1  /* Linux fcntl syscall implementation -- non-cancellable.
       2     Copyright (C) 2018-2023 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 <fcntl.h>
      20  #include <stdarg.h>
      21  #include <errno.h>
      22  #include <sysdep-cancel.h>
      23  #include <not-cancel.h>
      24  
      25  #ifndef __NR_fcntl64
      26  # define __NR_fcntl64 __NR_fcntl
      27  #endif
      28  
      29  #ifndef FCNTL_ADJUST_CMD
      30  # define FCNTL_ADJUST_CMD(__cmd) __cmd
      31  #endif
      32  
      33  int
      34  __fcntl64_nocancel (int fd, int cmd, ...)
      35  {
      36    va_list ap;
      37    void *arg;
      38  
      39    va_start (ap, cmd);
      40    arg = va_arg (ap, void *);
      41    va_end (ap);
      42  
      43    cmd = FCNTL_ADJUST_CMD (cmd);
      44  
      45    return __fcntl64_nocancel_adjusted (fd, cmd, arg);
      46  }
      47  hidden_def (__fcntl64_nocancel)
      48  
      49  int
      50  __fcntl64_nocancel_adjusted (int fd, int cmd, void *arg)
      51  {
      52    if (cmd == F_GETOWN)
      53      {
      54        struct f_owner_ex fex;
      55        int res = INTERNAL_SYSCALL_CALL (fcntl64, fd, F_GETOWN_EX, &fex);
      56        if (!INTERNAL_SYSCALL_ERROR_P (res))
      57  	return fex.type == F_OWNER_GID ? -fex.pid : fex.pid;
      58  
      59        return INLINE_SYSCALL_ERROR_RETURN_VALUE
      60          (INTERNAL_SYSCALL_ERRNO (res));
      61      }
      62  
      63    return INLINE_SYSCALL_CALL (fcntl64, fd, cmd, (void *) arg);
      64  }