[PATCH v3 24/48] fork: Use clone if arch does not have the fork syscall

[Markos Chandras]

From: Markos Chandras <markos.chandras at imgtec.com>

Signed-off-by: Markos Chandras <markos.chandras at imgtec.com>
---
 libc/sysdeps/linux/common/fork.c  | 19 +++++++++++++++++++
 libc/sysdeps/linux/common/stubs.c |  2 +-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/libc/sysdeps/linux/common/fork.c b/libc/sysdeps/linux/common/fork.c
index fa1f4af..104cf81 100644
--- a/libc/sysdeps/linux/common/fork.c
+++ b/libc/sysdeps/linux/common/fork.c
@@ -15,6 +15,25 @@
 _syscall0(pid_t, fork)
 # ifdef __UCLIBC_HAS_THREADS__
 strong_alias(fork,__libc_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)
+weak_alias(__libc_fork,fork)
 libc_hidden_weak(fork)
 # else
 libc_hidden_def(fork)
diff --git a/libc/sysdeps/linux/common/stubs.c b/libc/sysdeps/linux/common/stubs.c
index f429467..856b08a 100644
--- a/libc/sysdeps/linux/common/stubs.c
+++ b/libc/sysdeps/linux/common/stubs.c
@@ -128,7 +128,7 @@ make_stub(fgetxattr)
 make_stub(flistxattr)
 #endif
 
-#ifndef __NR_fork
+#if !defined(__NR_fork) && !defined(__NR_clone)
 make_stub(fork)
 #endif
 
-- 
1.8.1.1