From b8a0f2d8ab1d7616d3d329049a396e464300479b Mon Sep 17 00:00:00 2001
From: "Richard M. Stallman" <rms@gnu.org>
Date: Tue, 18 Oct 1994 11:23:18 +0000
Subject: [PATCH] [SYSV_IPC] (main): Catch SIGHUP as well.  Don't call kill
 with pid 0.  Handle EINTR when receiving messages.

---
 lib-src/emacsserver.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/lib-src/emacsserver.c b/lib-src/emacsserver.c
index 1c8fc1d15ba..1017639bda2 100644
--- a/lib-src/emacsserver.c
+++ b/lib-src/emacsserver.c
@@ -252,6 +252,11 @@ main ()
 #include <sys/ipc.h>
 #include <sys/msg.h>
 #include <setjmp.h>
+#include <errno.h>
+
+#ifndef errno
+extern int errno;
+#endif
 
 jmp_buf msgenv;
 
@@ -303,11 +308,13 @@ main ()
   if (setjmp (msgenv))
     {
       msgctl (s, IPC_RMID, 0);
-      kill (p, SIGKILL);
+      if (p > 0)
+	kill (p, SIGKILL);
       exit (0);
     }
   signal (SIGTERM, msgcatch);
   signal (SIGINT, msgcatch);
+  signal (SIGHUP, msgcatch);
   if (p > 0)
     {
       /* This is executed in the original process that did the fork above.  */
@@ -349,6 +356,10 @@ main ()
     {
       if ((fromlen = msgrcv (s, msgp, BUFSIZ - 1, 1, 0)) < 0)
         {
+#ifdef EINTR
+	  if (errno == EINTR)
+	    continue;
+#endif
 	  perror ("msgrcv");
 	  exit (1);
         }
-- 
2.39.5