Try to avoid malloc SEGVs on Cygwin.

* callproc.c, process.h (block_child_signal, unblock_child_signal):
Now extern.
* emacs.c (main): Catch SIGCHLD just before initializing gfilenotify.
* process.c (catch_child_signal): Block SIGCHLD while futzing with
the SIGCHLD handler, since the code is not atomic and (due to glib)
signals may be arriving now.
* sysdep.c (init_signals): Do not catch child signals here;
'main' now does that later, at a safer time.

Fixes: debbugs:14569

1 files changed, 2 insertions, 0 deletions

diff --git a/src/process.h b/src/process.h
index 9455df18beb..3f86e5f3945 100644
--- a/src/process.h
+++ b/src/process.h
@@ -200,6 +200,8 @@ extern Lisp_Object QCflowcontrol, Qhw, Qsw, QCsummary;
 
 /* Defined in callproc.c.  */
 
+extern void block_child_signal (void);
+extern void unblock_child_signal (void);
 extern void record_kill_process (struct Lisp_Process *);
 
 /* Defined in process.c.  */