1 files changed, 70 insertions, 0 deletions
diff --git a/lib/libkse/thread/thr_wait4.c b/lib/libkse/thread/thr_wait4.c
new file mode 100644
index 000000000000..6c4e068acb36
--- /dev/null
+++ b/lib/libkse/thread/thr_wait4.c
@@ -0,0 +1,70 @@
+/*
+ * 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 <sys/types.h>
+
+#include <errno.h>
+#include <sys/wait.h>
+#include <pthread.h>
+#include "pthread_private.h"
+
+__weak_reference(_wait4, wait4);
+
+pid_t
+_wait4(pid_t pid, int *istat, int options, struct rusage * rusage)
+{
+	struct pthread	*curthread = _get_curthread();
+	pid_t	ret;
+
+	_thread_kern_sig_defer();
+
+	/* Perform a non-blocking wait4 syscall: */
+	while ((ret = __sys_wait4(pid, istat, options | WNOHANG, rusage)) == 0 && (options & WNOHANG) == 0) {
+		/* Reset the interrupted operation flag: */
+		curthread->interrupted = 0;
+
+		/* Schedule the next thread while this one waits: */
+		_thread_kern_sched_state(PS_WAIT_WAIT, __FILE__, __LINE__);
+
+		/* Check if this call was interrupted by a signal: */
+		if (curthread->interrupted) {
+			errno = EINTR;
+			ret = -1;
+			break;
+		}
+	}
+
+	_thread_kern_sig_undefer();
+
+	return (ret);
+}