From 95e29d952ecd82c555827174fc38bc2ca8e8dee0 Mon Sep 17 00:00:00 2001
From: mdw <mdw>
Date: Wed, 5 May 1999 18:55:18 +0000
Subject: [PATCH] Block SIGCHLD around the `fork' call to prevent a race.

---
 xcatch.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/xcatch.c b/xcatch.c
index 43d3b02..a341cb1 100644
--- a/xcatch.c
+++ b/xcatch.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: xcatch.c,v 1.4 1999/03/24 22:23:57 mdw Exp $
+ * $Id: xcatch.c,v 1.5 1999/05/05 18:55:18 mdw Exp $
  *
  * Catch input and trap it in an X window
  *
@@ -29,6 +29,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: xcatch.c,v $
+ * Revision 1.5  1999/05/05 18:55:18  mdw
+ * Block SIGCHLD around the `fork' call to prevent a race.
+ *
  * Revision 1.4  1999/03/24 22:23:57  mdw
  * Improve display for large files.  Keep newly added material in view if
  * scrolled to bottom of window.
@@ -327,6 +330,7 @@ int main(int argc, char *argv[])
     else {
       int pfd[2];
       struct sigaction sa;
+      sigset_t newmask, oldmask;
 
       /* --- Set up a signal handler --- */
 
@@ -339,6 +343,11 @@ int main(int argc, char *argv[])
 
       if (pipe(pfd))
 	die(1, "couldn't open pipe: %s", strerror(errno));
+
+      sigemptyset(&newmask);
+      sigaddset(&newmask, SIGCHLD);
+      sigprocmask(SIG_BLOCK, &newmask, &oldmask);
+
       kid = fork();
       if (kid < 0)
 	die(1, "couldn't fork: %s", strerror(errno));
@@ -360,6 +369,8 @@ int main(int argc, char *argv[])
 	write(STDERR_FILENO, d.buf, d.len);
 	_exit(127);
       }
+
+      sigprocmask(SIG_SETMASK, &oldmask, 0);
       fd = pfd[0];
       close(pfd[1]);
     }
-- 
2.11.0