[RFC PATCH 22/38] fork: prefer clone syscall

Jonas Bonn jonas at southpole.se
Tue Sep 6 08:30:46 UTC 2011


Signed-off-by: Jonas Bonn <jonas at southpole.se>
---
 libc/sysdeps/linux/common/fork.c |   19 ++++++++++++++++++-
 1 files changed, 18 insertions(+), 1 deletions(-)

diff --git a/libc/sysdeps/linux/common/fork.c b/libc/sysdeps/linux/common/fork.c
index 14e00a2..64c6d42 100644
--- a/libc/sysdeps/linux/common/fork.c
+++ b/libc/sysdeps/linux/common/fork.c
@@ -9,10 +9,27 @@
 
 #include <sys/syscall.h>
 #include <unistd.h>
+#include <signal.h>
 
 #ifdef __ARCH_USE_MMU__
 
-#ifdef __NR_fork
+#ifdef __NR_clone
+pid_t __libc_fork(void)
+{
+	pid_t pid;
+	pid = INLINE_SYSCALL(clone, 4, SIGCHLD, NULL, NULL, NULL);
+
+	if (pid < 0) {
+	        __set_errno (-pid);
+	        return -1;
+	}
+
+	return pid;
+} 
+weak_alias(__libc_fork,fork)
+libc_hidden_weak(fork)
+
+#elif defined __NR_fork
 #define __NR___libc_fork __NR_fork
 extern __typeof(fork) __libc_fork;
 _syscall0(pid_t, __libc_fork)
-- 
1.7.5.4



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