fcntl.c revision 238667 
1/*-
2 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
3 * Authors: Doug Rabson <dfr@rabson.org>
4 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/lib/libc/sys/fcntl.c 238667 2012-07-21 13:02:11Z kib $");
30
31#include <fcntl.h>
32#include <stdarg.h>
33#include <sys/types.h>
34#include <sys/syscall.h>
35#include "libc_private.h"
36
37__weak_reference(__fcntl_compat, fcntl);
38
39int
40__fcntl_compat(int fd, int cmd, ...)
41{
42	va_list args;
43	long arg;
44	struct __oflock ofl;
45	struct flock *flp;
46	int res;
47
48	va_start(args, cmd);
49	arg = va_arg(args, long);
50	va_end(args);
51
52	if (__getosreldate() >= 800028) {
53		return (__sys_fcntl(fd, cmd, arg));
54	} else {
55		if (cmd == F_GETLK || cmd == F_SETLK || cmd == F_SETLKW) {
56			/*
57			 * Convert new-style struct flock (which
58			 * includes l_sysid) to old-style.
59			 */
60			flp = (struct flock *) (uintptr_t) arg;
61			ofl.l_start = flp->l_start;
62			ofl.l_len = flp->l_len;
63			ofl.l_pid = flp->l_pid;
64			ofl.l_type = flp->l_type;
65			ofl.l_whence = flp->l_whence;
66
67			switch (cmd) {
68			case F_GETLK:
69				res = __sys_fcntl(fd, F_OGETLK, &ofl);
70				if (res >= 0) {
71					flp->l_start = ofl.l_start;
72					flp->l_len = ofl.l_len;
73					flp->l_pid = ofl.l_pid;
74					flp->l_type = ofl.l_type;
75					flp->l_whence = ofl.l_whence;
76					flp->l_sysid = 0;
77				}
78				return (res);
79
80			case F_SETLK:
81				return (__sys_fcntl(fd, F_OSETLK, &ofl));
82
83			case F_SETLKW:
84				return (__sys_fcntl(fd, F_OSETLKW, &ofl));
85			}
86		}
87		return (__sys_fcntl(fd, cmd, arg));
88	}
89}
90