postmaster disappears

Hi,

I got a few reports from users that postmaster disappears for unknown
reason. Inspecting the postmaster log, I found that postmaster exited at:

if (select(nSockets, &rmask, &wmask, (fd_set *) NULL,       (struct timeval *) NULL) < 0)
{if (errno == EINTR)    continue;fprintf(stderr, "%s: ServerLoop: select failed: %s\n",        progname,
strerror(errno));returnSTATUS_ERROR; <-- here
 
}

In this case errno=ECHILD has been returned that makes postmaster
exiting. This could happen if SIGCHLD raised between select() call and
the next if (errno=...) statement. One of the solution would be
ignoring ECHILD as well as EINTR. Included are patches for this. If
there's no objection, I will commit them to both stable and current
tree.

*** postgresql-6.5.1/src/backend/postmaster/postmaster.c~    Thu Jul  8 02:17:48 1999
--- postgresql-6.5.1/src/backend/postmaster/postmaster.c    Thu Sep  9 10:14:30 1999
***************
*** 709,719 ****         if (select(nSockets, &rmask, &wmask, (fd_set *) NULL,                    (struct timeval *)
NULL)< 0)         {
 
!             if (errno == EINTR)                 continue;
!             fprintf(stderr, "%s: ServerLoop: select failed: %s\n",                     progname, strerror(errno));
!             return STATUS_ERROR;         }          /*
--- 709,729 ----         if (select(nSockets, &rmask, &wmask, (fd_set *) NULL,                    (struct timeval *)
NULL)< 0)         {
 
!             switch(errno) {
!             case EINTR:                 continue;
!                 break;
!             case ECHILD:
!                 fprintf(stderr, "%s: ServerLoop: ignoring ECHILD\n",
!                     progname);
!                 continue;
!                 break;
!             default:
!                 fprintf(stderr, "%s: ServerLoop: select failed: %s\n",                     progname,
strerror(errno));
!                 return STATUS_ERROR;
!                 break;
!             }         }          /*