rename fork source file

this is in preparation for implementing _Fork from POSIX-future,
factored as a separate commit to improve readability of history.

1 files changed, 44 insertions, 0 deletions

diff --git a/src/process/_Fork.c b/src/process/_Fork.c
new file mode 100644
index 00000000..17fb87ad
--- /dev/null
+++ b/src/process/_Fork.c
@@ -0,0 +1,44 @@
+#include <unistd.h>
+#include <string.h>
+#include <signal.h>
+#include "syscall.h"
+#include "libc.h"
+#include "lock.h"
+#include "pthread_impl.h"
+
+static void dummy(int x)
+{
+}
+
+weak_alias(dummy, __fork_handler);
+weak_alias(dummy, __aio_atfork);
+
+pid_t fork(void)
+{
+	pid_t ret;
+	sigset_t set;
+	__fork_handler(-1);
+	__block_all_sigs(&set);
+	__aio_atfork(-1);
+	LOCK(__abort_lock);
+#ifdef SYS_fork
+	ret = __syscall(SYS_fork);
+#else
+	ret = __syscall(SYS_clone, SIGCHLD, 0);
+#endif
+	if (!ret) {
+		pthread_t self = __pthread_self();
+		self->tid = __syscall(SYS_gettid);
+		self->robust_list.off = 0;
+		self->robust_list.pending = 0;
+		self->next = self->prev = self;
+		__thread_list_lock = 0;
+		libc.threads_minus_1 = 0;
+		if (libc.need_locks) libc.need_locks = -1;
+	}
+	UNLOCK(__abort_lock);
+	__aio_atfork(!ret);
+	__restore_sigs(&set);
+	__fork_handler(!ret);
+	return __syscall_ret(ret);
+}