1 files changed, 131 insertions, 0 deletions
diff --git a/lib/libpthread/thread/thr_fork.c b/lib/libpthread/thread/thr_fork.c
new file mode 100644
index 0000000..4dfa487
--- /dev/null
+++ b/lib/libpthread/thread/thr_fork.c
@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by John Birrell.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <spinlock.h>
+#include <sys/signalvar.h>
+
+#include "libc_private.h"
+#include "thr_private.h"
+
+LT10_COMPAT_PRIVATE(_fork);
+LT10_COMPAT_DEFAULT(fork);
+
+__weak_reference(_fork, fork);
+
+pid_t
+_fork(void)
+{
+	sigset_t sigset, oldset;
+	struct pthread *curthread;
+	struct pthread_atfork *af;
+	pid_t ret;
+	int errsave;
+
+	curthread = _get_curthread();
+
+	if (!_kse_isthreaded()) {
+		SIGFILLSET(sigset);
+		__sys_sigprocmask(SIG_SETMASK, &sigset, &oldset);
+		ret = __sys_fork();
+		if (ret == 0)
+			/* Child */
+			__sys_sigprocmask(SIG_SETMASK, &curthread->sigmask,
+			    NULL);
+		else
+			__sys_sigprocmask(SIG_SETMASK, &oldset, NULL);
+		return (ret);
+	}
+
+	/*
+	 * Masks all signals until we reach a safe point in
+	 * _kse_single_thread, and the signal masks will be
+	 * restored in that function, for M:N thread, all 
+	 * signals were already masked in kernel atomically,
+	 * we only need to do this for bound thread.
+	 */
+	if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) {
+		SIGFILLSET(sigset);
+		__sys_sigprocmask(SIG_SETMASK, &sigset, &oldset);
+	}
+
+	_pthread_mutex_lock(&_thr_atfork_mutex);
+
+	/* Run down atfork prepare handlers. */
+	TAILQ_FOREACH_REVERSE(af, &_thr_atfork_list, atfork_head, qe) {
+		if (af->prepare != NULL)
+			af->prepare();
+	}
+
+	/* Fork a new process: */
+	if (_kse_isthreaded() != 0) {
+		_malloc_prefork();
+	}
+	if ((ret = __sys_fork()) == 0) {
+		/* Child process */
+		errsave = errno; 
+
+		/* Kernel signal mask is restored in _kse_single_thread */
+		_kse_single_thread(curthread);
+
+		/* Run down atfork child handlers. */
+		TAILQ_FOREACH(af, &_thr_atfork_list, qe) {
+			if (af->child != NULL)
+				af->child();
+		}
+		_thr_mutex_reinit(&_thr_atfork_mutex);
+	} else {
+		if (_kse_isthreaded() != 0) {
+			_malloc_postfork();
+		}
+		errsave = errno; 
+		if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM) {
+			__sys_sigprocmask(SIG_SETMASK, &oldset, NULL);
+		}
+		/* Run down atfork parent handlers. */
+		TAILQ_FOREACH(af, &_thr_atfork_list, qe) {
+			if (af->parent != NULL)
+				af->parent();
+		}
+		_pthread_mutex_unlock(&_thr_atfork_mutex);
+	}
+	errno = errsave;
+
+	/* Return the process ID: */
+	return (ret);
+}