A more-conservative workaround for Cygwin SIGCHLD issues.

* callproc.c (Fcall_process):
* process.c (create_process):
Make sure SIGCHLD is caught before we fork,
since Emacs startup no arranges to catch SIGCHLD.
* process.c (lib_child_handler): Initialize to null, not to
dummy_handler.
(catch_child_signal): Allow self to be called lazily.
Do nothing if it's already been called.
Assume caller has blocked SIGCHLD (all callers do now).
* emacs.c (main): Do not catch SIGCHLD here; defer it until
just before it's really needed.
* nsterm.m (ns_term_init): No need to re-catch SIGCHLD here,
since it hasn't been caught yet.

Fixes: debbugs:14569

1 files changed, 17 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index f9451711f32..6357491725d 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,20 @@
+2013-06-23  Paul Eggert  <eggert@cs.ucla.edu>
+
+        A more-conservative workaround for Cygwin SIGCHLD issues (Bug#14569).
+        * callproc.c (Fcall_process):
+        * process.c (create_process):
+        Make sure SIGCHLD is caught before we fork,
+        since Emacs startup no arranges to catch SIGCHLD.
+        * process.c (lib_child_handler): Initialize to null, not to
+        dummy_handler.
+        (catch_child_signal): Allow self to be called lazily.
+        Do nothing if it's already been called.
+        Assume caller has blocked SIGCHLD (all callers do now).
+        * emacs.c (main): Do not catch SIGCHLD here; defer it until
+        just before it's really needed.
+        * nsterm.m (ns_term_init): No need to re-catch SIGCHLD here,
+        since it hasn't been caught yet.
+
 2013-06-23  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
         * image.c (compute_image_size): New function to implement