[RFC PATCH 20/38] vfork: prefer clone syscall

[Jonas Bonn]

Signed-off-by: Jonas Bonn <jonas at southpole.se>
---
 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..f7a5bd5 100644
--- a/libc/sysdeps/linux/common/vfork.c
+++ b/libc/sysdeps/linux/common/vfork.c
@@ -7,10 +7,28 @@
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/syscall.h>
+#include <signal.h>
 
 extern __typeof(vfork) __vfork attribute_hidden;
 
-#ifdef __NR_vfork
+#ifdef __NR_clone
+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)
-- 
1.7.5.4