Improve signal handling.

diff --git a/xwait.c b/xwait.c
index d18fa36..c74d2e2 100644 (file)
--- a/xwait.c
+++ b/xwait.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: xwait.c,v 1.6 1998/12/11 09:50:07 mdw Exp $
+ * $Id: xwait.c,v 1.7 1999/06/19 23:42:37 mdw Exp $
  *
  * Wait until prodded by another X client
  *
@@ -29,6 +29,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: xwait.c,v $
+ * Revision 1.7  1999/06/19 23:42:37  mdw
+ * Improve signal handling.
+ *
  * Revision 1.6  1998/12/11 09:50:07  mdw
  * Minor modifications to work with mLib and mgLib.
  *
@@ -53,6 +56,7 @@
 
 /*----- Header files ------------------------------------------------------*/
 
+#include <errno.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -76,8 +80,10 @@
 
 static void sigchld(int sig)
 {
+  int e = errno;
   while (waitpid(-1, 0, WNOHANG) > 0)
     ;
+  errno = e;
 }
 
 /* --- @main@ --- */
@@ -239,7 +245,10 @@ int main(int argc, char *argv[])
     sa.sa_handler = sigchld;
     sigemptyset(&sa.sa_mask);
     sigaddset(&sa.sa_mask, SIGCHLD);
-    sa.sa_flags = 0;
+    sa.sa_flags = SA_NOCLDSTOP;
+#ifdef SA_RESTART
+    sa.sa_flags |= SA_RESTART;
+#endif
     sigaction(SIGCHLD, &sa, 0);
 
     /* --- Now reap any which have been waiting around so far --- */