From eb7d2d3ac2a82570c3d413f61d3832035e9d11dd Mon Sep 17 00:00:00 2001
From: Jamie Zawinski <jwz@jwz.org>
Date: Sat, 24 Oct 2015 22:58:02 +0900
Subject: [PATCH] Modify sigchld_hander / in_signal_hander_p mechanism

---
 driver/subprocs.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/driver/subprocs.c b/driver/subprocs.c
index 1969724..51332aa 100644
--- a/driver/subprocs.c
+++ b/driver/subprocs.c
@@ -387,6 +387,11 @@ block_sigchld (void)
 void
 unblock_sigchld (void)
 {
+  if (block_sigchld_handler <= 0)
+    abort();
+
+  if (block_sigchld_handler <= 1)  /* only unblock if count going to 0 */
+    {
 #ifdef HAVE_SIGACTION
   struct sigaction sa;
   sigset_t child_set;
@@ -402,6 +407,7 @@ unblock_sigchld (void)
 #else /* !HAVE_SIGACTION */
   signal(SIGPIPE, SIG_DFL);
 #endif /* !HAVE_SIGACTION */
+    }
 
   block_sigchld_handler--;
 }
@@ -415,7 +421,7 @@ kill_job (saver_info *si, pid_t pid, int signal)
 
   clean_job_list();
 
-  if (block_sigchld_handler)
+  if (in_signal_handler_p)
     /* This function should not be called from the signal handler. */
     abort();
 
-- 
2.5.0