sysdeps/unix/sysv/linux/prctl.c

   1 /* prctl - Linux specific syscall.
   2    Copyright (C) 2020-2023 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 <sysdep.h>
  20 #include <stdarg.h>
  21 #include <sys/prctl.h>
  22
  23 /* Unconditionally read all potential arguments.  This may pass
  24    garbage values to the kernel, but avoids the need for teaching
  25    glibc the argument counts of individual options (including ones
  26    that are added to the kernel in the future).  */
  27
  28 int
  29 __prctl (int option, ...)
  30 {
  31   va_list arg;
  32   va_start (arg, option);
  33   unsigned long int arg2 = va_arg (arg, unsigned long int);
  34   unsigned long int arg3 = va_arg (arg, unsigned long int);
  35   unsigned long int arg4 = va_arg (arg, unsigned long int);
  36   unsigned long int arg5 = va_arg (arg, unsigned long int);
  37   va_end (arg);
  38   return INLINE_SYSCALL_CALL (prctl, option, arg2, arg3, arg4, arg5);
  39 }
  40
  41 libc_hidden_def (__prctl)
  42 weak_alias (__prctl, prctl)
  43 #if __TIMESIZE != 64
  44 weak_alias (__prctl, __prctl_time64)
  45 #endif