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/* Validate cpu_set_t values for NPTL. Linux version.
Copyright (C) 2002-2015 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, see
<http://www.gnu.org/licenses/>. */
#include <pthread.h>
#include <errno.h>
/* Defined in pthread_setaffinity.c. */
extern size_t __kernel_cpumask_size attribute_hidden;
extern int __determine_cpumask_size (pid_t tid);
/* Returns 0 if CS and SZ are valid values for the cpuset and cpuset size
respectively. Otherwise it returns an error number. */
static inline int
check_cpuset_attr (const cpu_set_t *cs, const size_t sz)
{
if (__kernel_cpumask_size == 0)
{
int res = __determine_cpumask_size (THREAD_SELF->tid);
if (res)
return res;
}
/* Check whether the new bitmask has any bit set beyond the
last one the kernel accepts. */
for (size_t cnt = __kernel_cpumask_size; cnt < sz; ++cnt)
if (((char *) cs)[cnt] != '\0')
/* Found a nonzero byte. This means the user request cannot be
fulfilled. */
return EINVAL;
return 0;
}
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