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ad0e8eb0 | 1 | /* Get file-specific information about a file. Linux version. |
d024596d | 2 | Copyright (C) 2003, 2004 Free Software Foundation, Inc. |
ad0e8eb0 UD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
d024596d | 20 | #include <fcntl.h> |
ad0e8eb0 UD |
21 | #include <sysdep.h> |
22 | #include <time.h> | |
23 | #include <unistd.h> | |
5db7adc4 | 24 | #include <not-cancel.h> |
ad0e8eb0 UD |
25 | |
26 | static long int posix_sysconf (int name); | |
27 | ||
28 | /* Define this first, so it can be inlined. */ | |
29 | #define __sysconf static posix_sysconf | |
30 | #include <sysdeps/posix/sysconf.c> | |
31 | ||
32 | ||
33 | /* Get the value of the system variable NAME. */ | |
34 | long int | |
35 | __sysconf (int name) | |
36 | { | |
37 | switch (name) | |
38 | { | |
39 | #ifdef __NR_clock_getres | |
40 | case _SC_MONOTONIC_CLOCK: | |
41 | /* Check using the clock_getres system call. */ | |
42 | { | |
43 | struct timespec ts; | |
44 | INTERNAL_SYSCALL_DECL (err); | |
d15851ec RM |
45 | int r; |
46 | r = INTERNAL_SYSCALL (clock_getres, err, 2, CLOCK_MONOTONIC, &ts); | |
0ebde03a | 47 | return INTERNAL_SYSCALL_ERROR_P (r, err) ? -1 : 1; |
ad0e8eb0 UD |
48 | } |
49 | #endif | |
50 | ||
d024596d UD |
51 | case _SC_NGROUPS_MAX: |
52 | { | |
53 | /* Try to read the information from the /proc/sys/kernel/ngroups_max | |
54 | file. */ | |
5db7adc4 | 55 | int fd = open_not_cancel_2 ("/proc/sys/kernel/ngroups_max", O_RDONLY); |
d024596d UD |
56 | if (fd != -1) |
57 | { | |
58 | /* This is more than enough, the file contains a single | |
59 | integer. */ | |
60 | char buf[32]; | |
5db7adc4 UD |
61 | ssize_t n; |
62 | n = TEMP_FAILURE_RETRY (read_not_cancel (fd, buf, | |
63 | sizeof (buf) - 1)); | |
64 | close_not_cancel_no_status (fd); | |
d024596d | 65 | |
d024596d UD |
66 | if (n > 0) |
67 | { | |
68 | /* Terminate the string. */ | |
69 | buf[n] = '\0'; | |
70 | ||
71 | char *endp; | |
5db7adc4 UD |
72 | long int res = strtol (buf, &endp, 10); |
73 | if (endp != buf && (*endp == '\0' || *endp == '\n')) | |
74 | return res; | |
d024596d | 75 | } |
d024596d UD |
76 | } |
77 | } | |
78 | break; | |
79 | ||
ad0e8eb0 | 80 | default: |
d024596d | 81 | break; |
ad0e8eb0 | 82 | } |
d024596d | 83 | return posix_sysconf (name); |
ad0e8eb0 | 84 | } |