1 files changed, 90 insertions, 0 deletions

diff --git a/lib/libpthread/thread/thr_fork.c b/lib/libpthread/thread/thr_fork.c
new file mode 100644
index 000000000000..6e7ca0d43b44
--- /dev/null
+++ b/lib/libpthread/thread/thr_fork.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 1995 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 REGENTS 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.
+ *
+ */
+#include <errno.h>
+#include <fcntl.h>
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+
+pid_t
+fork(void)
+{
+	int             flags;
+	pid_t           ret;
+
+	/* Fork a new process: */
+	if ((ret = _thread_sys_fork()) <= 0) {
+		/* Parent process or error. Nothing to do here. */
+	} else {
+		/* Close the pthread kernel pipe: */
+		_thread_sys_close(_thread_kern_pipe[0]);
+		_thread_sys_close(_thread_kern_pipe[1]);
+
+		/* Reset signals pending for the running thread: */
+		memset(_thread_run->sigpend, 0, sizeof(_thread_run->sigpend));
+
+		/*
+		 * Create a pipe that is written to by the signal handler to
+		 * prevent signals being missed in calls to
+		 * _thread_sys_select: 
+		 */
+		if (_thread_sys_pipe(_thread_kern_pipe) != 0) {
+			/* Cannot create pipe, so abort: */
+			PANIC("Cannot create pthread kernel pipe for forked process");
+		}
+		/* Get the flags for the read pipe: */
+		else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[0], F_GETFL, NULL)) == -1) {
+			/* Abort this application: */
+			abort();
+		}
+		/* Make the read pipe non-blocking: */
+		else if (_thread_sys_fcntl(_thread_kern_pipe[0], F_SETFL, flags | O_NONBLOCK) == -1) {
+			/* Abort this application: */
+			abort();
+		}
+		/* Get the flags for the write pipe: */
+		else if ((flags = _thread_sys_fcntl(_thread_kern_pipe[1], F_GETFL, NULL)) == -1) {
+			/* Abort this application: */
+			abort();
+		}
+		/* Make the write pipe non-blocking: */
+		else if (_thread_sys_fcntl(_thread_kern_pipe[1], F_SETFL, flags | O_NONBLOCK) == -1) {
+			/* Abort this application: */
+			abort();
+		}
+	}
+
+	/* Return the process ID: */
+	return (ret);
+}
+#endif