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95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <sched.h>
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#include <string.h>
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#include <sysdep.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <shlib-compat.h>
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#include <alloca.h>
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#ifdef __NR_sched_setaffinity
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static size_t __kernel_cpumask_size;
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int
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__sched_setaffinity_new (pid_t pid, size_t cpusetsize, const cpu_set_t *cpuset)
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{
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if (__glibc_unlikely (__kernel_cpumask_size == 0))
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{
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INTERNAL_SYSCALL_DECL (err);
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int res;
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size_t psize = 128;
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void *p = alloca (psize);
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while (res = INTERNAL_SYSCALL (sched_getaffinity, err, 3, getpid (),
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psize, p),
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INTERNAL_SYSCALL_ERROR_P (res, err)
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&& INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL)
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p = extend_alloca (p, psize, 2 * psize);
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if (res == 0 || INTERNAL_SYSCALL_ERROR_P (res, err))
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{
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__set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
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return -1;
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}
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__kernel_cpumask_size = res;
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}
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/* We now know the size of the kernel cpumask_t. Make sure the user
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does not request to set a bit beyond that. */
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for (size_t cnt = __kernel_cpumask_size; cnt < cpusetsize; ++cnt)
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if (((char *) cpuset)[cnt] != '\0')
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{
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/* Found a nonzero byte. This means the user request cannot be
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fulfilled. */
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__set_errno (EINVAL);
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return -1;
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}
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int result = INLINE_SYSCALL (sched_setaffinity, 3, pid, cpusetsize, cpuset);
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#ifdef RESET_VGETCPU_CACHE
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if (result != -1)
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RESET_VGETCPU_CACHE ();
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#endif
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return result;
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}
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versioned_symbol (libc, __sched_setaffinity_new, sched_setaffinity,
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GLIBC_2_3_4);
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# if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
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int
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attribute_compat_text_section
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__sched_setaffinity_old (pid_t pid, const cpu_set_t *cpuset)
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{
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/* The old interface by default assumed a 1024 processor bitmap. */
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return __sched_setaffinity_new (pid, 128, cpuset);
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}
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compat_symbol (libc, __sched_setaffinity_old, sched_setaffinity, GLIBC_2_3_3);
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# endif
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#else
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# include <posix/sched_setaffinity.c>
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#endif
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