common.c File Reference

#include "postgres_fe.h"
#include <signal.h>
#include <unistd.h>
#include "common.h"

Include dependency graph for common.c:

Go to the source code of this file.

Macros
#define	PG_YESLETTER   gettext_noop("y")
#define	PG_NOLETTER   gettext_noop("n")

Functions
void	handle_help_version_opts (int argc, char *argv[], const char *fixed_progname, help_handler hlp)
PGconn *	connectDatabase (const char *dbname, const char *pghost, const char *pgport, const char *pguser, enum trivalue prompt_password, const char *progname, bool fail_ok, bool allow_password_reuse)
PGconn *	connectMaintenanceDatabase (const char *maintenance_db, const char *pghost, const char *pgport, const char *pguser, enum trivalue prompt_password, const char *progname)
PGresult *	executeQuery (PGconn *conn, const char *query, const char *progname, bool echo)
void	executeCommand (PGconn *conn, const char *query, const char *progname, bool echo)
bool	executeMaintenanceCommand (PGconn *conn, const char *query, bool echo)
bool	yesno_prompt (const char *question)
void	SetCancelConn (PGconn *conn)
void	ResetCancelConn (void)
static void	handle_sigint (SIGNAL_ARGS)
void	setup_cancel_handler (void)

Variables
static PGcancel *volatile	cancelConn = NULL
bool	CancelRequested = false

Macro Definition Documentation

#define PG_NOLETTER   gettext_noop("n")

Definition at line 262 of file common.c.

Referenced by yesno_prompt().

#define PG_YESLETTER   gettext_noop("y")

Definition at line 260 of file common.c.

Referenced by yesno_prompt().

Function Documentation

PGconn* connectDatabase	(	const char *	dbname,
		const char *	pghost,
		const char *	pgport,
		const char *	pguser,
		enum trivalue	prompt_password,
		const char *	progname,
		bool	fail_ok,
		bool	allow_password_reuse
	)

Definition at line 66 of file common.c.

References _, conn, CONNECTION_BAD, dbname, have_password, NULL, password, pghost, pgport, PQconnectdbParams(), PQconnectionNeedsPassword(), PQerrorMessage(), PQfinish(), PQstatus(), progname, simple_prompt(), TRI_NO, TRI_YES, and values.

Referenced by connectMaintenanceDatabase().

{
    PGconn     *conn;
    bool        new_pass;
    static bool have_password = false;
    static char password[100];

    if (!allow_password_reuse)
        have_password = false;

    if (!have_password && prompt_password == TRI_YES)
    {
        simple_prompt("Password: ", password, sizeof(password), false);
        have_password = true;
    }

    /*
     * Start the connection.  Loop until we have a password if requested by
     * backend.
     */
    do
    {
        const char *keywords[7];
        const char *values[7];

        keywords[0] = "host";
        values[0] = pghost;
        keywords[1] = "port";
        values[1] = pgport;
        keywords[2] = "user";
        values[2] = pguser;
        keywords[3] = "password";
        values[3] = have_password ? password : NULL;
        keywords[4] = "dbname";
        values[4] = dbname;
        keywords[5] = "fallback_application_name";
        values[5] = progname;
        keywords[6] = NULL;
        values[6] = NULL;

        new_pass = false;
        conn = PQconnectdbParams(keywords, values, true);

        if (!conn)
        {
            fprintf(stderr, _("%s: could not connect to database %s: out of memory\n"),
                    progname, dbname);
            exit(1);
        }

        /*
         * No luck?  Trying asking (again) for a password.
         */
        if (PQstatus(conn) == CONNECTION_BAD &&
            PQconnectionNeedsPassword(conn) &&
            prompt_password != TRI_NO)
        {
            PQfinish(conn);
            simple_prompt("Password: ", password, sizeof(password), false);
            have_password = true;
            new_pass = true;
        }
    } while (new_pass);

    /* check to see that the backend connection was successfully made */
    if (PQstatus(conn) == CONNECTION_BAD)
    {
        if (fail_ok)
        {
            PQfinish(conn);
            return NULL;
        }
        fprintf(stderr, _("%s: could not connect to database %s: %s"),
                progname, dbname, PQerrorMessage(conn));
        exit(1);
    }

    return conn;
}

PGconn* connectMaintenanceDatabase	(	const char *	maintenance_db,
		const char *	pghost,
		const char *	pgport,
		const char *	pguser,
		enum trivalue	prompt_password,
		const char *	progname
	)

Definition at line 152 of file common.c.

References conn, and connectDatabase().

Referenced by cluster_all_databases(), main(), reindex_all_databases(), and vacuum_all_databases().

{
    PGconn     *conn;

    /* If a maintenance database name was specified, just connect to it. */
    if (maintenance_db)
        return connectDatabase(maintenance_db, pghost, pgport, pguser,
                               prompt_password, progname, false, false);

    /* Otherwise, try postgres first and then template1. */
    conn = connectDatabase("postgres", pghost, pgport, pguser, prompt_password,
                           progname, true, false);
    if (!conn)
        conn = connectDatabase("template1", pghost, pgport, pguser,
                               prompt_password, progname, false, false);

    return conn;
}

void executeCommand	(	PGconn *	conn,
		const char *	query,
		const char *	progname,
		bool	echo
	)

Definition at line 205 of file common.c.

References _, PGRES_COMMAND_OK, PQclear(), PQerrorMessage(), PQexec(), PQfinish(), and PQresultStatus().

{
    PGresult   *res;

    if (echo)
        printf("%s\n", query);

    res = PQexec(conn, query);
    if (!res ||
        PQresultStatus(res) != PGRES_COMMAND_OK)
    {
        fprintf(stderr, _("%s: query failed: %s"),
                progname, PQerrorMessage(conn));
        fprintf(stderr, _("%s: query was: %s\n"),
                progname, query);
        PQfinish(conn);
        exit(1);
    }

    PQclear(res);
}

bool executeMaintenanceCommand	(	PGconn *	conn,
		const char *	query,
		bool	echo
	)

Definition at line 235 of file common.c.

References PGRES_COMMAND_OK, PQclear(), PQexec(), PQresultStatus(), ResetCancelConn(), and SetCancelConn().

Referenced by cluster_one_database(), reindex_one_database(), reindex_system_catalogs(), and run_vacuum_command().

{
    PGresult   *res;
    bool        r;

    if (echo)
        printf("%s\n", query);

    SetCancelConn(conn);
    res = PQexec(conn, query);
    ResetCancelConn();

    r = (res && PQresultStatus(res) == PGRES_COMMAND_OK);

    if (res)
        PQclear(res);

    return r;
}

PGresult* executeQuery	(	PGconn *	conn,
		const char *	query,
		const char *	progname,
		bool	echo
	)

Definition at line 178 of file common.c.

References _, PGRES_TUPLES_OK, PQerrorMessage(), PQexec(), PQfinish(), and PQresultStatus().

{
    PGresult   *res;

    if (echo)
        printf("%s\n", query);

    res = PQexec(conn, query);
    if (!res ||
        PQresultStatus(res) != PGRES_TUPLES_OK)
    {
        fprintf(stderr, _("%s: query failed: %s"),
                progname, PQerrorMessage(conn));
        fprintf(stderr, _("%s: query was: %s\n"),
                progname, query);
        PQfinish(conn);
        exit(1);
    }

    return res;
}

void handle_help_version_opts	(	int	argc,
		char *	argv[],
		const char *	fixed_progname,
		help_handler	hlp
	)

Definition at line 35 of file common.c.

References get_progname().

Referenced by main().

{
    if (argc > 1)
    {
        if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
        {
            hlp(get_progname(argv[0]));
            exit(0);
        }
        if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
        {
            printf("%s (PostgreSQL) " PG_VERSION "\n", fixed_progname);
            exit(0);
        }
    }
}

static void handle_sigint ( SIGNAL_ARGS  )

static

Definition at line 354 of file common.c.

References _, CancelRequested, NULL, and PQcancel().

Referenced by setup_cancel_handler().

{
    int         save_errno = errno;
    char        errbuf[256];

    /* Send QueryCancel if we are processing a database query */
    if (cancelConn != NULL)
    {
        if (PQcancel(cancelConn, errbuf, sizeof(errbuf)))
        {
            CancelRequested = true;
            fprintf(stderr, _("Cancel request sent\n"));
        }
        else
            fprintf(stderr, _("Could not send cancel request: %s"), errbuf);
    }
    else
        CancelRequested = true;

    errno = save_errno;         /* just in case the write changed it */
}

void ResetCancelConn

(

void

)

Definition at line 327 of file common.c.

References cancelConn, NULL, and PQfreeCancel().

{
    PGcancel   *oldCancelConn;

#ifdef WIN32
    EnterCriticalSection(&cancelConnLock);
#endif

    oldCancelConn = cancelConn;

    /* be sure handle_sigint doesn't use pointer while freeing */
    cancelConn = NULL;

    if (oldCancelConn != NULL)
        PQfreeCancel(oldCancelConn);

#ifdef WIN32
    LeaveCriticalSection(&cancelConnLock);
#endif
}

void SetCancelConn

(

PGconn *

conn

)

Definition at line 297 of file common.c.

References cancelConn, NULL, PQfreeCancel(), and PQgetCancel().

{
    PGcancel   *oldCancelConn;

#ifdef WIN32
    EnterCriticalSection(&cancelConnLock);
#endif

    /* Free the old one if we have one */
    oldCancelConn = cancelConn;

    /* be sure handle_sigint doesn't use pointer while freeing */
    cancelConn = NULL;

    if (oldCancelConn != NULL)
        PQfreeCancel(oldCancelConn);

    cancelConn = PQgetCancel(conn);

#ifdef WIN32
    LeaveCriticalSection(&cancelConnLock);
#endif
}

void setup_cancel_handler

(

void

)

Definition at line 377 of file common.c.

References handle_sigint(), and pqsignal().

{
    pqsignal(SIGINT, handle_sigint);
}

bool yesno_prompt

(

const char *

question

)

Definition at line 265 of file common.c.

References _, PG_NOLETTER, PG_YESLETTER, simple_prompt(), and snprintf().

Referenced by main().

{
    char        prompt[256];

    /*------
       translator: This is a question followed by the translated options for
       "yes" and "no". */
    snprintf(prompt, sizeof(prompt), _("%s (%s/%s) "),
             _(question), _(PG_YESLETTER), _(PG_NOLETTER));

    for (;;)
    {
        char        resp[10];

        simple_prompt(prompt, resp, sizeof(resp), true);

        if (strcmp(resp, _(PG_YESLETTER)) == 0)
            return true;
        if (strcmp(resp, _(PG_NOLETTER)) == 0)
            return false;

        printf(_("Please answer \"%s\" or \"%s\".\n"),
               _(PG_YESLETTER), _(PG_NOLETTER));
    }
}

Variable Documentation

PGcancel* volatile cancelConn = NULL

static

Definition at line 23 of file common.c.

Referenced by ResetCancelConn(), and SetCancelConn().

bool CancelRequested = false

Definition at line 24 of file common.c.

Referenced by handle_sigint(), select_loop(), and vacuum_one_database().