lib/libc_r/uthread/uthread_attr_getaffinity_np.c

   1 /*
   2  * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by John Birrell.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/types.h>
  34 #include <sys/sysctl.h>
  35
  36 #include <errno.h>
  37 #include <pthread.h>
  38 #include <pthread_np.h>
  39 #include <string.h>
  40 #include "pthread_private.h"
  41
  42 int
  43 _pthread_attr_getaffinity_np(const pthread_attr_t *attr __unused,
  44     size_t cpusetsize, cpu_set_t *mask)
  45 {
  46         cpu_set_t mask1;
  47         size_t len;
  48
  49         len = sizeof(mask1);
  50         if (sysctlbyname("machdep.smp_active", &mask1, &len, NULL, 0) < 0)
  51                 return (errno);
  52
  53         if (cpusetsize > sizeof(mask1)) {
  54                 memset(mask, 0, cpusetsize);
  55                 memcpy(mask, &mask1, sizeof(mask1));
  56         } else {
  57                 memcpy(mask, &mask1, cpusetsize);
  58         }
  59         return (0);
  60 }
  61 __strong_reference(_pthread_attr_getaffinity_np, pthread_attr_getaffinity_np);