settimeofday.c revision 1.10 1 1.10 kardel /* $NetBSD: settimeofday.c,v 1.10 2006/10/07 20:02:01 kardel Exp $ */
2 1.1 manu
3 1.1 manu /*
4 1.1 manu * Copyright (c) 2001 The NetBSD Foundation, Inc.
5 1.1 manu * All rights reserved.
6 1.1 manu *
7 1.1 manu * This code is derived from software contributed to The NetBSD Foundation
8 1.1 manu * by Emmanuel Dreyfus.
9 1.1 manu *
10 1.1 manu * Redistribution and use in source and binary forms, with or without
11 1.1 manu * modification, are permitted provided that the following conditions
12 1.1 manu * are met:
13 1.1 manu * 1. Redistributions of source code must retain the above copyright
14 1.1 manu * notice, this list of conditions and the following disclaimer.
15 1.1 manu * 2. Redistributions in binary form must reproduce the above copyright
16 1.1 manu * notice, this list of conditions and the following disclaimer in the
17 1.1 manu * documentation and/or other materials provided with the distribution.
18 1.1 manu * 3. The name of the author may not be used to endorse or promote products
19 1.1 manu * derived from this software without specific prior written permission.
20 1.1 manu *
21 1.1 manu * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 1.1 manu * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 1.1 manu * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 1.1 manu * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 1.1 manu * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 1.1 manu * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 1.1 manu * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 1.1 manu * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 1.1 manu * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 1.1 manu * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 1.1 manu * SUCH DAMAGE.
32 1.1 manu */
33 1.1 manu
34 1.7 lukem #include <sys/cdefs.h>
35 1.7 lukem #if defined(LIBC_SCCS) && !defined(lint)
36 1.10 kardel __RCSID("$NetBSD: settimeofday.c,v 1.10 2006/10/07 20:02:01 kardel Exp $");
37 1.7 lukem #endif /* LIBC_SCCS and not lint */
38 1.7 lukem
39 1.1 manu #include "namespace.h"
40 1.2 thorpej
41 1.1 manu #include <sys/types.h>
42 1.1 manu #include <sys/ioctl.h>
43 1.1 manu #include <sys/syscall.h>
44 1.3 manu
45 1.1 manu #include <sys/clockctl.h>
46 1.2 thorpej
47 1.3 manu #include <errno.h>
48 1.2 thorpej #include <fcntl.h>
49 1.2 thorpej #include <paths.h>
50 1.2 thorpej #include <string.h>
51 1.2 thorpej #include <time.h>
52 1.2 thorpej #include <unistd.h>
53 1.1 manu
54 1.1 manu #ifdef __weak_alias
55 1.1 manu __weak_alias(settimeofday,_settimeofday)
56 1.1 manu #endif
57 1.1 manu
58 1.10 kardel int __clockctl_fd = -1;
59 1.3 manu
60 1.1 manu int
61 1.1 manu settimeofday(tv, tzp)
62 1.1 manu const struct timeval *tv;
63 1.6 kleink const void *tzp;
64 1.1 manu {
65 1.8 christos struct clockctl_settimeofday args;
66 1.1 manu quad_t q;
67 1.1 manu int rv;
68 1.1 manu
69 1.3 manu /*
70 1.10 kardel * try syscal first and attempt to switch to clockctl
71 1.10 kardel * if that fails with EPERM
72 1.3 manu */
73 1.3 manu if (__clockctl_fd == -1) {
74 1.3 manu q = __syscall((quad_t)SYS_settimeofday, tv, tzp);
75 1.3 manu if (/* LINTED constant */ sizeof (quad_t) == sizeof (register_t)
76 1.3 manu || /* LINTED constant */ BYTE_ORDER == LITTLE_ENDIAN)
77 1.3 manu rv = (int)q;
78 1.3 manu else
79 1.3 manu rv = (int)((u_quad_t)q >> 32);
80 1.3 manu
81 1.3 manu /*
82 1.10 kardel * switch to clockctl if we fail with EPERM, this
83 1.10 kardel * may be cause by an attempt to set the time backwards
84 1.10 kardel * but we should leave the access permission checking
85 1.10 kardel * entirely to the kernel
86 1.3 manu */
87 1.10 kardel if (rv != -1 || errno != EPERM)
88 1.3 manu return rv;
89 1.3 manu
90 1.10 kardel __clockctl_fd = open(_PATH_CLOCKCTL, O_WRONLY, 0);
91 1.10 kardel if (__clockctl_fd == -1) {
92 1.10 kardel /* original error was EPERM - don't leak open errors */
93 1.10 kardel errno = EPERM;
94 1.10 kardel return -1;
95 1.3 manu }
96 1.3 manu
97 1.5 cb (void) fcntl(__clockctl_fd, F_SETFD, FD_CLOEXEC);
98 1.3 manu }
99 1.1 manu
100 1.1 manu /*
101 1.3 manu * If __clockctl_fd >=0, clockctl has already been open
102 1.3 manu * and used, so we carry on using it.
103 1.1 manu */
104 1.8 christos args.tv = tv;
105 1.8 christos args.tzp = tzp;
106 1.10 kardel return ioctl(__clockctl_fd, CLOCKCTL_SETTIMEOFDAY, &args);
107 1.1 manu }
108