clone: make clone a wrapper around __clone

The architecture-specific assembly versions of clone did not set errno on
failure, which is inconsistent with glibc.  __clone still returns the error
via its return value, and clone is now a wrapper that sets errno as needed.
The public clone has also been moved to src/linux, as it's not directly
related to the pthreads API.

__clone is called by pthread_create, which does not report errors via
errno.  Though not strictly necessary, it's nice to avoid clobbering errno
here.

1 files changed, 2 insertions, 5 deletions

diff --git a/src/thread/clone.c b/src/thread/clone.c
index 339e28a3..be80c8ea 100644
--- a/src/thread/clone.c
+++ b/src/thread/clone.c
@@ -1,10 +1,7 @@
 #include <errno.h>
-#include "libc.h"
+#include "pthread_impl.h"
 
 int __clone(int (*func)(void *), void *stack, int flags, void *arg, ...)
 {
-	errno = ENOSYS;
-	return -1;
+	return -ENOSYS;
 }
-
-weak_alias(__clone, clone);