1  /* Low-level statistical profiling support function.  Stub version.
       2     Copyright (C) 1995-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <sys/types.h>
      20  #include <unistd.h>
      21  #include <errno.h>
      22  
      23  /* Enable statistical profiling, writing samples of the PC into at most
      24     SIZE bytes of SAMPLE_BUFFER; every processor clock tick while profiling
      25     is enabled, the system examines the user PC and increments
      26     SAMPLE_BUFFER[((PC - OFFSET) / 2) * SCALE / 65536].  If SCALE is zero,
      27     disable profiling.  Returns zero on success, -1 on error.  */
      28  
      29  int
      30  __profil (u_short *sample_buffer, size_t size, size_t offset, u_int scale)
      31  {
      32    if (scale == 0)
      33      /* Disable profiling.  */
      34      return 0;
      35  
      36    __set_errno (ENOSYS);
      37    return -1;
      38  }
      39  weak_alias (__profil, profil)
      40  stub_warning (profil)