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26cec518 UD |
1 | /* Copyright (C) 2005 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 <utime.h> | |
24 | #include <sys/time.h> | |
25 | #include <sysdep.h> | |
26 | #include "kernel-features.h" | |
27 | ||
28 | ||
29 | /* Change the access time of FILE relative to FD to TVP[0] and | |
30 | the modification time of FILE to TVP[1]. */ | |
31 | int | |
32 | futimesat (fd, file, tvp) | |
33 | int fd; | |
34 | const char *file; | |
35 | const struct timeval tvp[2]; | |
36 | { | |
37 | char *buf = NULL; | |
38 | ||
39 | if (fd != AT_FDCWD && file[0] != '/') | |
40 | { | |
41 | size_t filelen = strlen (file); | |
42 | static const char procfd[] = "/proc/self/fd/%d/%s"; | |
43 | /* Buffer for the path name we are going to use. It consists of | |
44 | - the string /proc/self/fd/ | |
45 | - the file descriptor number | |
46 | - the file name provided. | |
47 | The final NUL is included in the sizeof. A bit of overhead | |
48 | due to the format elements compensates for possible negative | |
49 | numbers. */ | |
50 | size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen; | |
51 | buf = alloca (buflen); | |
52 | ||
53 | __snprintf (buf, buflen, procfd, fd, file); | |
54 | file = buf; | |
55 | } | |
56 | ||
57 | int result; | |
58 | INTERNAL_SYSCALL_DECL (err); | |
59 | ||
60 | #ifdef __NR_utimes | |
61 | result = INTERNAL_SYSCALL (utimes, err, 2, file, tvp); | |
62 | if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) | |
63 | return result; | |
64 | ||
65 | # ifndef __ASSUME_UTIMES | |
66 | if (INTERNAL_SYSCALL_ERRNO (result, err) != ENOSYS) | |
67 | goto fail; | |
68 | # endif | |
69 | #endif | |
70 | ||
71 | /* The utimes() syscall does not exist or is not available in the | |
72 | used kernel. Use utime(). For this we have to convert to the | |
73 | data format utime() expects. */ | |
74 | #ifndef __ASSUME_UTIMES | |
75 | struct utimbuf tmp; | |
76 | struct utimbuf *times; | |
77 | ||
78 | if (tvp != NULL) | |
79 | { | |
80 | times = &tmp; | |
81 | tmp.actime = tvp[0].tv_sec + tvp[0].tv_usec / 1000000; | |
82 | tmp.modtime = tvp[1].tv_sec + tvp[1].tv_usec / 1000000; | |
83 | } | |
84 | else | |
85 | times = NULL; | |
86 | ||
87 | result = INTERNAL_SYSCALL (utime, err, 2, file, times); | |
88 | if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) | |
89 | return result; | |
90 | ||
91 | fail: | |
92 | #endif | |
93 | ||
94 | __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf); | |
95 | ||
96 | return -1; | |
97 | } |