[src/trunk]: src/lib/librumphijack Define the expansion of the VFORK macro, n...

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e6e7ba9255ed
branches:  trunk
changeset: 807465:e6e7ba9255ed
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Sat Apr 11 12:54:41 2015 +0000

description:
Define the expansion of the VFORK macro, not the symbol `VFORK'.

Fixes hijacking processes that vfork and exec.  Symptom was the child
would spin with read/EAGAIN <-> kevent/EBADF because the inheritance
mechanism relied on setting the holyfd to -1 on fork...which didn't
happen if we didn't hijack vfork.

ok pooka@

diffstat:

 lib/librumphijack/hijack.c |  7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diffs (28 lines):

diff -r d195eaaae97e -r e6e7ba9255ed lib/librumphijack/hijack.c
--- a/lib/librumphijack/hijack.c        Sat Apr 11 10:10:14 2015 +0000
+++ b/lib/librumphijack/hijack.c        Sat Apr 11 12:54:41 2015 +0000
@@ -1,4 +1,4 @@
-/*      $NetBSD: hijack.c,v 1.116 2015/03/05 00:26:17 pooka Exp $      */
+/*      $NetBSD: hijack.c,v 1.117 2015/04/11 12:54:41 riastradh Exp $  */
 
 /*-
  * Copyright (c) 2011 Antti Kantee.  All Rights Reserved.
@@ -34,7 +34,7 @@
 #include <rump/rumpuser_port.h>
 
 #if !defined(lint)
-__RCSID("$NetBSD: hijack.c,v 1.116 2015/03/05 00:26:17 pooka Exp $");
+__RCSID("$NetBSD: hijack.c,v 1.117 2015/04/11 12:54:41 riastradh Exp $");
 #endif
 
 #include <sys/param.h>
@@ -1721,7 +1721,8 @@
 }
 #ifdef VFORK
 /* we do not have the luxury of not requiring a stackframe */
-__strong_alias(VFORK,fork);
+#define        __strong_alias_macro(m, f)      __strong_alias(m, f)
+__strong_alias_macro(VFORK,fork);
 #endif
 
 int