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439ff07b | 1 | /* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc. |
949ec764 UD |
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 <sched.h> | |
21 | #include <string.h> | |
22 | #include <sysdep.h> | |
439ff07b | 23 | #include <unistd.h> |
949ec764 | 24 | #include <sys/types.h> |
439ff07b | 25 | #include <shlib-compat.h> |
949ec764 UD |
26 | |
27 | ||
28 | #ifdef __NR_sched_setaffinity | |
439ff07b UD |
29 | static size_t __kernel_cpumask_size; |
30 | ||
31 | ||
32 | int | |
33 | __sched_setaffinity_new (pid_t pid, size_t cpusetsize, const cpu_set_t *cpuset) | |
34 | { | |
35 | if (__builtin_expect (__kernel_cpumask_size == 0, 0)) | |
36 | { | |
37 | INTERNAL_SYSCALL_DECL (err); | |
38 | int res; | |
39 | ||
40 | size_t psize = 128; | |
41 | void *p = alloca (psize); | |
42 | ||
43 | while (res = INTERNAL_SYSCALL (sched_getaffinity, err, 3, getpid (), | |
44 | psize, p), | |
45 | INTERNAL_SYSCALL_ERROR_P (res, err) | |
46 | && INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL) | |
47 | p = extend_alloca (p, psize, 2 * psize); | |
48 | ||
49 | if (res == 0 || INTERNAL_SYSCALL_ERROR_P (res, err)) | |
50 | { | |
51 | __set_errno (INTERNAL_SYSCALL_ERRNO (res, err)); | |
52 | return -1; | |
53 | } | |
54 | ||
55 | __kernel_cpumask_size = res; | |
56 | } | |
57 | ||
58 | /* We now know the size of the kernel cpumask_t. Make sure the user | |
59 | does not request to set a bit beyond that. */ | |
60 | for (size_t cnt = __kernel_cpumask_size; cnt < cpusetsize; ++cnt) | |
61 | if (((char *) cpuset)[cnt] != '\0') | |
62 | /* Found a nonzero byte. This means the user request cannot be | |
63 | fulfilled. */ | |
64 | return EINVAL; | |
65 | ||
66 | return INLINE_SYSCALL (sched_setaffinity, 3, pid, cpusetsize, cpuset); | |
67 | } | |
68 | versioned_symbol (libc, __sched_setaffinity_new, sched_setaffinity, | |
69 | GLIBC_2_3_4); | |
70 | ||
71 | ||
72 | # if SHLIB_COMPAT(libc, 2_3_3, 2_3_4) | |
949ec764 | 73 | int |
439ff07b UD |
74 | attribute_compat_text_section |
75 | __sched_setaffinity_old (const pthread_attr_t *attr, const cpu_set_t *cpuset) | |
949ec764 | 76 | { |
439ff07b UD |
77 | /* The old interface by default assumed a 1024 processor bitmap. */ |
78 | return __sched_setaffinity_new (attr, 128, cpuset); | |
949ec764 | 79 | } |
439ff07b UD |
80 | compat_symbol (libc, __sched_setaffinity_old, sched_setaffinity, GLIBC_2_3_3); |
81 | # endif | |
949ec764 UD |
82 | #else |
83 | # include <sysdeps/generic/sched_setaffinity.c> | |
84 | #endif |