1 /* Copyright (C) 2002-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
23 #include <sys/types.h>
24 #include <shlib-compat.h>
28 #ifdef __NR_sched_setaffinity
29 static size_t __kernel_cpumask_size
;
33 __sched_setaffinity_new (pid_t pid
, size_t cpusetsize
, const cpu_set_t
*cpuset
)
35 if (__glibc_unlikely (__kernel_cpumask_size
== 0))
37 INTERNAL_SYSCALL_DECL (err
);
41 void *p
= alloca (psize
);
43 while (res
= INTERNAL_SYSCALL (sched_getaffinity
, err
, 3, getpid (),
45 INTERNAL_SYSCALL_ERROR_P (res
, err
)
46 && INTERNAL_SYSCALL_ERRNO (res
, err
) == EINVAL
)
47 p
= extend_alloca (p
, psize
, 2 * psize
);
49 if (res
== 0 || INTERNAL_SYSCALL_ERROR_P (res
, err
))
51 __set_errno (INTERNAL_SYSCALL_ERRNO (res
, err
));
55 __kernel_cpumask_size
= res
;
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')
63 /* Found a nonzero byte. This means the user request cannot be
69 int result
= INLINE_SYSCALL (sched_setaffinity
, 3, pid
, cpusetsize
, cpuset
);
71 #ifdef RESET_VGETCPU_CACHE
73 RESET_VGETCPU_CACHE ();
78 versioned_symbol (libc
, __sched_setaffinity_new
, sched_setaffinity
,
82 # if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
84 attribute_compat_text_section
85 __sched_setaffinity_old (pid_t pid
, const cpu_set_t
*cpuset
)
87 /* The old interface by default assumed a 1024 processor bitmap. */
88 return __sched_setaffinity_new (pid
, 128, cpuset
);
90 compat_symbol (libc
, __sched_setaffinity_old
, sched_setaffinity
, GLIBC_2_3_3
);
93 # include <posix/sched_setaffinity.c>