[PATCH v2 23/46] fork: Use clone if arch does not have the fork syscall
Markos Chandras
markos.chandras at gmail.com
Mon Nov 26 14:24:05 UTC 2012
From: Markos Chandras <markos.chandras at imgtec.com>
Signed-off-by: Markos Chandras <markos.chandras at imgtec.com>
---
libc/sysdeps/linux/common/fork.c | 17 ++++++++++++++++-
libc/sysdeps/linux/common/stubs.c | 2 +-
2 files changed, 17 insertions(+), 2 deletions(-)
diff --git a/libc/sysdeps/linux/common/fork.c b/libc/sysdeps/linux/common/fork.c
index 14e00a2..7322581 100644
--- a/libc/sysdeps/linux/common/fork.c
+++ b/libc/sysdeps/linux/common/fork.c
@@ -9,10 +9,25 @@
#include <sys/syscall.h>
#include <unistd.h>
+#include <unistd.h>
+#include <signal.h>
#ifdef __ARCH_USE_MMU__
-#ifdef __NR_fork
+#if defined(__NR_clone) && !defined(__NR_fork)
+pid_t __libc_fork(void)
+{
+ pid_t pid = INLINE_SYSCALL(clone, 4, SIGCHLD, NULL, NULL, NULL);
+
+ if (pid<0)
+ 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)
diff --git a/libc/sysdeps/linux/common/stubs.c b/libc/sysdeps/linux/common/stubs.c
index b7e0357..9cb8de0 100644
--- a/libc/sysdeps/linux/common/stubs.c
+++ b/libc/sysdeps/linux/common/stubs.c
@@ -105,7 +105,7 @@ make_stub(fdatasync)
make_stub(flistxattr)
#endif
-#ifndef __NR_fork
+#if !defined(__NR_fork) && !defined(__NR_clone)
make_stub(fork)
#endif
--
1.8.0
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