utimensat.c revision 293474 
1/*-
2 * Copyright (c) 2015 Jilles Tjoelker
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/10/lib/libc/sys/utimensat.c 293474 2016-01-09 14:20:23Z dchagin $");
29
30#include "namespace.h"
31#include <sys/stat.h>
32
33#include <errno.h>
34#include <fcntl.h>
35#include <time.h>
36#include "un-namespace.h"
37
38#include "libc_private.h"
39
40int
41utimensat(int fd, const char *path, const struct timespec times[2], int flag)
42{
43	struct timeval now, tv[2], *tvp;
44	struct stat sb;
45
46	if (__getosreldate() >= 1100056)
47		return (__sys_utimensat(fd, path, times, flag));
48
49	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) {
50		errno = EINVAL;
51		return (-1);
52	}
53	if (times == NULL || (times[0].tv_nsec == UTIME_NOW &&
54	    times[1].tv_nsec == UTIME_NOW))
55		tvp = NULL;
56	else if (times[0].tv_nsec == UTIME_OMIT &&
57	    times[1].tv_nsec == UTIME_OMIT)
58		return (0);
59	else {
60		if ((times[0].tv_nsec < 0 || times[0].tv_nsec > 999999999) &&
61		    times[0].tv_nsec != UTIME_NOW &&
62		    times[0].tv_nsec != UTIME_OMIT) {
63			errno = EINVAL;
64			return (-1);
65		}
66		if ((times[1].tv_nsec < 0 || times[1].tv_nsec > 999999999) &&
67		    times[1].tv_nsec != UTIME_NOW &&
68		    times[1].tv_nsec != UTIME_OMIT) {
69			errno = EINVAL;
70			return (-1);
71		}
72		tv[0].tv_sec = times[0].tv_sec;
73		tv[0].tv_usec = times[0].tv_nsec / 1000;
74		tv[1].tv_sec = times[1].tv_sec;
75		tv[1].tv_usec = times[1].tv_nsec / 1000;
76		tvp = tv;
77		if (times[0].tv_nsec == UTIME_OMIT ||
78		    times[1].tv_nsec == UTIME_OMIT) {
79			if (fstatat(fd, path, &sb, flag) == -1)
80				return (-1);
81			if (times[0].tv_nsec == UTIME_OMIT) {
82				tv[0].tv_sec = sb.st_atim.tv_sec;
83				tv[0].tv_usec = sb.st_atim.tv_nsec / 1000;
84			}
85			if (times[1].tv_nsec == UTIME_OMIT) {
86				tv[1].tv_sec = sb.st_mtim.tv_sec;
87				tv[1].tv_usec = sb.st_mtim.tv_nsec / 1000;
88			}
89		}
90		if (times[0].tv_nsec == UTIME_NOW ||
91		    times[1].tv_nsec == UTIME_NOW) {
92			if (gettimeofday(&now, NULL) == -1)
93				return (-1);
94			if (times[0].tv_nsec == UTIME_NOW)
95				tv[0] = now;
96			if (times[1].tv_nsec == UTIME_NOW)
97				tv[1] = now;
98		}
99	}
100	if ((flag & AT_SYMLINK_NOFOLLOW) == 0)
101		return (futimesat(fd, path, tvp));
102	else if ((flag & AT_SYMLINK_NOFOLLOW) != 0 &&
103	    (fd == AT_FDCWD || path[0] == '/'))
104		return (lutimes(path, tvp));
105	else {
106		errno = ENOTSUP;
107		return (-1);
108	}
109}
110