1  /* Copyright (C) 2002-2023 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     <https://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  #if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
      28  extern int __sched_getaffinity_new (pid_t, size_t, cpu_set_t *);
      29  libc_hidden_proto (__sched_getaffinity_new)
      30  #endif
      31  
      32  int
      33  __sched_getaffinity_new (pid_t pid, size_t cpusetsize, cpu_set_t *cpuset)
      34  {
      35    int res = INLINE_SYSCALL (sched_getaffinity, 3, pid,
      36  			    MIN (INT_MAX, cpusetsize), cpuset);
      37    if (res != -1)
      38      {
      39        /* Clean the rest of the memory the kernel didn't do.  */
      40        memset ((char *) cpuset + res, '\0', cpusetsize - res);
      41  
      42        res = 0;
      43      }
      44    return res;
      45  }
      46  versioned_symbol (libc, __sched_getaffinity_new, sched_getaffinity,
      47  		  GLIBC_2_3_4);
      48  
      49  
      50  #if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
      51  libc_hidden_def (__sched_getaffinity_new)
      52  
      53  int
      54  attribute_compat_text_section
      55  __sched_getaffinity_old (pid_t pid, cpu_set_t *cpuset)
      56  {
      57    /* The old interface by default assumed a 1024 processor bitmap.  */
      58    return __sched_getaffinity_new (pid, 128, cpuset);
      59  }
      60  compat_symbol (libc, __sched_getaffinity_old, sched_getaffinity, GLIBC_2_3_3);
      61  #endif