ps_status.h File Reference

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Go to the source code of this file.

Macros
#define	DEFAULT_UPDATE_PROCESS_TITLE   true

Functions
char **	save_ps_display_args (int argc, char **argv)
void	init_ps_display (const char *fixed_part)
void	set_ps_display_suffix (const char *suffix)
void	set_ps_display_remove_suffix (void)
void	set_ps_display_with_len (const char *activity, size_t len)
static void	set_ps_display (const char *activity)
const char *	get_ps_display (int *displen)

Variables
PGDLLIMPORT bool	update_process_title

Macro Definition Documentation

DEFAULT_UPDATE_PROCESS_TITLE

#define DEFAULT_UPDATE_PROCESS_TITLE   true

Definition at line 19 of file ps_status.h.

Function Documentation

get_ps_display()

const char * get_ps_display

(

int *

displen

)

Definition at line 532 of file ps_status.c.

{
#ifdef PS_USE_CLOBBER_ARGV
    /* If ps_buffer is a pointer, it might still be null */
    if (!ps_buffer)
    {
        *displen = 0;
        return "";
    }
#endif
 
#ifndef PS_USE_NONE
    *displen = (int) (ps_buffer_cur_len - ps_buffer_fixed_size);
 
    return ps_buffer + ps_buffer_fixed_size;
#else
    *displen = 0;
    return "";
#endif
}

Referenced by log_status_format(), write_csvlog(), and write_jsonlog().

init_ps_display()

void init_ps_display

(

const char *

fixed_part

)

Definition at line 269 of file ps_status.c.

{
#ifndef PS_USE_NONE
    bool        save_update_process_title;
#endif
 
    Assert(fixed_part || MyBackendType);
    if (!fixed_part)
        fixed_part = GetBackendTypeDesc(MyBackendType);
 
#ifndef PS_USE_NONE
    /* no ps display for stand-alone backend */
    if (!IsUnderPostmaster)
        return;
 
    /* no ps display if you didn't call save_ps_display_args() */
    if (!save_argv)
        return;
 
#ifdef PS_USE_CLOBBER_ARGV
    /* If ps_buffer is a pointer, it might still be null */
    if (!ps_buffer)
        return;
 
    /* make extra argv slots point at end_of_area (a NUL) */
    for (int i = 1; i < save_argc; i++)
        save_argv[i] = ps_buffer + ps_buffer_size;
#endif                          /* PS_USE_CLOBBER_ARGV */
 
    /*
     * Make fixed prefix of ps display.
     */
 
#if defined(PS_USE_SETPROCTITLE) || defined(PS_USE_SETPROCTITLE_FAST)
 
    /*
     * apparently setproctitle() already adds a `progname:' prefix to the ps
     * line
     */
#define PROGRAM_NAME_PREFIX ""
#else
#define PROGRAM_NAME_PREFIX "postgres: "
#endif
 
    if (*cluster_name == '\0')
    {
        snprintf(ps_buffer, ps_buffer_size,
                 PROGRAM_NAME_PREFIX "%s ",
                 fixed_part);
    }
    else
    {
        snprintf(ps_buffer, ps_buffer_size,
                 PROGRAM_NAME_PREFIX "%s: %s ",
                 cluster_name, fixed_part);
    }
 
    ps_buffer_cur_len = ps_buffer_fixed_size = strlen(ps_buffer);
 
    /*
     * On the first run, force the update.
     */
    save_update_process_title = update_process_title;
    update_process_title = true;
    set_ps_display("");
    update_process_title = save_update_process_title;
#endif                          /* not PS_USE_NONE */
}

References Assert(), cluster_name, GetBackendTypeDesc(), i, IsUnderPostmaster, MyBackendType, save_argc, save_argv, set_ps_display(), snprintf, and update_process_title.

Referenced by AutoVacLauncherMain(), AutoVacWorkerMain(), AuxiliaryProcessMainCommon(), BackendInitialize(), BackgroundWorkerMain(), ReplSlotSyncWorkerMain(), and SysLoggerMain().

save_ps_display_args()

char ** save_ps_display_args	(	int	argc,
		char **	argv
	)

Definition at line 119 of file ps_status.c.

{
    save_argc = argc;
    save_argv = argv;
 
#if defined(PS_USE_CLOBBER_ARGV)
 
    /*
     * If we're going to overwrite the argv area, count the available space.
     * Also move the environment strings to make additional room.
     */
    {
        char       *end_of_area = NULL;
        char      **new_environ;
        int         i;
 
        /*
         * check for contiguous argv strings
         */
        for (i = 0; i < argc; i++)
        {
            if (i == 0 || end_of_area + 1 == argv[i])
                end_of_area = argv[i] + strlen(argv[i]);
        }
 
        if (end_of_area == NULL)    /* probably can't happen? */
        {
            ps_buffer = NULL;
            ps_buffer_size = 0;
            return argv;
        }
 
        /*
         * check for contiguous environ strings following argv
         */
        for (i = 0; environ[i] != NULL; i++)
        {
            if (end_of_area + 1 == environ[i])
            {
                /*
                 * The musl dynamic linker keeps a static pointer to the
                 * initial value of LD_LIBRARY_PATH, if that is defined in the
                 * process's environment. Therefore, we must not overwrite the
                 * value of that setting and thus cannot advance end_of_area
                 * beyond it.  Musl does not define any identifying compiler
                 * symbol, so we have to do this unless we see a symbol
                 * identifying a Linux libc we know is safe.
                 */
#if defined(__linux__) && (!defined(__GLIBC__) && !defined(__UCLIBC__))
                if (strncmp(environ[i], "LD_LIBRARY_PATH=", 16) == 0)
                {
                    /*
                     * We can overwrite the name, but stop at the equals sign.
                     * Future loop iterations will not find any more
                     * contiguous space, but we don't break early because we
                     * need to count the total number of environ[] entries.
                     */
                    end_of_area = environ[i] + 15;
                }
                else
#endif
                {
                    end_of_area = environ[i] + strlen(environ[i]);
                }
            }
        }
 
        ps_buffer = argv[0];
        last_status_len = ps_buffer_size = end_of_area - argv[0];
 
        /*
         * move the environment out of the way
         */
        new_environ = (char **) malloc((i + 1) * sizeof(char *));
        if (!new_environ)
        {
            write_stderr("out of memory\n");
            exit(1);
        }
        for (i = 0; environ[i] != NULL; i++)
        {
            new_environ[i] = strdup(environ[i]);
            if (!new_environ[i])
            {
                write_stderr("out of memory\n");
                exit(1);
            }
        }
        new_environ[i] = NULL;
        environ = new_environ;
    }
 
    /*
     * If we're going to change the original argv[] then make a copy for
     * argument parsing purposes.
     *
     * NB: do NOT think to remove the copying of argv[], even though
     * postmaster.c finishes looking at argv[] long before we ever consider
     * changing the ps display.  On some platforms, getopt() keeps pointers
     * into the argv array, and will get horribly confused when it is
     * re-called to analyze a subprocess' argument string if the argv storage
     * has been clobbered meanwhile.  Other platforms have other dependencies
     * on argv[].
     */
    {
        char      **new_argv;
        int         i;
 
        new_argv = (char **) malloc((argc + 1) * sizeof(char *));
        if (!new_argv)
        {
            write_stderr("out of memory\n");
            exit(1);
        }
        for (i = 0; i < argc; i++)
        {
            new_argv[i] = strdup(argv[i]);
            if (!new_argv[i])
            {
                write_stderr("out of memory\n");
                exit(1);
            }
        }
        new_argv[argc] = NULL;
 
#if defined(__darwin__)
 
        /*
         * macOS has a static copy of the argv pointer, which we may fix like
         * so:
         */
        *_NSGetArgv() = new_argv;
#endif
 
        argv = new_argv;
    }
#endif                          /* PS_USE_CLOBBER_ARGV */
 
    return argv;
}

References environ, i, malloc, save_argc, save_argv, and write_stderr.

Referenced by main().

set_ps_display()

static void set_ps_display ( const char *  activity )

inlinestatic

Definition at line 40 of file ps_status.h.

{
    set_ps_display_with_len(activity, strlen(activity));
}

References set_ps_display_with_len().

Referenced by AutoVacWorkerMain(), BackendInitialize(), exec_bind_message(), exec_parse_message(), exec_replication_command(), init_ps_display(), IoWorkerMain(), PerformAuthentication(), pgarch_archiveXlog(), PostgresMain(), ProcessIncomingNotify(), SendBaseBackup(), StartupXLOG(), update_checkpoint_display(), WalRcvWaitForStartPosition(), XLogFileRead(), XLogSendPhysical(), and XLogWalRcvFlush().

set_ps_display_remove_suffix()

void set_ps_display_remove_suffix

(

void

)

Definition at line 423 of file ps_status.c.

{
#ifndef PS_USE_NONE
    /* first, check if we need to update the process title */
    if (!update_ps_display_precheck())
        return;
 
    /* check we added a suffix */
    if (ps_buffer_nosuffix_len == 0)
        return;                 /* no suffix */
 
    /* remove the suffix from ps_buffer */
    ps_buffer[ps_buffer_nosuffix_len] = '\0';
    ps_buffer_cur_len = ps_buffer_nosuffix_len;
    ps_buffer_nosuffix_len = 0;
 
    Assert(ps_buffer_cur_len == strlen(ps_buffer));
 
    /* and set the new title */
    flush_ps_display();
#endif                          /* not PS_USE_NONE */
}

References Assert().

Referenced by LockBufferForCleanup(), ResolveRecoveryConflictWithVirtualXIDs(), SyncRepWaitForLSN(), and WaitOnLock().

set_ps_display_suffix()

void set_ps_display_suffix

(

const char *

suffix

)

Definition at line 371 of file ps_status.c.

{
#ifndef PS_USE_NONE
    size_t      len;
 
    /* first, check if we need to update the process title */
    if (!update_ps_display_precheck())
        return;
 
    /* if there's already a suffix, overwrite it */
    if (ps_buffer_nosuffix_len > 0)
        ps_buffer_cur_len = ps_buffer_nosuffix_len;
    else
        ps_buffer_nosuffix_len = ps_buffer_cur_len;
 
    len = strlen(suffix);
 
    /* check if we have enough space to append the suffix */
    if (ps_buffer_cur_len + len + 1 >= ps_buffer_size)
    {
        /* not enough space.  Check the buffer isn't full already */
        if (ps_buffer_cur_len < ps_buffer_size - 1)
        {
            /* append a space before the suffix */
            ps_buffer[ps_buffer_cur_len++] = ' ';
 
            /* just add what we can and fill the ps_buffer */
            memcpy(ps_buffer + ps_buffer_cur_len, suffix,
                   ps_buffer_size - ps_buffer_cur_len - 1);
            ps_buffer[ps_buffer_size - 1] = '\0';
            ps_buffer_cur_len = ps_buffer_size - 1;
        }
    }
    else
    {
        ps_buffer[ps_buffer_cur_len++] = ' ';
        memcpy(ps_buffer + ps_buffer_cur_len, suffix, len + 1);
        ps_buffer_cur_len = ps_buffer_cur_len + len;
    }
 
    Assert(strlen(ps_buffer) == ps_buffer_cur_len);
 
    /* and set the new title */
    flush_ps_display();
#endif                          /* not PS_USE_NONE */
}

References Assert(), and len.

Referenced by LockBufferForCleanup(), ResolveRecoveryConflictWithVirtualXIDs(), SyncRepWaitForLSN(), and WaitOnLock().

set_ps_display_with_len()

void set_ps_display_with_len	(	const char *	activity,
		size_t	len
	)

Definition at line 453 of file ps_status.c.

{
    Assert(strlen(activity) == len);
 
#ifndef PS_USE_NONE
    /* first, check if we need to update the process title */
    if (!update_ps_display_precheck())
        return;
 
    /* wipe out any suffix when the title is completely changed */
    ps_buffer_nosuffix_len = 0;
 
    /* Update ps_buffer to contain both fixed part and activity */
    if (ps_buffer_fixed_size + len >= ps_buffer_size)
    {
        /* handle the case where ps_buffer doesn't have enough space */
        memcpy(ps_buffer + ps_buffer_fixed_size, activity,
               ps_buffer_size - ps_buffer_fixed_size - 1);
        ps_buffer[ps_buffer_size - 1] = '\0';
        ps_buffer_cur_len = ps_buffer_size - 1;
    }
    else
    {
        memcpy(ps_buffer + ps_buffer_fixed_size, activity, len + 1);
        ps_buffer_cur_len = ps_buffer_fixed_size + len;
    }
    Assert(strlen(ps_buffer) == ps_buffer_cur_len);
 
    /* Transmit new setting to kernel, if necessary */
    flush_ps_display();
#endif                          /* not PS_USE_NONE */
}

References Assert(), and len.

Referenced by exec_execute_message(), exec_simple_query(), and set_ps_display().

Variable Documentation

update_process_title

PGDLLIMPORT bool update_process_title

extern

Definition at line 31 of file ps_status.c.

Referenced by init_ps_display(), ResolveRecoveryConflictWithVirtualXIDs(), SendBaseBackup(), SyncRepWaitForLSN(), WalRcvWaitForStartPosition(), XLogSendPhysical(), and XLogWalRcvFlush().