sysdeps/unix/sysv/linux/sched_getaffinity.c

   1 /* Copyright (C) 2002-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   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.
   8
   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.
  13
  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/>.  */
  17
  18 #include <errno.h>
  19 #include <sched.h>
  20 #include <string.h>
  21 #include <sysdep.h>
  22 #include <sys/param.h>
  23 #include <sys/types.h>
  24 #include <shlib-compat.h>
  25
  26
  27 #ifdef __NR_sched_getaffinity
  28 int
  29 __sched_getaffinity_new (pid_t pid, size_t cpusetsize, cpu_set_t *cpuset)
  30 {
  31   int res = INLINE_SYSCALL (sched_getaffinity, 3, pid,
  32                             MIN (INT_MAX, cpusetsize), cpuset);
  33   if (res != -1)
  34     {
  35       /* Clean the rest of the memory the kernel didn't do.  */
  36       memset ((char *) cpuset + res, '\0', cpusetsize - res);
  37
  38       res = 0;
  39     }
  40   return res;
  41 }
  42 versioned_symbol (libc, __sched_getaffinity_new, sched_getaffinity,
  43                   GLIBC_2_3_4);
  44
  45
  46 # if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
  47 int
  48 attribute_compat_text_section
  49 __sched_getaffinity_old (pid_t pid, cpu_set_t *cpuset)
  50 {
  51   /* The old interface by default assumed a 1024 processor bitmap.  */
  52   return __sched_getaffinity_new (pid, 128, cpuset);
  53 }
  54 compat_symbol (libc, __sched_getaffinity_old, sched_getaffinity, GLIBC_2_3_3);
  55 # endif
  56 #else
  57 # include <posix/sched_getaffinity.c>
  58 #endif