implement _Fork and refactor fork using it

the _Fork interface is defined for future issue of POSIX as the
outcome of Austin Group issue 62, which drops the AS-safety
requirement for fork, and provides an AS-safe replacement that does
not run the registered atfork handlers.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/process/fork.c b/src/process/fork.c
new file mode 100644
index 00000000..a12da01a
--- /dev/null
+++ b/src/process/fork.c
@@ -0,0 +1,13 @@
+#include <unistd.h>
+#include "libc.h"
+
+static void dummy(int x) { }
+weak_alias(dummy, __fork_handler);
+
+pid_t fork(void)
+{
+	__fork_handler(-1);
+	pid_t ret = _Fork();
+	__fork_handler(!ret);
+	return ret;
+}