Use vfork if possible on Darwin (bug#26397)

Co-authored-by: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>

* src/conf_post.h (HAVE_WORKING_VFORK): Don't undef.
(vfork): Don't define.
* src/process.c (create_process) [DARWIN_OS]: Use fork if pty_flag is
set, otherwise vfork.
* src/callproc.c (call_process) [DARWIN_OS]: Use TIOCNOTTY to detach
the controlling terminal instead of setsid.

1 files changed, 0 insertions, 6 deletions

diff --git a/src/conf_post.h b/src/conf_post.h
index 30c948e39af..95ebd5511ca 100644
--- a/src/conf_post.h
+++ b/src/conf_post.h
@@ -99,12 +99,6 @@ typedef bool bool_bf;
 #define realloc unexec_realloc
 #define free unexec_free
 #endif
-/* The following solves the problem that Emacs hangs when evaluating
-   (make-comint "test0" "/nodir/nofile" nil "") when /nodir/nofile
-   does not exist.  Also, setsid is not allowed in the vfork child's
-   context as of Darwin 9/Mac OS X 10.5.  */
-#undef HAVE_WORKING_VFORK
-#define vfork fork
 #endif  /* DARWIN_OS */
 
 /* If HYBRID_MALLOC is defined (e.g., on Cygwin), emacs will use