Remove obsolete check in SIGTERM handler for the startup process.

Thanks to commit 3b00fdba9f, this check in the SIGTERM handler for
the startup process is now obsolete and can be removed.  Instead of
leaving around the dead function write_stderr_signal_safe(), I've
opted to just remove it for now.

This partially reverts commit 97550c0711.

Reviewed-by: Andres Freund, Noah Misch
Discussion: https://postgr.es/m/20231121212008.GA3742740%40nathanxps13

diff --git a/src/backend/postmaster/startup.c b/src/backend/postmaster/startup.c
index b6b53cd25f522f3db559649c8c8f8037e081c6da..44b6c5bb7585b447242a7075a5a65956c22ac61a 100644 (file)
--- a/src/backend/postmaster/startup.c
+++ b/src/backend/postmaster/startup.c
@@ -19,8 +19,6 @@
  */
 #include "postgres.h"
 
-#include <unistd.h>
-
 #include "access/xlog.h"
 #include "access/xlogrecovery.h"
 #include "access/xlogutils.h"
@@ -112,20 +110,7 @@ static void
 StartupProcShutdownHandler(SIGNAL_ARGS)
 {
        if (in_restore_command)
-       {
-               /*
-                * If we are in a child process (e.g., forked by system() in
-                * RestoreArchivedFile()), we don't want to call any exit callbacks.
-                * The parent will take care of that.
-                */
-               if (MyProcPid == (int) getpid())
-                       proc_exit(1);
-               else
-               {
-                       write_stderr_signal_safe("StartupProcShutdownHandler() called in child process\n");
-                       _exit(1);
-               }
-       }
+               proc_exit(1);
        else
                shutdown_requested = true;
        WakeupRecovery();

diff --git a/src/backend/utils/error/elog.c b/src/backend/utils/error/elog.c
index 700fbde6db4185489570e3c18e0deb7ed362916b..bba00a0087f9a494663edb3389e4c8dffae956bd 100644 (file)
--- a/src/backend/utils/error/elog.c
+++ b/src/backend/utils/error/elog.c
@@ -3737,31 +3737,3 @@ write_stderr(const char *fmt,...)
 #endif
        va_end(ap);
 }
-
-
-/*
- * Write a message to STDERR using only async-signal-safe functions.  This can
- * be used to safely emit a message from a signal handler.
- *
- * TODO: It is likely possible to safely do a limited amount of string
- * interpolation (e.g., %s and %d), but that is not presently supported.
- */
-void
-write_stderr_signal_safe(const char *str)
-{
-       int                     nwritten = 0;
-       int                     ntotal = strlen(str);
-
-       while (nwritten < ntotal)
-       {
-               int                     rc;
-
-               rc = write(STDERR_FILENO, str + nwritten, ntotal - nwritten);
-
-               /* Just give up on error.  There isn't much else we can do. */
-               if (rc == -1)
-                       return;
-
-               nwritten += rc;
-       }
-}

diff --git a/src/include/utils/elog.h b/src/include/utils/elog.h
index 761ee2512d982283b6b1b26f716e28edc18a3419..054dd2bf62f387709f3f535f67fdd7a0311b7fdf 100644 (file)
--- a/src/include/utils/elog.h
+++ b/src/include/utils/elog.h
@@ -536,10 +536,4 @@ extern void write_jsonlog(ErrorData *edata);
  */
 extern void write_stderr(const char *fmt,...) pg_attribute_printf(1, 2);
 
-/*
- * Write a message to STDERR using only async-signal-safe functions.  This can
- * be used to safely emit a message from a signal handler.
- */
-extern void write_stderr_signal_safe(const char *fmt);
-
 #endif                                                 /* ELOG_H */