uclibc-ng/libpthread/nptl/sysdeps/unix/sysv/linux/pthread_attr_getaffinity.c

/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.

   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 <assert.h>
#include <errno.h>
#include <pthreadP.h>
#include <string.h>
#include <sysdep.h>
#include <sys/types.h>


int
pthread_attr_getaffinity_np(const pthread_attr_t *attr, size_t cpusetsize,
				cpu_set_t *cpuset)
{
  const struct pthread_attr *iattr;

  assert (sizeof (*attr) >= sizeof (struct pthread_attr));
  iattr = (const struct pthread_attr *) attr;

  if (iattr->cpuset != NULL)
    {
      /* Check whether there are any bits set beyond the limits
	 the user requested.  */
      size_t cnt;
      for (cnt = cpusetsize; cnt < iattr->cpusetsize; ++cnt)
	if (((char *) iattr->cpuset)[cnt] != 0)
	  return EINVAL;

      void *p = mempcpy (cpuset, iattr->cpuset, iattr->cpusetsize);
      if (cpusetsize > iattr->cpusetsize)
	memset (p, '\0', cpusetsize - iattr->cpusetsize);
    }
  else
    /* We have no information.  */
    memset (cpuset, -1, cpusetsize);

  return 0;
}