From: Paul Eggert <eggert@cs.ucla.edu>
Date: Sun, 21 May 2017 08:46:44 +0000 (-0700)
Subject: Work around macOS bug with vforked child
X-Git-Tag: emacs-26.0.90~521^2~328
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=cb6d66974416f535fefb42c974b73037e257399a;p=emacs.git

Work around macOS bug with vforked child

* src/callproc.c (call_process) [DARWIN_OS]:
Include workaround for apparent macOS bug.
---

diff --git a/src/callproc.c b/src/callproc.c
index 7c85eed835f..4cec02be7ef 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -631,6 +631,14 @@ call_process (ptrdiff_t nargs, Lisp_Object *args, int filefd,
 
   if (pid == 0)
     {
+#ifdef DARWIN_OS
+      /* Work around a macOS bug, where SIGCHLD is apparently
+	 delivered to a vforked child instead of to its parent.  See:
+	 http://lists.gnu.org/archive/html/emacs-devel/2017-05/msg00342.html
+      */
+      signal (SIGCHLD, SIG_DFL);
+#endif
+
       unblock_child_signal (&oldset);
 
 #ifdef DARWIN_OS