gmon/profil.c

   1 /* Low-level statistical profiling support function.  Stub version.
   2    Copyright (C) 1995-2021 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)