1  /* mprotect with a memory protection key.
       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  #include <errno.h>
      20  #include <sys/mman.h>
      21  #include <sys/syscall.h>
      22  #include <sysdep.h>
      23  
      24  int
      25  pkey_mprotect (void *addr, size_t len, int prot, int pkey)
      26  {
      27    if (pkey == -1)
      28      /* If the key is -1, the system call is precisely equivalent to
      29         mprotect.  */
      30      return __mprotect (addr, len, prot);
      31    return INLINE_SYSCALL_CALL (pkey_mprotect, addr, len, prot, pkey);
      32  }