sysdeps/unix/sysv/linux/startup.h

   1 /* Linux definitions of functions used by static libc main startup.
   2    Copyright (C) 2017-2023 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 #ifdef SHARED
  20 # include_next <startup.h>
  21 #else
  22 # include <sysdep.h>
  23
  24 /* Avoid a run-time invocation of strlen.  */
  25 #define _startup_fatal(message)                                         \
  26   do                                                                    \
  27     {                                                                   \
  28       size_t __message_length = __builtin_strlen (message);             \
  29       if (! __builtin_constant_p (__message_length))                    \
  30         {                                                               \
  31           extern void _startup_fatal_not_constant (void);               \
  32           _startup_fatal_not_constant ();                               \
  33         }                                                               \
  34       INTERNAL_SYSCALL_CALL (write, STDERR_FILENO, (message),           \
  35                              __message_length);                         \
  36       INTERNAL_SYSCALL_CALL (exit_group, 127);                          \
  37     }                                                                   \
  38   while (0)
  39 #endif  /* !SHARED */