sysdeps/unix/sysv/linux/sysconf-sigstksz.h

   1 /* sysconf_sigstksz ().  Linux version.
   2    Copyright (C) 2020-2024 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 /* Return sysconf (_SC_SIGSTKSZ).  */
  20
  21 static long int
  22 sysconf_sigstksz (void)
  23 {
  24   long int minsigstacksize = GLRO(dl_minsigstacksize);
  25   assert (minsigstacksize != 0);
  26   _Static_assert (__builtin_constant_p (MINSIGSTKSZ),
  27                   "MINSIGSTKSZ is constant");
  28   if (minsigstacksize < MINSIGSTKSZ)
  29     minsigstacksize = MINSIGSTKSZ;
  30   /* MAX (MINSIGSTKSZ, sysconf (_SC_MINSIGSTKSZ)) * 4.  */
  31   long int sigstacksize = minsigstacksize * 4;
  32   /* Return MAX (SIGSTKSZ, sigstacksize).  */
  33   _Static_assert (__builtin_constant_p (SIGSTKSZ),
  34                   "SIGSTKSZ is constant");
  35   if (sigstacksize < SIGSTKSZ)
  36     sigstacksize = SIGSTKSZ;
  37   return sigstacksize;
  38 }