[PATCH 21/46] vfork: Use clone if arch does not have the vfork syscall
Markos Chandras
markos.chandras at gmail.com
Tue Nov 13 11:31:30 UTC 2012
From: Markos Chandras <markos.chandras at imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras at imgtec.com>
---
libc/sysdeps/linux/common/vfork.c | 20 +++++++++++++++++++-
1 files changed, 19 insertions(+), 1 deletions(-)
diff --git a/libc/sysdeps/linux/common/vfork.c b/libc/sysdeps/linux/common/vfork.c
index e7c9208..16f5f79 100644
--- a/libc/sysdeps/linux/common/vfork.c
+++ b/libc/sysdeps/linux/common/vfork.c
@@ -4,13 +4,31 @@
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
+#include <signal.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/syscall.h>
extern __typeof(vfork) __vfork attribute_hidden;
-#ifdef __NR_vfork
+#if defined(__NR_clone) && ! defined(__NR_vfork)
+pid_t __vfork(void)
+{
+ pid_t pid;
+ pid = INLINE_SYSCALL(clone, 4, CLONE_VFORK | CLONE_VM |
+ SIGCHLD, NULL, NULL, NULL);
+
+ if (pid<0) {
+ __set_errno(-pid);
+ return -1
+ }
+
+ return pid;
+}
+weak_alias(__vfork,vfork)
+libc_hidden_weak(vfork)
+
+#elif defined(__NR_vfork)
# define __NR___vfork __NR_vfork
_syscall0(pid_t, __vfork)
--
1.7.1
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