
/*
 * Rewrite pg_hba.conf and pg_ident.conf to use SSPI authentication.  Permit
 * the current OS user to authenticate as the bootstrap superuser and as any
 * user named in a --create-role option.
 *
 * In --config-auth mode, the --user switch can be used to specify the
 * bootstrap superuser's name, otherwise we assume it is the default.
 */
static void
config_sspi_auth(const char *pgdata, const char *superuser_name)
{
    const char *accountname,
               *domainname;
    char       *errstr;
    bool        have_ipv6;
    char        fname[MAXPGPATH];
    int         res;
    FILE       *hba,
               *ident;
    _stringlist *sl;
 
    /* Find out the name of the current OS user */
    current_windows_user(&accountname, &domainname);
 
    /* Determine the bootstrap superuser's name */
    if (superuser_name == NULL)
    {
        /*
         * Compute the default superuser name the same way initdb does.
         *
         * It's possible that this result always matches "accountname", the
         * value SSPI authentication discovers.  But the underlying system
         * functions do not clearly guarantee that.
         */
        superuser_name = get_user_name(&errstr);
        if (superuser_name == NULL)
        {
            fprintf(stderr, "%s: %s\n", progname, errstr);
            exit(2);
        }
    }
 
    /*
     * Like initdb.c:setup_config(), determine whether the platform recognizes
     * ::1 (IPv6 loopback) as a numeric host address string.
     */
    {
        struct addrinfo *gai_result;
        struct addrinfo hints;
        WSADATA     wsaData;
 
        hints.ai_flags = AI_NUMERICHOST;
        hints.ai_family = AF_UNSPEC;
        hints.ai_socktype = 0;
        hints.ai_protocol = 0;
        hints.ai_addrlen = 0;
        hints.ai_canonname = NULL;
        hints.ai_addr = NULL;
        hints.ai_next = NULL;
 
        have_ipv6 = (WSAStartup(MAKEWORD(2, 2), &wsaData) == 0 &&
                     getaddrinfo("::1", NULL, &hints, &gai_result) == 0);
    }
 
    /* Check a Write outcome and report any error. */
#define CW(cond)    \
    do { \
        if (!(cond)) \
        { \
            fprintf(stderr, _("%s: could not write to file \"%s\": %s\n"), \
                    progname, fname, strerror(errno)); \
            exit(2); \
        } \
    } while (0)
 
    res = snprintf(fname, sizeof(fname), "%s/pg_hba.conf", pgdata);
    if (res < 0 || res >= sizeof(fname))
    {
        /*
         * Truncating this name is a fatal error, because we must not fail to
         * overwrite an original trust-authentication pg_hba.conf.
         */
        fprintf(stderr, _("%s: directory name too long\n"), progname);
        exit(2);
    }
    hba = fopen(fname, "w");
    if (hba == NULL)
    {
        fprintf(stderr, _("%s: could not open file \"%s\" for writing: %s\n"),
                progname, fname, strerror(errno));
        exit(2);
    }
    CW(fputs("# Configuration written by config_sspi_auth()\n", hba) >= 0);
    CW(fputs("host all all 127.0.0.1/32  sspi include_realm=1 map=regress\n",
             hba) >= 0);
    if (have_ipv6)
        CW(fputs("host all all ::1/128  sspi include_realm=1 map=regress\n",
                 hba) >= 0);
    CW(fclose(hba) == 0);
 
    snprintf(fname, sizeof(fname), "%s/pg_ident.conf", pgdata);
    ident = fopen(fname, "w");
    if (ident == NULL)
    {
        fprintf(stderr, _("%s: could not open file \"%s\" for writing: %s\n"),
                progname, fname, strerror(errno));
        exit(2);
    }
    CW(fputs("# Configuration written by config_sspi_auth()\n", ident) >= 0);
 
    /*
     * Double-quote for the benefit of account names containing whitespace or
     * '#'.  Windows forbids the double-quote character itself, so don't
     * bother escaping embedded double-quote characters.
     */
    CW(fprintf(ident, "regress  \"%s@%s\"  %s\n",
               accountname, domainname, fmtHba(superuser_name)) >= 0);
    for (sl = extraroles; sl; sl = sl->next)
        CW(fprintf(ident, "regress  \"%s@%s\"  %s\n",
                   accountname, domainname, fmtHba(sl->str)) >= 0);
    CW(fclose(ident) == 0);
}
 
#endif                          /* ENABLE_SSPI */
 
/*
 * psql_start_command, psql_add_command, psql_end_command
 *
 * Issue one or more commands within one psql call.
 * Set up with psql_start_command, then add commands one at a time
 * with psql_add_command, and finally execute with psql_end_command.
 *
 * Since we use system(), this doesn't return until the operation finishes
 */
static StringInfo
psql_start_command(void)
{
    StringInfo  buf = makeStringInfo();
 
    appendStringInfo(buf,
                     "\"%s%spsql\" -X",
                     bindir ? bindir : "",
                     bindir ? "/" : "");
    return buf;
}
 
static void
psql_add_command(StringInfo buf, const char *query,...)
{
    StringInfoData cmdbuf;
    const char *cmdptr;
 
    /* Add each command as a -c argument in the psql call */
    appendStringInfoString(buf, " -c \"");
 
    /* Generate the query with insertion of sprintf arguments */
    initStringInfo(&cmdbuf);
    for (;;)
    {
        va_list     args;
        int         needed;
 
        va_start(args, query);
        needed = appendStringInfoVA(&cmdbuf, query, args);
        va_end(args);
        if (needed == 0)
            break;              /* success */
        enlargeStringInfo(&cmdbuf, needed);
    }
 
    /* Now escape any shell double-quote metacharacters */
    for (cmdptr = cmdbuf.data; *cmdptr; cmdptr++)
    {
        if (strchr("\\\"$`", *cmdptr))
            appendStringInfoChar(buf, '\\');
        appendStringInfoChar(buf, *cmdptr);
    }
 
    appendStringInfoChar(buf, '"');
 
    pfree(cmdbuf.data);
}
 
static void
psql_end_command(StringInfo buf, const char *database)
{
    /* Add the database name --- assume it needs no extra escaping */
    appendStringInfo(buf,
                     " \"%s\"",
                     database);
 
    /* And now we can execute the shell command */
    fflush(NULL);
    if (system(buf->data) != 0)
    {
        /* psql probably already reported the error */
        fprintf(stderr, _("command failed: %s\n"), buf->data);
        exit(2);
    }
 
    /* Clean up */
    pfree(buf->data);
    pfree(buf);
}
 
/*
 * Shorthand macro for the common case of a single command
 */
#define psql_command(database, ...) \
    do { \
        StringInfo cmdbuf = psql_start_command(); \
        psql_add_command(cmdbuf, __VA_ARGS__); \
        psql_end_command(cmdbuf, database); \
    } while (0)
 
/*
 * Spawn a process to execute the given shell command; don't wait for it
 *
 * Returns the process ID (or HANDLE) so we can wait for it later
 */
PID_TYPE
spawn_process(const char *cmdline)
{
#ifndef WIN32
    pid_t       pid;
 
    /*
     * Must flush I/O buffers before fork.
     */
    fflush(NULL);
 
#ifdef EXEC_BACKEND
    pg_disable_aslr();
#endif
 
    pid = fork();
    if (pid == -1)
    {
        fprintf(stderr, _("%s: could not fork: %s\n"),
                progname, strerror(errno));
        exit(2);
    }
    if (pid == 0)
    {
        /*
         * In child
         *
         * Instead of using system(), exec the shell directly, and tell it to
         * "exec" the command too.  This saves two useless processes per
         * parallel test case.
         */
        char       *cmdline2;
 
        cmdline2 = psprintf("exec %s", cmdline);
        execl(shellprog, shellprog, "-c", cmdline2, (char *) NULL);
        fprintf(stderr, _("%s: could not exec \"%s\": %s\n"),
                progname, shellprog, strerror(errno));
        _exit(1);               /* not exit() here... */
    }
    /* in parent */
    return pid;
#else
    PROCESS_INFORMATION pi;
    char       *cmdline2;
    HANDLE      restrictedToken;
    const char *comspec;
 
    /* Find CMD.EXE location using COMSPEC, if it's set */
    comspec = getenv("COMSPEC");
    if (comspec == NULL)
        comspec = "CMD";
 
    memset(&pi, 0, sizeof(pi));
    cmdline2 = psprintf("\"%s\" /c \"%s\"", comspec, cmdline);
 
    if ((restrictedToken =
         CreateRestrictedProcess(cmdline2, &pi)) == 0)
        exit(2);
 
    CloseHandle(pi.hThread);
    return pi.hProcess;
#endif
}
 
/*
 * Count bytes in file
 */
static long
file_size(const char *file)
{
    long        r;
    FILE       *f = fopen(file, "r");
 
    if (!f)
    {
        fprintf(stderr, _("%s: could not open file \"%s\" for reading: %s\n"),
                progname, file, strerror(errno));
        return -1;
    }
    fseek(f, 0, SEEK_END);
    r = ftell(f);
    fclose(f);
    return r;
}
 
/*
 * Count lines in file
 */
static int
file_line_count(const char *file)
{
    int         c;
    int         l = 0;
    FILE       *f = fopen(file, "r");
 
    if (!f)
    {
        fprintf(stderr, _("%s: could not open file \"%s\" for reading: %s\n"),
                progname, file, strerror(errno));
        return -1;
    }
    while ((c = fgetc(f)) != EOF)
    {
        if (c == '\n')
            l++;
    }
    fclose(f);
    return l;
}
 
bool
file_exists(const char *file)
{
    FILE       *f = fopen(file, "r");
 
    if (!f)
        return false;
    fclose(f);
    return true;
}
 
static bool
directory_exists(const char *dir)
{
    struct stat st;
 
    if (stat(dir, &st) != 0)
        return false;
    if (S_ISDIR(st.st_mode))
        return true;
    return false;
}
 
/* Create a directory */
static void
make_directory(const char *dir)
{
    if (mkdir(dir, S_IRWXU | S_IRWXG | S_IRWXO) < 0)
    {
        fprintf(stderr, _("%s: could not create directory \"%s\": %s\n"),
                progname, dir, strerror(errno));
        exit(2);
    }
}
 
/*
 * In: filename.ext, Return: filename_i.ext, where 0 < i <= 9
 */
static char *
get_alternative_expectfile(const char *expectfile, int i)
{
    char       *last_dot;
    int         ssize = strlen(expectfile) + 2 + 1;
    char       *tmp;
    char       *s;
 
    if (!(tmp = (char *) malloc(ssize)))
        return NULL;
 
    if (!(s = (char *) malloc(ssize)))
    {
        free(tmp);
        return NULL;
    }
 
    strcpy(tmp, expectfile);
    last_dot = strrchr(tmp, '.');
    if (!last_dot)
    {
        free(tmp);
        free(s);
        return NULL;
    }
    *last_dot = '\0';
    snprintf(s, ssize, "%s_%d.%s", tmp, i, last_dot + 1);
    free(tmp);
    return s;
}
 
/*
 * Run a "diff" command and also check that it didn't crash
 */
static int
run_diff(const char *cmd, const char *filename)
{
    int         r;
 
    fflush(NULL);
    r = system(cmd);
    if (!WIFEXITED(r) || WEXITSTATUS(r) > 1)
    {
        fprintf(stderr, _("diff command failed with status %d: %s\n"), r, cmd);
        exit(2);
    }
#ifdef WIN32
 
    /*
     * On WIN32, if the 'diff' command cannot be found, system() returns 1,
     * but produces nothing to stdout, so we check for that here.
     */
    if (WEXITSTATUS(r) == 1 && file_size(filename) <= 0)
    {
        fprintf(stderr, _("diff command not found: %s\n"), cmd);
        exit(2);
    }
#endif
 
    return WEXITSTATUS(r);
}
 
/*
 * Check the actual result file for the given test against expected results
 *
 * Returns true if different (failure), false if correct match found.
 * In the true case, the diff is appended to the diffs file.
 */
static bool
results_differ(const char *testname, const char *resultsfile, const char *default_expectfile)
{
    char        expectfile[MAXPGPATH];
    char        diff[MAXPGPATH];
    char        cmd[MAXPGPATH * 3];
    char        best_expect_file[MAXPGPATH];
    FILE       *difffile;
    int         best_line_count;
    int         i;
    int         l;
    const char *platform_expectfile;
 
    /*
     * We can pass either the resultsfile or the expectfile, they should have
     * the same type (filename.type) anyway.
     */
    platform_expectfile = get_expectfile(testname, resultsfile);
 
    strlcpy(expectfile, default_expectfile, sizeof(expectfile));
    if (platform_expectfile)
    {
        /*
         * Replace everything after the last slash in expectfile with what the
         * platform_expectfile contains.
         */
        char       *p = strrchr(expectfile, '/');
 
        if (p)
            strcpy(++p, platform_expectfile);
    }
 
    /* Name to use for temporary diff file */
    snprintf(diff, sizeof(diff), "%s.diff", resultsfile);
 
    /* OK, run the diff */
    snprintf(cmd, sizeof(cmd),
             "diff %s \"%s\" \"%s\" > \"%s\"",
             basic_diff_opts, expectfile, resultsfile, diff);
 
    /* Is the diff file empty? */
    if (run_diff(cmd, diff) == 0)
    {
        unlink(diff);
        return false;
    }
 
    /* There may be secondary comparison files that match better */
    best_line_count = file_line_count(diff);
    strcpy(best_expect_file, expectfile);
 
    for (i = 0; i <= 9; i++)
    {
        char       *alt_expectfile;
 
        alt_expectfile = get_alternative_expectfile(expectfile, i);
        if (!alt_expectfile)
        {
            fprintf(stderr, _("Unable to check secondary comparison files: %s\n"),
                    strerror(errno));
            exit(2);
        }
 
        if (!file_exists(alt_expectfile))
        {
            free(alt_expectfile);
            continue;
        }
 
        snprintf(cmd, sizeof(cmd),
                 "diff %s \"%s\" \"%s\" > \"%s\"",
                 basic_diff_opts, alt_expectfile, resultsfile, diff);
 
        if (run_diff(cmd, diff) == 0)
        {
            unlink(diff);
            free(alt_expectfile);
            return false;
        }
 
        l = file_line_count(diff);
        if (l < best_line_count)
        {
            /* This diff was a better match than the last one */
            best_line_count = l;
            strlcpy(best_expect_file, alt_expectfile, sizeof(best_expect_file));
        }
        free(alt_expectfile);
    }
 
    /*
     * fall back on the canonical results file if we haven't tried it yet and
     * haven't found a complete match yet.
     */
 
    if (platform_expectfile)
    {
        snprintf(cmd, sizeof(cmd),
                 "diff %s \"%s\" \"%s\" > \"%s\"",
                 basic_diff_opts, default_expectfile, resultsfile, diff);
 
        if (run_diff(cmd, diff) == 0)
        {
            /* No diff = no changes = good */
            unlink(diff);
            return false;
        }
 
        l = file_line_count(diff);
        if (l < best_line_count)
        {
            /* This diff was a better match than the last one */
            best_line_count = l;
            strlcpy(best_expect_file, default_expectfile, sizeof(best_expect_file));
        }
    }
 
    /*
     * Use the best comparison file to generate the "pretty" diff, which we
     * append to the diffs summary file.
     */
 
    /* Write diff header */
    difffile = fopen(difffilename, "a");
    if (difffile)
    {
        fprintf(difffile,
                "diff %s %s %s\n",
                pretty_diff_opts, best_expect_file, resultsfile);
        fclose(difffile);
    }
 
    /* Run diff */
    snprintf(cmd, sizeof(cmd),
             "diff %s \"%s\" \"%s\" >> \"%s\"",
             pretty_diff_opts, best_expect_file, resultsfile, difffilename);
    run_diff(cmd, difffilename);
 
    unlink(diff);
    return true;
}
 
/*
 * Wait for specified subprocesses to finish, and return their exit
 * statuses into statuses[] and stop times into stoptimes[]
 *
 * If names isn't NULL, print each subprocess's name as it finishes
 *
 * Note: it's OK to scribble on the pids array, but not on the names array
 */
static void
wait_for_tests(PID_TYPE * pids, int *statuses, instr_time *stoptimes,
               char **names, int num_tests)
{
    int         tests_left;
    int         i;
 
#ifdef WIN32
    PID_TYPE   *active_pids = pg_malloc(num_tests * sizeof(PID_TYPE));
 
    memcpy(active_pids, pids, num_tests * sizeof(PID_TYPE));
#endif
 
    tests_left = num_tests;
    while (tests_left > 0)
    {
        PID_TYPE    p;
 
#ifndef WIN32
        int         exit_status;
 
        p = wait(&exit_status);
 
        if (p == INVALID_PID)
        {
            fprintf(stderr, _("failed to wait for subprocesses: %s\n"),
                    strerror(errno));
            exit(2);
        }
#else
        DWORD       exit_status;
        int         r;
 
        r = WaitForMultipleObjects(tests_left, active_pids, FALSE, INFINITE);
        if (r < WAIT_OBJECT_0 || r >= WAIT_OBJECT_0 + tests_left)
        {
            fprintf(stderr, _("failed to wait for subprocesses: error code %lu\n"),
                    GetLastError());
            exit(2);
        }
        p = active_pids[r - WAIT_OBJECT_0];
        /* compact the active_pids array */
        active_pids[r - WAIT_OBJECT_0] = active_pids[tests_left - 1];
#endif                          /* WIN32 */
 
        for (i = 0; i < num_tests; i++)
        {
            if (p == pids[i])
            {
#ifdef WIN32
                GetExitCodeProcess(pids[i], &exit_status);
                CloseHandle(pids[i]);
#endif
                pids[i] = INVALID_PID;
                statuses[i] = (int) exit_status;
                INSTR_TIME_SET_CURRENT(stoptimes[i]);
                if (names)
                    status(" %s", names[i]);
                tests_left--;
                break;
            }
        }
    }
 
#ifdef WIN32
    free(active_pids);
#endif
}
 
/*
 * report nonzero exit code from a test process
 */
static void
log_child_failure(int exitstatus)
{
    if (WIFEXITED(exitstatus))
        status(_(" (test process exited with exit code %d)"),
               WEXITSTATUS(exitstatus));
    else if (WIFSIGNALED(exitstatus))
    {
#if defined(WIN32)
        status(_(" (test process was terminated by exception 0x%X)"),
               WTERMSIG(exitstatus));
#else
        status(_(" (test process was terminated by signal %d: %s)"),
               WTERMSIG(exitstatus), pg_strsignal(WTERMSIG(exitstatus)));
#endif
    }
    else
        status(_(" (test process exited with unrecognized status %d)"),
               exitstatus);
}
 
/*
 * Run all the tests specified in one schedule file
 */
static void
run_schedule(const char *schedule, test_start_function startfunc,
             postprocess_result_function postfunc)
{
#define MAX_PARALLEL_TESTS 100
    char       *tests[MAX_PARALLEL_TESTS];
    _stringlist *resultfiles[MAX_PARALLEL_TESTS];
    _stringlist *expectfiles[MAX_PARALLEL_TESTS];
    _stringlist *tags[MAX_PARALLEL_TESTS];
    PID_TYPE    pids[MAX_PARALLEL_TESTS];
    instr_time  starttimes[MAX_PARALLEL_TESTS];
    instr_time  stoptimes[MAX_PARALLEL_TESTS];
    int         statuses[MAX_PARALLEL_TESTS];
    char        scbuf[1024];
    FILE       *scf;
    int         line_num = 0;
 
    memset(tests, 0, sizeof(tests));
    memset(resultfiles, 0, sizeof(resultfiles));
    memset(expectfiles, 0, sizeof(expectfiles));
    memset(tags, 0, sizeof(tags));
 
    scf = fopen(schedule, "r");
    if (!scf)
    {
        fprintf(stderr, _("%s: could not open file \"%s\" for reading: %s\n"),
                progname, schedule, strerror(errno));
        exit(2);
    }
 
    while (fgets(scbuf, sizeof(scbuf), scf))
    {
        char       *test = NULL;
        char       *c;
        int         num_tests;
        bool        inword;
        int         i;
 
        line_num++;
 
        /* strip trailing whitespace, especially the newline */
        i = strlen(scbuf);
        while (i > 0 && isspace((unsigned char) scbuf[i - 1]))
            scbuf[--i] = '\0';
 
        if (scbuf[0] == '\0' || scbuf[0] == '#')
            continue;
        if (strncmp(scbuf, "test: ", 6) == 0)
            test = scbuf + 6;
        else
        {
            fprintf(stderr, _("syntax error in schedule file \"%s\" line %d: %s\n"),
                    schedule, line_num, scbuf);
            exit(2);
        }
 
        num_tests = 0;
        inword = false;
        for (c = test;; c++)
        {
            if (*c == '\0' || isspace((unsigned char) *c))
            {
                if (inword)
                {
                    /* Reached end of a test name */
                    char        sav;
 
                    if (num_tests >= MAX_PARALLEL_TESTS)
                    {
                        fprintf(stderr, _("too many parallel tests (more than %d) in schedule file \"%s\" line %d: %s\n"),
                                MAX_PARALLEL_TESTS, schedule, line_num, scbuf);
                        exit(2);
                    }
                    sav = *c;
                    *c = '\0';
                    tests[num_tests] = pg_strdup(test);
                    num_tests++;
                    *c = sav;
                    inword = false;
                }
                if (*c == '\0')
                    break;      /* loop exit is here */
            }
            else if (!inword)
            {
                /* Start of a test name */
                test = c;
                inword = true;
            }
        }
 
        if (num_tests == 0)
        {
            fprintf(stderr, _("syntax error in schedule file \"%s\" line %d: %s\n"),
                    schedule, line_num, scbuf);
            exit(2);
        }
 
        if (num_tests == 1)
        {
            status(_("test %-28s ... "), tests[0]);
            pids[0] = (startfunc) (tests[0], &resultfiles[0], &expectfiles[0], &tags[0]);
            INSTR_TIME_SET_CURRENT(starttimes[0]);
            wait_for_tests(pids, statuses, stoptimes, NULL, 1);
            /* status line is finished below */
        }
        else if (max_concurrent_tests > 0 && max_concurrent_tests < num_tests)
        {
            fprintf(stderr, _("too many parallel tests (more than %d) in schedule file \"%s\" line %d: %s\n"),
                    max_concurrent_tests, schedule, line_num, scbuf);
            exit(2);
        }
        else if (max_connections > 0 && max_connections < num_tests)
        {
            int         oldest = 0;
 
            status(_("parallel group (%d tests, in groups of %d): "),
                   num_tests, max_connections);
            for (i = 0; i < num_tests; i++)
            {
                if (i - oldest >= max_connections)
                {
                    wait_for_tests(pids + oldest, statuses + oldest,
                                   stoptimes + oldest,
                                   tests + oldest, i - oldest);
                    oldest = i;
                }
                pids[i] = (startfunc) (tests[i], &resultfiles[i], &expectfiles[i], &tags[i]);
                INSTR_TIME_SET_CURRENT(starttimes[i]);
            }
            wait_for_tests(pids + oldest, statuses + oldest,
                           stoptimes + oldest,
                           tests + oldest, i - oldest);
            status_end();
        }
        else
        {
            status(_("parallel group (%d tests): "), num_tests);
            for (i = 0; i < num_tests; i++)
            {
                pids[i] = (startfunc) (tests[i], &resultfiles[i], &expectfiles[i], &tags[i]);
                INSTR_TIME_SET_CURRENT(starttimes[i]);
            }
            wait_for_tests(pids, statuses, stoptimes, tests, num_tests);
            status_end();
        }
 
        /* Check results for all tests */
        for (i = 0; i < num_tests; i++)
        {
            _stringlist *rl,
                       *el,
                       *tl;
            bool        differ = false;
 
            if (num_tests > 1)
                status(_("     %-28s ... "), tests[i]);
 
            /*
             * Advance over all three lists simultaneously.
             *
             * Compare resultfiles[j] with expectfiles[j] always. Tags are
             * optional but if there are tags, the tag list has the same
             * length as the other two lists.
             */
            for (rl = resultfiles[i], el = expectfiles[i], tl = tags[i];
                 rl != NULL;    /* rl and el have the same length */
                 rl = rl->next, el = el->next,
                 tl = tl ? tl->next : NULL)
            {
                bool        newdiff;
 
                if (postfunc)
                    (*postfunc) (rl->str);
                newdiff = results_differ(tests[i], rl->str, el->str);
                if (newdiff && tl)
                {
                    printf("%s ", tl->str);
                }
                differ |= newdiff;
            }
 
            if (statuses[i] != 0)
            {
                status(_("FAILED"));
                log_child_failure(statuses[i]);
                fail_count++;
            }
            else
            {
 
                if (differ)
                {
                    status(_("FAILED"));
                    fail_count++;
                }
                else
                {
                    status(_("ok    "));    /* align with FAILED */
                    success_count++;
                }
            }
 
            INSTR_TIME_SUBTRACT(stoptimes[i], starttimes[i]);
            status(_(" %8.0f ms"), INSTR_TIME_GET_MILLISEC(stoptimes[i]));
 
            status_end();
        }
 
        for (i = 0; i < num_tests; i++)
        {
            pg_free(tests[i]);
            tests[i] = NULL;
            free_stringlist(&resultfiles[i]);
            free_stringlist(&expectfiles[i]);
            free_stringlist(&tags[i]);
        }
    }
 
    fclose(scf);
}
 
/*
 * Run a single test
 */
static void
run_single_test(const char *test, test_start_function startfunc,
                postprocess_result_function postfunc)
{
    PID_TYPE    pid;
    instr_time  starttime;
    instr_time  stoptime;
    int         exit_status;
    _stringlist *resultfiles = NULL;
    _stringlist *expectfiles = NULL;
    _stringlist *tags = NULL;
    _stringlist *rl,
               *el,
               *tl;
    bool        differ = false;
 
    status(_("test %-28s ... "), test);
    pid = (startfunc) (test, &resultfiles, &expectfiles, &tags);
    INSTR_TIME_SET_CURRENT(starttime);
    wait_for_tests(&pid, &exit_status, &stoptime, NULL, 1);
 
    /*
     * Advance over all three lists simultaneously.
     *
     * Compare resultfiles[j] with expectfiles[j] always. Tags are optional
     * but if there are tags, the tag list has the same length as the other
     * two lists.
     */
    for (rl = resultfiles, el = expectfiles, tl = tags;
         rl != NULL;            /* rl and el have the same length */
         rl = rl->next, el = el->next,
         tl = tl ? tl->next : NULL)
    {
        bool        newdiff;
 
        if (postfunc)
            (*postfunc) (rl->str);
        newdiff = results_differ(test, rl->str, el->str);
        if (newdiff && tl)
        {
            printf("%s ", tl->str);
        }
        differ |= newdiff;
    }
 
    if (exit_status != 0)
    {
        status(_("FAILED"));
        fail_count++;
        log_child_failure(exit_status);
    }
    else
    {
        if (differ)
        {
            status(_("FAILED"));
            fail_count++;
        }
        else
        {
            status(_("ok    "));    /* align with FAILED */
            success_count++;
        }
    }
 
    INSTR_TIME_SUBTRACT(stoptime, starttime);
    status(_(" %8.0f ms"), INSTR_TIME_GET_MILLISEC(stoptime));
 
    status_end();
}
 
/*
 * Create the summary-output files (making them empty if already existing)
 */
static void
open_result_files(void)
{
    char        file[MAXPGPATH];
    FILE       *difffile;
 
    /* create outputdir directory if not present */
    if (!directory_exists(outputdir))
        make_directory(outputdir);
 
    /* create the log file (copy of running status output) */
    snprintf(file, sizeof(file), "%s/regression.out", outputdir);
    logfilename = pg_strdup(file);
    logfile = fopen(logfilename, "w");
    if (!logfile)
    {
        fprintf(stderr, _("%s: could not open file \"%s\" for writing: %s\n"),
                progname, logfilename, strerror(errno));
        exit(2);
    }
 
    /* create the diffs file as empty */
    snprintf(file, sizeof(file), "%s/regression.diffs", outputdir);
    difffilename = pg_strdup(file);
    difffile = fopen(difffilename, "w");
    if (!difffile)
    {
        fprintf(stderr, _("%s: could not open file \"%s\" for writing: %s\n"),
                progname, difffilename, strerror(errno));
        exit(2);
    }
    /* we don't keep the diffs file open continuously */
    fclose(difffile);
 
    /* also create the results directory if not present */
    snprintf(file, sizeof(file), "%s/results", outputdir);
    if (!directory_exists(file))
        make_directory(file);
}
 
static void
drop_database_if_exists(const char *dbname)
{
    StringInfo  buf = psql_start_command();
 
    header(_("dropping database \"%s\""), dbname);
    /* Set warning level so we don't see chatter about nonexistent DB */
    psql_add_command(buf, "SET client_min_messages = warning");
    psql_add_command(buf, "DROP DATABASE IF EXISTS \"%s\"", dbname);
    psql_end_command(buf, "postgres");
}
 
static void
create_database(const char *dbname)
{
    StringInfo  buf = psql_start_command();
    _stringlist *sl;
 
    /*
     * We use template0 so that any installation-local cruft in template1 will
     * not mess up the tests.
     */
    header(_("creating database \"%s\""), dbname);
    if (encoding)
        psql_add_command(buf, "CREATE DATABASE \"%s\" TEMPLATE=template0 ENCODING='%s'%s", dbname, encoding,
                         (nolocale) ? " LC_COLLATE='C' LC_CTYPE='C'" : "");
    else
        psql_add_command(buf, "CREATE DATABASE \"%s\" TEMPLATE=template0%s", dbname,
                         (nolocale) ? " LC_COLLATE='C' LC_CTYPE='C'" : "");
    psql_add_command(buf,
                     "ALTER DATABASE \"%s\" SET lc_messages TO 'C';"
                     "ALTER DATABASE \"%s\" SET lc_monetary TO 'C';"
                     "ALTER DATABASE \"%s\" SET lc_numeric TO 'C';"
                     "ALTER DATABASE \"%s\" SET lc_time TO 'C';"
                     "ALTER DATABASE \"%s\" SET bytea_output TO 'hex';"
                     "ALTER DATABASE \"%s\" SET timezone_abbreviations TO 'Default';",
                     dbname, dbname, dbname, dbname, dbname, dbname);
    psql_end_command(buf, "postgres");
 
    /*
     * Install any requested extensions.  We use CREATE IF NOT EXISTS so that
     * this will work whether or not the extension is preinstalled.
     */
    for (sl = loadextension; sl != NULL; sl = sl->next)
    {
        header(_("installing %s"), sl->str);
        psql_command(dbname, "CREATE EXTENSION IF NOT EXISTS \"%s\"", sl->str);
    }
}
 
static void
drop_role_if_exists(const char *rolename)
{
    StringInfo  buf = psql_start_command();
 
    header(_("dropping role \"%s\""), rolename);
    /* Set warning level so we don't see chatter about nonexistent role */
    psql_add_command(buf, "SET client_min_messages = warning");
    psql_add_command(buf, "DROP ROLE IF EXISTS \"%s\"", rolename);
    psql_end_command(buf, "postgres");
}
 
static void
create_role(const char *rolename, const _stringlist *granted_dbs)
{
    StringInfo  buf = psql_start_command();
 
    header(_("creating role \"%s\""), rolename);
    psql_add_command(buf, "CREATE ROLE \"%s\" WITH LOGIN", rolename);
    for (; granted_dbs != NULL; granted_dbs = granted_dbs->next)
    {
        psql_add_command(buf, "GRANT ALL ON DATABASE \"%s\" TO \"%s\"",
                         granted_dbs->str, rolename);
    }
    psql_end_command(buf, "postgres");
}
 
static void
help(void)
{
    printf(_("PostgreSQL regression test driver\n"));
    printf(_("\n"));
    printf(_("Usage:\n  %s [OPTION]... [EXTRA-TEST]...\n"), progname);
    printf(_("\n"));
    printf(_("Options:\n"));
    printf(_("      --bindir=BINPATH          use BINPATH for programs that are run;\n"));
    printf(_("                                if empty, use PATH from the environment\n"));
    printf(_("      --config-auth=DATADIR     update authentication settings for DATADIR\n"));
    printf(_("      --create-role=ROLE        create the specified role before testing\n"));
    printf(_("      --dbname=DB               use database DB (default \"regression\")\n"));
    printf(_("      --debug                   turn on debug mode in programs that are run\n"));
    printf(_("      --dlpath=DIR              look for dynamic libraries in DIR\n"));
    printf(_("      --encoding=ENCODING       use ENCODING as the encoding\n"));
    printf(_("      --expecteddir=DIR         take expected files from DIR (default \".\")\n"));
    printf(_("  -h, --help                    show this help, then exit\n"));
    printf(_("      --inputdir=DIR            take input files from DIR (default \".\")\n"));
    printf(_("      --launcher=CMD            use CMD as launcher of psql\n"));
    printf(_("      --load-extension=EXT      load the named extension before running the\n"));
    printf(_("                                tests; can appear multiple times\n"));
    printf(_("      --max-connections=N       maximum number of concurrent connections\n"));
    printf(_("                                (default is 0, meaning unlimited)\n"));
    printf(_("      --max-concurrent-tests=N  maximum number of concurrent tests in schedule\n"));
    printf(_("                                (default is 0, meaning unlimited)\n"));
    printf(_("      --outputdir=DIR           place output files in DIR (default \".\")\n"));
    printf(_("      --schedule=FILE           use test ordering schedule from FILE\n"));
    printf(_("                                (can be used multiple times to concatenate)\n"));
    printf(_("      --temp-instance=DIR       create a temporary instance in DIR\n"));
    printf(_("      --use-existing            use an existing installation\n"));
    printf(_("  -V, --version                 output version information, then exit\n"));
    printf(_("\n"));
    printf(_("Options for \"temp-instance\" mode:\n"));
    printf(_("      --no-locale               use C locale\n"));
    printf(_("      --port=PORT               start postmaster on PORT\n"));
    printf(_("      --temp-config=FILE        append contents of FILE to temporary config\n"));
    printf(_("\n"));
    printf(_("Options for using an existing installation:\n"));
    printf(_("      --host=HOST               use postmaster running on HOST\n"));
    printf(_("      --port=PORT               use postmaster running at PORT\n"));
    printf(_("      --user=USER               connect as USER\n"));
    printf(_("\n"));
    printf(_("The exit status is 0 if all tests passed, 1 if some tests failed, and 2\n"));
    printf(_("if the tests could not be run for some reason.\n"));
    printf(_("\n"));
    printf(_("Report bugs to <%s>.\n"), PACKAGE_BUGREPORT);
    printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
}
 
int
regression_main(int argc, char *argv[],
                init_function ifunc,
                test_start_function startfunc,
                postprocess_result_function postfunc)
{
    static struct option long_options[] = {
        {"help", no_argument, NULL, 'h'},
        {"version", no_argument, NULL, 'V'},
        {"dbname", required_argument, NULL, 1},
        {"debug", no_argument, NULL, 2},
        {"inputdir", required_argument, NULL, 3},
        {"max-connections", required_argument, NULL, 5},
        {"encoding", required_argument, NULL, 6},
        {"outputdir", required_argument, NULL, 7},
        {"schedule", required_argument, NULL, 8},
        {"temp-instance", required_argument, NULL, 9},
        {"no-locale", no_argument, NULL, 10},
        {"host", required_argument, NULL, 13},
        {"port", required_argument, NULL, 14},
        {"user", required_argument, NULL, 15},
        {"bindir", required_argument, NULL, 16},
        {"dlpath", required_argument, NULL, 17},
        {"create-role", required_argument, NULL, 18},
        {"temp-config", required_argument, NULL, 19},
        {"use-existing", no_argument, NULL, 20},
        {"launcher", required_argument, NULL, 21},
        {"load-extension", required_argument, NULL, 22},
        {"config-auth", required_argument, NULL, 24},
        {"max-concurrent-tests", required_argument, NULL, 25},
        {"expecteddir", required_argument, NULL, 26},
        {NULL, 0, NULL, 0}
    };
 
    bool        use_unix_sockets;
    _stringlist *sl;
    int         c;
    int         i;
    int         option_index;
    char        buf[MAXPGPATH * 4];
    char        buf2[MAXPGPATH * 4];
 
    pg_logging_init(argv[0]);
    progname = get_progname(argv[0]);
    set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pg_regress"));
 
    get_restricted_token();
 
    atexit(stop_postmaster);
 
#if defined(WIN32)
 
    /*
     * We don't use Unix-domain sockets on Windows by default (see comment at
     * remove_temp() for a reason).  Override at your own risk.
     */
    use_unix_sockets = getenv("PG_TEST_USE_UNIX_SOCKETS") ? true : false;
#else
    use_unix_sockets = true;
#endif
 
    if (!use_unix_sockets)
        hostname = "localhost";
 
    /*
     * We call the initialization function here because that way we can set
     * default parameters and let them be overwritten by the commandline.
     */
    ifunc(argc, argv);
 
    if (getenv("PG_REGRESS_DIFF_OPTS"))
        pretty_diff_opts = getenv("PG_REGRESS_DIFF_OPTS");
 
    while ((c = getopt_long(argc, argv, "hV", long_options, &option_index)) != -1)
    {
        switch (c)
        {
            case 'h':
                help();
                exit(0);
            case 'V':
                puts("pg_regress (PostgreSQL) " PG_VERSION);
                exit(0);
            case 1:
 
                /*
                 * If a default database was specified, we need to remove it
                 * before we add the specified one.
                 */
                free_stringlist(&dblist);
                split_to_stringlist(optarg, ",", &dblist);
                break;
            case 2:
                debug = true;
                break;
            case 3:
                inputdir = pg_strdup(optarg);
                break;
            case 5:
                max_connections = atoi(optarg);
                break;
            case 6:
                encoding = pg_strdup(optarg);
                break;
            case 7:
                outputdir = pg_strdup(optarg);
                break;
            case 8:
                add_stringlist_item(&schedulelist, optarg);
                break;
            case 9:
                temp_instance = make_absolute_path(optarg);
                break;
            case 10:
                nolocale = true;
                break;
            case 13:
                hostname = pg_strdup(optarg);
                break;
            case 14:
                port = atoi(optarg);
                port_specified_by_user = true;
                break;
            case 15:
                user = pg_strdup(optarg);
                break;
            case 16:
                /* "--bindir=" means to use PATH */
                if (strlen(optarg))
                    bindir = pg_strdup(optarg);
                else
                    bindir = NULL;
                break;
            case 17:
                dlpath = pg_strdup(optarg);
                break;
            case 18:
                split_to_stringlist(optarg, ",", &extraroles);
                break;
            case 19:
                add_stringlist_item(&temp_configs, optarg);
                break;
            case 20:
                use_existing = true;
                break;
            case 21:
                launcher = pg_strdup(optarg);
                break;
            case 22:
                add_stringlist_item(&loadextension, optarg);
                break;
            case 24:
                config_auth_datadir = pg_strdup(optarg);
                break;
            case 25:
                max_concurrent_tests = atoi(optarg);
                break;
            case 26:
                expecteddir = pg_strdup(optarg);
                break;
            default:
                /* getopt_long already emitted a complaint */
                fprintf(stderr, _("\nTry \"%s -h\" for more information.\n"),
                        progname);
                exit(2);
        }
    }
 
    /*
     * if we still have arguments, they are extra tests to run
     */
    while (argc - optind >= 1)
    {
        add_stringlist_item(&extra_tests, argv[optind]);
        optind++;
    }
 
    /*
     * We must have a database to run the tests in; either a default name, or
     * one supplied by the --dbname switch.
     */
    if (!(dblist && dblist->str && dblist->str[0]))
    {
        fprintf(stderr, _("%s: no database name was specified\n"),
                progname);
        exit(2);
    }
 
    if (config_auth_datadir)
    {
#ifdef ENABLE_SSPI
        if (!use_unix_sockets)
            config_sspi_auth(config_auth_datadir, user);
#endif
        exit(0);
    }
 
    if (temp_instance && !port_specified_by_user)
 
        /*
         * To reduce chances of interference with parallel installations, use
         * a port number starting in the private range (49152-65535)
         * calculated from the version number.  This aids non-Unix socket mode
         * systems; elsewhere, the use of a private socket directory already
         * prevents interference.
         */
        port = 0xC000 | (PG_VERSION_NUM & 0x3FFF);
 
    inputdir = make_absolute_path(inputdir);
    outputdir = make_absolute_path(outputdir);
    expecteddir = make_absolute_path(expecteddir);
    dlpath = make_absolute_path(dlpath);
 
    /*
     * Initialization
     */
    open_result_files();
 
    initialize_environment();
 
#if defined(HAVE_GETRLIMIT)
    unlimit_core_size();
#endif
 
    if (temp_instance)
    {
        FILE       *pg_conf;
        const char *env_wait;
        int         wait_seconds;
 
        /*
         * Prepare the temp instance
         */
 
        if (directory_exists(temp_instance))
        {
            header(_("removing existing temp instance"));
            if (!rmtree(temp_instance, true))
            {
                fprintf(stderr, _("\n%s: could not remove temp instance \"%s\"\n"),
                        progname, temp_instance);
                exit(2);
            }
        }
 
        header(_("creating temporary instance"));
 
        /* make the temp instance top directory */
        make_directory(temp_instance);
 
        /* and a directory for log files */
        snprintf(buf, sizeof(buf), "%s/log", outputdir);
        if (!directory_exists(buf))
            make_directory(buf);
 
        /* initdb */
        header(_("initializing database system"));
        snprintf(buf, sizeof(buf),
                 "\"%s%sinitdb\" -D \"%s/data\" --no-clean --no-sync%s%s > \"%s/log/initdb.log\" 2>&1",
                 bindir ? bindir : "",
                 bindir ? "/" : "",
                 temp_instance,
                 debug ? " --debug" : "",
                 nolocale ? " --no-locale" : "",
                 outputdir);
        fflush(NULL);
        if (system(buf))
        {
            fprintf(stderr, _("\n%s: initdb failed\nExamine %s/log/initdb.log for the reason.\nCommand was: %s\n"), progname, outputdir, buf);
            exit(2);
        }
 
        /*
         * Adjust the default postgresql.conf for regression testing. The user
         * can specify a file to be appended; in any case we expand logging
         * and set max_prepared_transactions to enable testing of prepared
         * xacts.  (Note: to reduce the probability of unexpected shmmax
         * failures, don't set max_prepared_transactions any higher than
         * actually needed by the prepared_xacts regression test.)
         */
        snprintf(buf, sizeof(buf), "%s/data/postgresql.conf", temp_instance);
        pg_conf = fopen(buf, "a");
        if (pg_conf == NULL)
        {
            fprintf(stderr, _("\n%s: could not open \"%s\" for adding extra config: %s\n"), progname, buf, strerror(errno));
            exit(2);
        }
        fputs("\n# Configuration added by pg_regress\n\n", pg_conf);
        fputs("log_autovacuum_min_duration = 0\n", pg_conf);
        fputs("log_checkpoints = on\n", pg_conf);
        fputs("log_line_prefix = '%m %b[%p] %q%a '\n", pg_conf);
        fputs("log_lock_waits = on\n", pg_conf);
        fputs("log_temp_files = 128kB\n", pg_conf);
        fputs("max_prepared_transactions = 2\n", pg_conf);
 
        for (sl = temp_configs; sl != NULL; sl = sl->next)
        {
            char       *temp_config = sl->str;
            FILE       *extra_conf;
            char        line_buf[1024];
 
            extra_conf = fopen(temp_config, "r");
            if (extra_conf == NULL)
            {
                fprintf(stderr, _("\n%s: could not open \"%s\" to read extra config: %s\n"), progname, temp_config, strerror(errno));
                exit(2);
            }
            while (fgets(line_buf, sizeof(line_buf), extra_conf) != NULL)
                fputs(line_buf, pg_conf);
            fclose(extra_conf);
        }
 
        fclose(pg_conf);
 
#ifdef ENABLE_SSPI
        if (!use_unix_sockets)
        {
            /*
             * Since we successfully used the same buffer for the much-longer
             * "initdb" command, this can't truncate.
             */
            snprintf(buf, sizeof(buf), "%s/data", temp_instance);
            config_sspi_auth(buf, NULL);
        }
#endif
 
        /*
         * Check if there is a postmaster running already.
         */
        snprintf(buf2, sizeof(buf2),
                 "\"%s%spsql\" -X postgres <%s 2>%s",
                 bindir ? bindir : "",
                 bindir ? "/" : "",
                 DEVNULL, DEVNULL);
 
        for (i = 0; i < 16; i++)
        {
            fflush(NULL);
            if (system(buf2) == 0)
            {
                char        s[16];
 
                if (port_specified_by_user || i == 15)
                {
                    fprintf(stderr, _("port %d apparently in use\n"), port);
                    if (!port_specified_by_user)
                        fprintf(stderr, _("%s: could not determine an available port\n"), progname);
                    fprintf(stderr, _("Specify an unused port using the --port option or shut down any conflicting PostgreSQL servers.\n"));
                    exit(2);
                }
 
                fprintf(stderr, _("port %d apparently in use, trying %d\n"), port, port + 1);
                port++;
                sprintf(s, "%d", port);
                setenv("PGPORT", s, 1);
            }
            else
                break;
        }
 
        /*
         * Start the temp postmaster
         */
        header(_("starting postmaster"));
        snprintf(buf, sizeof(buf),
                 "\"%s%spostgres\" -D \"%s/data\" -F%s "
                 "-c \"listen_addresses=%s\" -k \"%s\" "
                 "> \"%s/log/postmaster.log\" 2>&1",
                 bindir ? bindir : "",
                 bindir ? "/" : "",
                 temp_instance, debug ? " -d 5" : "",
                 hostname ? hostname : "", sockdir ? sockdir : "",
                 outputdir);
        postmaster_pid = spawn_process(buf);
        if (postmaster_pid == INVALID_PID)
        {
            fprintf(stderr, _("\n%s: could not spawn postmaster: %s\n"),
                    progname, strerror(errno));
            exit(2);
        }
 
        /*
         * Wait till postmaster is able to accept connections; normally this
         * is only a second or so, but Cygwin is reportedly *much* slower, and
         * test builds using Valgrind or similar tools might be too.  Hence,
         * allow the default timeout of 60 seconds to be overridden from the
         * PGCTLTIMEOUT environment variable.
         */
        env_wait = getenv("PGCTLTIMEOUT");
        if (env_wait != NULL)
        {
            wait_seconds = atoi(env_wait);
            if (wait_seconds <= 0)
                wait_seconds = 60;
        }
        else
            wait_seconds = 60;
 
        for (i = 0; i < wait_seconds; i++)
        {
            /* Done if psql succeeds */
            fflush(NULL);
            if (system(buf2) == 0)
                break;
 
            /*
             * Fail immediately if postmaster has exited
             */
#ifndef WIN32
            if (waitpid(postmaster_pid, NULL, WNOHANG) == postmaster_pid)
#else
            if (WaitForSingleObject(postmaster_pid, 0) == WAIT_OBJECT_0)
#endif
            {
                fprintf(stderr, _("\n%s: postmaster failed\nExamine %s/log/postmaster.log for the reason\n"), progname, outputdir);
                exit(2);
            }
 
            pg_usleep(1000000L);
        }
        if (i >= wait_seconds)
        {
            fprintf(stderr, _("\n%s: postmaster did not respond within %d seconds\nExamine %s/log/postmaster.log for the reason\n"),
                    progname, wait_seconds, outputdir);
 
            /*
             * If we get here, the postmaster is probably wedged somewhere in
             * startup.  Try to kill it ungracefully rather than leaving a
             * stuck postmaster that might interfere with subsequent test
             * attempts.
             */
#ifndef WIN32
            if (kill(postmaster_pid, SIGKILL) != 0 &&
                errno != ESRCH)
                fprintf(stderr, _("\n%s: could not kill failed postmaster: %s\n"),
                        progname, strerror(errno));
#else
            if (TerminateProcess(postmaster_pid, 255) == 0)
                fprintf(stderr, _("\n%s: could not kill failed postmaster: error code %lu\n"),
                        progname, GetLastError());
#endif
 
            exit(2);
        }
 
        postmaster_running = true;
 
#ifdef _WIN64
/* need a series of two casts to convert HANDLE without compiler warning */
#define ULONGPID(x) (unsigned long) (unsigned long long) (x)
#else
#define ULONGPID(x) (unsigned long) (x)
#endif
        printf(_("running on port %d with PID %lu\n"),
               port, ULONGPID(postmaster_pid));
    }
    else
    {
        /*
         * Using an existing installation, so may need to get rid of
         * pre-existing database(s) and role(s)
         */
        if (!use_existing)
        {
            for (sl = dblist; sl; sl = sl->next)
                drop_database_if_exists(sl->str);
            for (sl = extraroles; sl; sl = sl->next)
                drop_role_if_exists(sl->str);
        }
    }
 
    /*
     * Create the test database(s) and role(s)
     */
    if (!use_existing)
    {
        for (sl = dblist; sl; sl = sl->next)
            create_database(sl->str);
        for (sl = extraroles; sl; sl = sl->next)
            create_role(sl->str, dblist);
    }
 
    /*
     * Ready to run the tests
     */
    header(_("running regression test queries"));
 
    for (sl = schedulelist; sl != NULL; sl = sl->next)
    {
        run_schedule(sl->str, startfunc, postfunc);
    }
 
    for (sl = extra_tests; sl != NULL; sl = sl->next)
    {
        run_single_test(sl->str, startfunc, postfunc);
    }
 
    /*
     * Shut down temp installation's postmaster
     */
    if (temp_instance)
    {
        header(_("shutting down postmaster"));
        stop_postmaster();
    }
 
    /*
     * If there were no errors, remove the temp instance immediately to
     * conserve disk space.  (If there were errors, we leave the instance in
     * place for possible manual investigation.)
     */
    if (temp_instance && fail_count == 0)
    {
        header(_("removing temporary instance"));
        if (!rmtree(temp_instance, true))
            fprintf(stderr, _("\n%s: could not remove temp instance \"%s\"\n"),
                    progname, temp_instance);
    }
 
    fclose(logfile);
 
    /*
     * Emit nice-looking summary message
     */
    if (fail_count == 0)
        snprintf(buf, sizeof(buf),
                 _(" All %d tests passed. "),
                 success_count);
    else
        snprintf(buf, sizeof(buf),
                 _(" %d of %d tests failed. "),
                 fail_count,
                 success_count + fail_count);
 
    putchar('\n');
    for (i = strlen(buf); i > 0; i--)
        putchar('=');
    printf("\n%s\n", buf);
    for (i = strlen(buf); i > 0; i--)
        putchar('=');
    putchar('\n');
    putchar('\n');
 
    if (file_size(difffilename) > 0)
    {
        printf(_("The differences that caused some tests to fail can be viewed in the\n"
                 "file \"%s\".  A copy of the test summary that you see\n"
                 "above is saved in the file \"%s\".\n\n"),
               difffilename, logfilename);
    }
    else
    {
        unlink(difffilename);
        unlink(logfilename);
    }
 
    if (fail_count != 0)
        exit(1);
 
    return 0;
}