1 files changed, 104 insertions, 0 deletions
diff --git a/usr/src/lib/libc/port/sys/lockf.c b/usr/src/lib/libc/port/sys/lockf.c
new file mode 100644
index 0000000000..f1bb62a12f
--- /dev/null
+++ b/usr/src/lib/libc/port/sys/lockf.c
@@ -0,0 +1,104 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+/*	Copyright (c) 1988 AT&T	*/
+/*	  All Rights Reserved  	*/
+
+
+#include <sys/feature_tests.h>
+
+#if !defined(_LP64) && _FILE_OFFSET_BITS == 64
+#define	_lockf		_lockf64
+#endif
+
+#include "synonyms.h"
+#include <sys/types.h>
+#include <unistd.h>
+#include <errno.h>
+#include <fcntl.h>
+
+int
+_lockf(int fildes, int function, off_t size)
+{
+	struct flock l;
+	int rv;
+
+	l.l_whence = 1;
+	if (size < 0) {
+		l.l_start = size;
+		l.l_len = -size;
+	} else {
+		l.l_start = (off_t)0;
+		l.l_len = size;
+	}
+	switch (function) {
+	case F_ULOCK:
+		l.l_type = F_UNLCK;
+		rv = fcntl(fildes, F_SETLK, &l);
+		break;
+	case F_LOCK:
+		l.l_type = F_WRLCK;
+		rv = fcntl(fildes, F_SETLKW, &l);
+		break;
+	case F_TLOCK:
+		l.l_type = F_WRLCK;
+		rv = fcntl(fildes, F_SETLK, &l);
+		break;
+	case F_TEST:
+		l.l_type = F_WRLCK;
+		rv = fcntl(fildes, F_GETLK, &l);
+		if (rv != -1) {
+			if (l.l_type == F_UNLCK)
+				return (0);
+			else {
+				errno = EAGAIN;
+				return (-1);
+			}
+		}
+		break;
+	default:
+		errno = EINVAL;
+		return (-1);
+	}
+	if (rv < 0) {
+		switch (errno) {
+		case EMFILE:
+		case ENOSPC:
+		case ENOLCK:
+			/*
+			 * A deadlock error is given if we run out of resources,
+			 * in compliance with /usr/group standards.
+			 */
+			errno = EDEADLK;
+			break;
+		default:
+			break;
+		}
+	}
+	return (rv);
+}