From: Filipp Gunbin <fgunbin@fastmail.fm>
To: 33154@debbugs.gnu.org
Subject: bug#33154: 27.0.50; create_process on Darwin should not invoke setsid() after vfork() [PATCH]
Date: Thu, 25 Oct 2018 22:30:12 +0300 [thread overview]
Message-ID: <m24ld94yez.fsf@fgunbin.playteam.ru> (raw)
This resulted from analysis of bug 33050. To avoid repetition, here's
the message with explanation:
http://lists.gnu.org/archive/html/bug-gnu-emacs/2018-10/msg00763.html
Suggested patch is below.
Thanks.
In GNU Emacs 27.0.50 (build 12, x86_64-apple-darwin17.7.0, NS appkit-1561.60 Version 10.13.6 (Build 17G65))
of 2018-10-25 built on fgunbin.playteam.ru
Repository revision: f1f1687fcd8d48cd519c0f2977bcecbf394a7f01
System Description: Mac OS X 10.13.6
diff --git a/src/process.c b/src/process.c
index 6cda4f27ac..1f8810927d 100644
--- a/src/process.c
+++ b/src/process.c
@@ -2066,21 +2066,7 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
int volatile forkerr_volatile = forkerr;
struct Lisp_Process *p_volatile = p;
-#ifdef DARWIN_OS
- /* Darwin doesn't let us run setsid after a vfork, so use fork when
- necessary. Also, reset SIGCHLD handling after a vfork, as
- apparently macOS can mistakenly deliver SIGCHLD to the child. */
- if (pty_flag)
- pid = fork ();
- else
- {
- pid = vfork ();
- if (pid == 0)
- signal (SIGCHLD, SIG_DFL);
- }
-#else
pid = vfork ();
-#endif
current_dir = current_dir_volatile;
lisp_pty_name = lisp_pty_name_volatile;
@@ -2091,15 +2077,35 @@ create_process (Lisp_Object process, char **new_argv, Lisp_Object current_dir)
p = p_volatile;
pty_flag = p->pty_flag;
-
if (pid == 0)
#endif /* not WINDOWSNT */
{
+#ifdef DARWIN_OS
+ /* Work around a macOS bug, where SIGCHLD is apparently
+ delivered to a vforked child instead of to its parent. See:
+ https://lists.gnu.org/r/emacs-devel/2017-05/msg00342.html
+ */
+ signal (SIGCHLD, SIG_DFL);
+#endif
+
/* Make the pty be the controlling terminal of the process. */
#ifdef HAVE_PTYS
/* First, disconnect its current controlling terminal.
Do this even if !PTY_FLAG; see Bug#30762. */
+#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);
+ }
+ }
+#else
setsid ();
+#endif
/* Make the pty's terminal the controlling terminal. */
if (pty_flag && forkin >= 0)
{
next reply other threads:[~2018-10-25 19:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-25 19:30 Filipp Gunbin [this message]
2018-10-26 11:12 ` bug#33154: 27.0.50; create_process on Darwin should not invoke setsid() after vfork() [PATCH] Alan Third
2018-11-07 1:35 ` Filipp Gunbin
2018-11-05 17:28 ` Paul Eggert
2018-11-06 13:46 ` Filipp Gunbin
2018-11-07 1:23 ` Filipp Gunbin
2018-11-07 7:41 ` Paul Eggert
2018-11-07 8:53 ` Filipp Gunbin
2018-11-07 15:40 ` Paul Eggert
2018-11-09 0:07 ` Alan Third
2018-11-09 10:29 ` Filipp Gunbin
2018-11-09 11:16 ` Andreas Schwab
2018-11-10 15:24 ` Filipp Gunbin
2018-11-10 17:09 ` Paul Eggert
2018-11-11 17:14 ` Filipp Gunbin
2018-11-10 17:05 ` Paul Eggert
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