This graph shows which files directly or indirectly include 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 (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 414 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 LockBufferForCleanup(), log_status_format(), ResolveRecoveryConflictWithVirtualXIDs(), SyncRepWaitForLSN(), WaitOnLock(), write_csvlog(), and write_jsonlog().

◆ init_ps_display()

void init_ps_display ( const char * fixed_part )

Definition at line 251 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;
 #endif
  
     /*
      * Overwrite argv[] to point at appropriate space, if needed
      */
  
 #ifdef PS_USE_CHANGE_ARGV
     save_argv[0] = ps_buffer;
     save_argv[1] = NULL;
 #endif                          /* PS_USE_CHANGE_ARGV */
  
 #ifdef PS_USE_CLOBBER_ARGV
     {
         int         i;
  
         /* make extra argv slots point at end_of_area (a NUL) */
         for (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(), AuxiliaryProcessMain(), BackendInitialize(), StartBackgroundWorker(), and SysLoggerMain().

◆ save_ps_display_args()

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

Definition at line 124 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 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])
                 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;
     }
 #endif                          /* PS_USE_CLOBBER_ARGV */
  
 #if defined(PS_USE_CHANGE_ARGV) || defined(PS_USE_CLOBBER_ARGV)
  
     /*
      * 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 (and perhaps other NeXT-derived platforms?) has a static copy
          * of the argv pointer, which we may fix like so:
          */
         *_NSGetArgv() = new_argv;
 #endif
  
         argv = new_argv;
     }
 #endif                          /* PS_USE_CHANGE_ARGV or PS_USE_CLOBBER_ARGV */
  
     return argv;
 }

References environ, exit(), i, malloc, save_argc, save_argv, and write_stderr.

Referenced by main().

◆ set_ps_display()

void set_ps_display ( const char * activity )

Definition at line 342 of file ps_status.c.

 {
 #ifndef PS_USE_NONE
     /* update_process_title=off disables updates */
     if (!update_process_title)
         return;
  
     /* no ps display for stand-alone backend */
     if (!IsUnderPostmaster)
         return;
  
 #ifdef PS_USE_CLOBBER_ARGV
     /* If ps_buffer is a pointer, it might still be null */
     if (!ps_buffer)
         return;
 #endif
  
     /* Update ps_buffer to contain both fixed part and activity */
     strlcpy(ps_buffer + ps_buffer_fixed_size, activity,
             ps_buffer_size - ps_buffer_fixed_size);
     ps_buffer_cur_len = strlen(ps_buffer);
  
     /* Transmit new setting to kernel, if necessary */
  
 #ifdef PS_USE_SETPROCTITLE
     setproctitle("%s", ps_buffer);
 #elif defined(PS_USE_SETPROCTITLE_FAST)
     setproctitle_fast("%s", ps_buffer);
 #endif
  
 #ifdef PS_USE_PS_STRINGS
     PS_STRINGS->ps_nargvstr = 1;
     PS_STRINGS->ps_argvstr = ps_buffer;
 #endif                          /* PS_USE_PS_STRINGS */
  
 #ifdef PS_USE_CLOBBER_ARGV
     /* pad unused memory; need only clobber remainder of old status string */
     if (last_status_len > ps_buffer_cur_len)
         MemSet(ps_buffer + ps_buffer_cur_len, PS_PADDING,
                last_status_len - ps_buffer_cur_len);
     last_status_len = ps_buffer_cur_len;
 #endif                          /* PS_USE_CLOBBER_ARGV */
  
 #ifdef PS_USE_WIN32
     {
         /*
          * Win32 does not support showing any changed arguments. To make it at
          * all possible to track which backend is doing what, we create a
          * named object that can be viewed with for example Process Explorer.
          */
         static HANDLE ident_handle = INVALID_HANDLE_VALUE;
         char        name[PS_BUFFER_SIZE + 32];
  
         if (ident_handle != INVALID_HANDLE_VALUE)
             CloseHandle(ident_handle);
  
         sprintf(name, "pgident(%d): %s", MyProcPid, ps_buffer);
  
         ident_handle = CreateEvent(NULL, TRUE, FALSE, name);
     }
 #endif                          /* PS_USE_WIN32 */
 #endif                          /* not PS_USE_NONE */
 }