[Tarantool-patches] [PATCH v3 6/7] popen: use ioctl on macos

[Cyrill Gorcunov]

Due to os specifics we can't call setsid after
vfork on macos (vfork is not longer a part of
posix btw). Instead we can use ioctl to clear
the session.

Signed-off-by: Cyrill Gorcunov <gorcunov at gmail.com>
---
branch gorcunov/gh-4031-popen-fixup-3

Sasha, I do not send the whole series since the only
this particular patch is changed. Thus if needed we
can merge from the branch above.

 src/lib/core/popen.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/src/lib/core/popen.c b/src/lib/core/popen.c
index 6e5ca21bd..cc3d2d946 100644
--- a/src/lib/core/popen.c
+++ b/src/lib/core/popen.c
@@ -16,6 +16,10 @@
 #include "coio.h"
 #include "say.h"
 
+#ifdef TARGET_OS_DARWIN
+# include <sys/ioctl.h>
+#endif
+
 /* A mapping to find popens by their pids in a signal handler */
 static struct mh_i32ptr_t *popen_pids_map = NULL;
 
@@ -833,15 +837,24 @@ popen_new(struct popen_opts *opts)
 		if (opts->flags & POPEN_FLAG_RESTORE_SIGNALS)
 			signal_reset();
 
-		/*
-		 * We have to be a session leader otherwise
-		 * won't be able to kill a group of children.
-		 */
 		if (opts->flags & POPEN_FLAG_SETSID) {
+#ifndef TARGET_OS_DARWIN
 			if (setsid() == -1) {
 				say_syserror("child: setsid failed");
 				goto exit_child;
 			}
+#else
+			/*
+			 * Note that on MacOS we're not allowed to
+			 * set sid after vfork (it is OS specific)
+			 * thus use ioctl instead.
+			 */
+			int ttyfd = open("/dev/tty", O_RDWR, 0);
+			if (ttyfd >= 0) {
+				ioctl(ttyfd, TIOCNOTTY, 0);
+				close(ttyfd);
+			}
+#endif
 		}
 
 		if (opts->flags & POPEN_FLAG_CLOSE_FDS) {
-- 
2.20.1