1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/* futimes -- change access and modification times of open file. Linux version.
Copyright (C) 2002,2003,2005,2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <errno.h>
#include <sysdep.h>
#include <string.h>
#include <time.h>
#include <utime.h>
#include <sys/time.h>
#include <stdio-common/_itoa.h>
#include <fcntl.h>
#include <kernel-features.h>
#ifndef __ASSUME_UTIMENSAT
static int miss_utimensat;
#endif
/* Change the access time of the file associated with FD to TVP[0] and
the modification time of FILE to TVP[1].
Starting with 2.6.22 the Linux kernel has the utimensat syscall which
can be used to implement futimes. Earlier kernels have no futimes()
syscall so we use the /proc filesystem. */
int
__futimes (int fd, const struct timeval tvp[2])
{
/* The utimensat system call expects timespec not timeval. */
struct timespec ts[2];
if (tvp != NULL)
{
if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000
|| tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
{
__set_errno (EINVAL);
return -1;
}
TIMEVAL_TO_TIMESPEC (&tvp[0], &ts[0]);
TIMEVAL_TO_TIMESPEC (&tvp[1], &ts[1]);
}
#ifdef __ASSUME_UTIMENSAT
return INLINE_SYSCALL (utimensat, 4, fd, NULL, tvp ? &ts : NULL, 0);
#else
int result;
# ifdef __NR_utimensat
if (!__builtin_expect (miss_utimensat, 0))
{
result = INLINE_SYSCALL (utimensat, 4, fd, NULL, tvp ? &ts : NULL, 0);
if (__builtin_expect (result, 0) != -1 || errno != ENOSYS)
return result;
miss_utimensat = 1;
}
# endif
static const char selffd[] = "/proc/self/fd/";
char fname[sizeof (selffd) + 3 * sizeof (int)];
fname[sizeof (fname) - 1] = '\0';
char *cp = _itoa_word ((unsigned int) fd, fname + sizeof (fname) - 1, 10, 0);
cp = memcpy (cp - sizeof (selffd) + 1, selffd, sizeof (selffd) - 1);
# ifdef __NR_utimes
result = INLINE_SYSCALL (utimes, 2, cp, tvp);
# ifndef __ASSUME_UTIMES
if (result == -1 && errno == ENOSYS)
# endif
# endif
{
/* The utimes() syscall does not exist or is not available in the
used kernel. Use utime(). For this we have to convert to the
data format utime() expects. */
# ifndef __ASSUME_UTIMES
struct utimbuf buf;
struct utimbuf *times;
if (tvp != NULL)
{
times = &buf;
buf.actime = tvp[0].tv_sec + (tvp[0].tv_usec + 500000) / 1000000;
buf.modtime = tvp[1].tv_sec + (tvp[1].tv_usec + 500000) / 1000000;
}
else
times = NULL;
result = INLINE_SYSCALL (utime, 2, cp, times);
# endif
}
if (result == -1)
/* Check for errors that result from failing to find /proc.
This means we can't do futimes at all, so return ENOSYS
rather than some confusing error. */
switch (errno)
{
case EACCES:
if (tvp == NULL) /* Could be a path problem or a file problem. */
break;
/*FALLTHROUGH*/
case ELOOP:
case ENAMETOOLONG:
case ENOTDIR:
__set_errno (ENOSYS);
break;
case ENOENT:
/* Validate the file descriptor by letting fcntl set errno to
EBADF if it's bogus. Otherwise it's a /proc issue. */
# if !defined __NR_fcntl && defined __NR_fcntl64
# define __NR_fcntl __NR_fcntl64
# endif
if (INLINE_SYSCALL (fcntl, 3, fd, F_GETFD, 0) != -1)
__set_errno (ENOSYS);
break;
}
return result;
#endif
}
weak_alias (__futimes, futimes)
|
