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bug#26397: [PATCH] Use vfork if possible on Darwin (bug#26397)

From: YAMAMOTO Mitsuharu
Subject: bug#26397: [PATCH] Use vfork if possible on Darwin (bug#26397)
Date: Mon, 10 Apr 2017 10:11:16 +0900
User-agent: Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.8 (Shij┼Ź) APEL/10.6 Emacs/22.3 (sparc-sun-solaris2.8) MULE/5.0 (SAKAKI)

>>>>> On Sun, 9 Apr 2017 17:06:21 -0700, Aaron Jensen <address@hidden> said:

> For me, this slows down call-process in TTY emacs by 3ms (from
> 2.5ms->5.5ms). I typically launch a GUI emacs and connect to the
> server in TTY via emacsclient, and in that scenario this patch does
> not slow down call-process in the TTY, but it will affect those who
> use TTY only, it seems.

Then use "obsolete" ioctl TIOCNOTTY instead of setsid?  I'm not
familiar with this matter, so could someone check if this is OK?  I
confirmed that only the controlling terminal of the child process was

                                     YAMAMOTO Mitsuharu

diff --git a/src/callproc.c b/src/callproc.c
index 05048576ce..3f6df422f3 100644
--- a/src/callproc.c
+++ b/src/callproc.c
@@ -52,6 +52,8 @@ along with GNU Emacs.  If not, see 
<http://www.gnu.org/licenses/>.  */
 #include "syswait.h"
 #include "blockinput.h"
 #include "frame.h"
+#include "systty.h"
+#include "keyboard.h"
 #ifdef MSDOS
 #include "msdos.h"
@@ -626,7 +628,18 @@ call_process (ptrdiff_t nargs, Lisp_Object *args, int 
       unblock_child_signal (&oldset);
+#ifdef DARWIN_OS
+      /* Darwin doesn't let us run setsid after a vfork, so use
+        TIOCNOTTY when necessary. */
+      int j = emacs_open (DEV_TTY, O_RDWR, 0);
+      if (j >= 0)
+       {
+         ioctl (j, TIOCNOTTY, 0);
+         emacs_close (j);
+       }
       setsid ();
       /* Emacs ignores SIGPIPE, but the child should not.  */
       signal (SIGPIPE, SIG_DFL);

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