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
|
/* Copyright (C) 2002, 2003, 2004, 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 <features.h>
#ifdef __USE_GNU
#include <sched.h>
#include <sys/types.h>
#include <sys/syscall.h>
#ifdef INTERNAL_SYSCALL /* remove this when all archs has this #defined */
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <alloca.h>
#if defined __NR_sched_setaffinity
libc_hidden_proto(getpid)
#define __NR___syscall_sched_setaffinity __NR_sched_setaffinity
static __inline__ _syscall3(int, __syscall_sched_setaffinity, __kernel_pid_t, pid,
size_t, cpusetsize, cpu_set_t *, cpuset);
static size_t __kernel_cpumask_size;
int sched_setaffinity(pid_t pid, size_t cpusetsize, const cpu_set_t *cpuset)
{
size_t cnt;
if (unlikely (__kernel_cpumask_size == 0)) {
INTERNAL_SYSCALL_DECL (err);
int res;
size_t psize = 128;
void *p = alloca (psize);
while (res = INTERNAL_SYSCALL (sched_getaffinity, err, 3, getpid (),
psize, p),
INTERNAL_SYSCALL_ERROR_P (res, err)
&& INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL)
p = extend_alloca (p, psize, 2 * psize);
if (res == 0 || INTERNAL_SYSCALL_ERROR_P (res, err)) {
__set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
return -1;
}
__kernel_cpumask_size = res;
}
/* We now know the size of the kernel cpumask_t. Make sure the user
does not request to set a bit beyond that. */
for (cnt = __kernel_cpumask_size; cnt < cpusetsize; ++cnt)
if (((char *) cpuset)[cnt] != '\0') {
/* Found a nonzero byte. This means the user request cannot be
fulfilled. */
__set_errno (EINVAL);
return -1;
}
return INLINE_SYSCALL (sched_setaffinity, 3, pid, cpusetsize, cpuset);
}
#else
#define ___HAVE_NO_sched_setaffinity
#endif
#else
#define ___HAVE_NO_sched_setaffinity
#endif
#if defined ___HAVE_NO_sched_setaffinity && defined __UCLIBC_HAS_STUBS__
int sched_setaffinity(pid_t pid, size_t cpusetsize, cpu_set_t *cpuset)
{
__set_errno(ENOSYS);
return -1;
}
#endif
#endif /* __USE_GNU */
|
