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Commit2f8c7c8

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committed
Make pg_ctl status do a kill() test to verify that the PID found in
postmaster.pid still represents a live postmaster.
1 parent1c155c8 commit2f8c7c8

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1 file changed

+61
-23
lines changed

1 file changed

+61
-23
lines changed

‎src/bin/pg_ctl/pg_ctl.c

Lines changed: 61 additions & 23 deletions
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,7 @@
44
*
55
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
66
*
7-
* $PostgreSQL: pgsql/src/bin/pg_ctl/pg_ctl.c,v 1.55 2005/03/11 17:20:33 momjian Exp $
7+
* $PostgreSQL: pgsql/src/bin/pg_ctl/pg_ctl.c,v 1.56 2005/04/20 23:10:16 tgl Exp $
88
*
99
*-------------------------------------------------------------------------
1010
*/
@@ -236,7 +236,7 @@ static pgpid_t
236236
get_pgpid(void)
237237
{
238238
FILE*pidf;
239-
pgpid_tpid;
239+
longpid;
240240

241241
pidf=fopen(pid_file,"r");
242242
if (pidf==NULL)
@@ -246,14 +246,19 @@ get_pgpid(void)
246246
return0;
247247
else
248248
{
249-
write_stderr(_("%s: could not open PID file \"%s\": %s"),
249+
write_stderr(_("%s: could not open PID file \"%s\": %s\n"),
250250
progname,pid_file,strerror(errno));
251251
exit(1);
252252
}
253253
}
254-
fscanf(pidf,"%ld",&pid);
254+
if (fscanf(pidf,"%ld",&pid)!=1)
255+
{
256+
write_stderr(_("%s: invalid data in PID file \"%s\"\n"),
257+
progname,pid_file);
258+
exit(1);
259+
}
255260
fclose(pidf);
256-
returnpid;
261+
return(pgpid_t)pid;
257262
}
258263

259264

@@ -766,34 +771,67 @@ do_reload(void)
766771
*utility routines
767772
*/
768773

774+
staticbool
775+
postmaster_is_alive(pid_tpid)
776+
{
777+
/*
778+
* Test to see if the process is still there. Note that we do not
779+
* consider an EPERM failure to mean that the process is still there;
780+
* EPERM must mean that the given PID belongs to some other userid,
781+
* and considering the permissions on $PGDATA, that means it's not
782+
* the postmaster we are after.
783+
*
784+
* Don't believe that our own PID or parent shell's PID is the postmaster,
785+
* either. (Windows hasn't got getppid(), though.)
786+
*/
787+
if (pid==getpid())
788+
return false;
789+
#ifndefWIN32
790+
if (pid==getppid())
791+
return false;
792+
#endif
793+
if (kill(pid,0)==0)
794+
return true;
795+
return false;
796+
}
797+
769798
staticvoid
770799
do_status(void)
771800
{
772801
pgpid_tpid;
773802

774803
pid=get_pgpid();
775-
if (pid==0)/* no pid file */
776-
{
777-
printf(_("%s: neither postmaster nor postgres running\n"),progname);
778-
exit(1);
779-
}
780-
elseif (pid<0)/* standalone backend */
781-
{
782-
pid=-pid;
783-
printf(_("%s: a standalone backend \"postgres\" is running (PID: %ld)\n"),progname,pid);
784-
}
785-
else
786-
/* postmaster */
804+
if (pid!=0)/* 0 means no pid file */
787805
{
788-
char**optlines;
806+
if (pid<0)/* standalone backend */
807+
{
808+
pid=-pid;
809+
if (postmaster_is_alive((pid_t)pid))
810+
{
811+
printf(_("%s: a standalone backend \"postgres\" is running (PID: %ld)\n"),
812+
progname,pid);
813+
return;
814+
}
815+
}
816+
else/* postmaster */
817+
{
818+
if (postmaster_is_alive((pid_t)pid))
819+
{
820+
char**optlines;
789821

790-
printf(_("%s: postmaster is running (PID: %ld)\n"),progname,pid);
822+
printf(_("%s: postmaster is running (PID: %ld)\n"),
823+
progname,pid);
791824

792-
optlines=readfile(postopts_file);
793-
if (optlines!=NULL)
794-
for (;*optlines!=NULL;optlines++)
795-
fputs(*optlines,stdout);
825+
optlines=readfile(postopts_file);
826+
if (optlines!=NULL)
827+
for (;*optlines!=NULL;optlines++)
828+
fputs(*optlines,stdout);
829+
return;
830+
}
831+
}
796832
}
833+
printf(_("%s: neither postmaster nor postgres running\n"),progname);
834+
exit(1);
797835
}
798836

799837

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