]>
Commit | Line | Data |
---|---|---|
0ecb606c JJ |
1 | /* Copyright (C) 2005, 2006 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
18 | ||
19 | #include <errno.h> | |
20 | #include <fcntl.h> | |
21 | #include <stddef.h> | |
22 | #include <stdio.h> | |
23 | #include <string.h> | |
24 | #include <utime.h> | |
25 | #include <sys/time.h> | |
26 | #include <sysdep.h> | |
27 | #include <kernel-features.h> | |
28 | ||
29 | ||
30 | /* Change the access time of FILE relative to FD to TVP[0] and | |
31 | the modification time of FILE to TVP[1]. */ | |
32 | int | |
33 | futimesat (fd, file, tvp) | |
34 | int fd; | |
35 | const char *file; | |
36 | const struct timeval tvp[2]; | |
37 | { | |
38 | int result; | |
39 | ||
40 | if (file == NULL) | |
41 | return __futimes (fd, tvp); | |
42 | ||
43 | #ifdef __NR_futimesat | |
44 | # ifndef __ASSUME_ATFCTS | |
45 | if (__have_atfcts >= 0) | |
46 | # endif | |
47 | { | |
48 | result = INLINE_SYSCALL (futimesat, 3, fd, file, tvp); | |
49 | # ifndef __ASSUME_ATFCTS | |
50 | if (result == -1 && errno == ENOSYS) | |
51 | __have_atfcts = -1; | |
52 | else | |
53 | # endif | |
54 | return result; | |
55 | } | |
56 | #endif | |
57 | ||
58 | #ifndef __ASSUME_ATFCTS | |
59 | char *buf = NULL; | |
60 | ||
61 | if (fd != AT_FDCWD && file[0] != '/') | |
62 | { | |
63 | size_t filelen = strlen (file); | |
64 | static const char procfd[] = "/proc/self/fd/%d/%s"; | |
65 | /* Buffer for the path name we are going to use. It consists of | |
66 | - the string /proc/self/fd/ | |
67 | - the file descriptor number | |
68 | - the file name provided. | |
69 | The final NUL is included in the sizeof. A bit of overhead | |
70 | due to the format elements compensates for possible negative | |
71 | numbers. */ | |
72 | size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen; | |
73 | buf = alloca (buflen); | |
74 | ||
75 | __snprintf (buf, buflen, procfd, fd, file); | |
76 | file = buf; | |
77 | } | |
78 | ||
79 | INTERNAL_SYSCALL_DECL (err); | |
80 | ||
81 | # ifdef __NR_utimes | |
82 | result = INTERNAL_SYSCALL (utimes, err, 2, file, tvp); | |
83 | if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) | |
84 | return result; | |
85 | ||
86 | # ifndef __ASSUME_UTIMES | |
87 | if (INTERNAL_SYSCALL_ERRNO (result, err) != ENOSYS) | |
88 | goto fail; | |
89 | # endif | |
90 | # endif | |
91 | ||
92 | /* The utimes() syscall does not exist or is not available in the | |
93 | used kernel. Use utime(). For this we have to convert to the | |
94 | data format utime() expects. */ | |
95 | # ifndef __ASSUME_UTIMES | |
96 | struct utimbuf tmp; | |
97 | struct utimbuf *times; | |
98 | ||
99 | if (tvp != NULL) | |
100 | { | |
101 | times = &tmp; | |
102 | tmp.actime = tvp[0].tv_sec + tvp[0].tv_usec / 1000000; | |
103 | tmp.modtime = tvp[1].tv_sec + tvp[1].tv_usec / 1000000; | |
104 | } | |
105 | else | |
106 | times = NULL; | |
107 | ||
108 | result = INTERNAL_SYSCALL (utime, err, 2, file, times); | |
109 | if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) | |
110 | return result; | |
111 | ||
112 | fail: | |
113 | # endif | |
114 | ||
115 | __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf); | |
116 | ||
117 | return -1; | |
118 | #endif | |
119 | } |