1  /* Copyright (C) 2003-2023 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 <limits.h>
      20  #include <pthreadP.h>
      21  #include <string.h>
      22  #include <sysdep.h>
      23  #include <sys/param.h>
      24  #include <sys/types.h>
      25  #include <shlib-compat.h>
      26  
      27  
      28  int
      29  __pthread_getaffinity_np (pthread_t th, size_t cpusetsize, cpu_set_t *cpuset)
      30  {
      31    const struct pthread *pd = (const struct pthread *) th;
      32  
      33    int res = INTERNAL_SYSCALL_CALL (sched_getaffinity, pd->tid,
      34  				   MIN (INT_MAX, cpusetsize), cpuset);
      35    if (INTERNAL_SYSCALL_ERROR_P (res))
      36      return INTERNAL_SYSCALL_ERRNO (res);
      37  
      38    /* Clean the rest of the memory the kernel didn't do.  */
      39    memset ((char *) cpuset + res, '\0', cpusetsize - res);
      40  
      41    return 0;
      42  }
      43  libc_hidden_def (__pthread_getaffinity_np)
      44  versioned_symbol (libc, __pthread_getaffinity_np, pthread_getaffinity_np,
      45  		  GLIBC_2_32);
      46  
      47  #if SHLIB_COMPAT (libc, GLIBC_2_3_4, GLIBC_2_32)
      48  strong_alias (__pthread_getaffinity_np, __pthread_getaffinity_alias)
      49  compat_symbol (libc, __pthread_getaffinity_alias, pthread_getaffinity_np,
      50  	       GLIBC_2_3_4);
      51  #endif
      52  
      53  #if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
      54  int
      55  __pthread_getaffinity_old (pthread_t th, cpu_set_t *cpuset)
      56  {
      57    /* The old interface by default assumed a 1024 processor bitmap.  */
      58    return __pthread_getaffinity_np (th, 128, cpuset);
      59  }
      60  compat_symbol (libc, __pthread_getaffinity_old, pthread_getaffinity_np,
      61  	       GLIBC_2_3_3);
      62  #endif