/* Linux fcntl syscall implementation.

   Copyright (C) 2000-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <fcntl.h>

#include <stdarg.h>

#include <errno.h>

#include <sysdep-cancel.h>

#ifndef __OFF_T_MATCHES_OFF64_T

# ifndef FCNTL_ADJUST_CMD

#  define FCNTL_ADJUST_CMD(__cmd) __cmd

# endif

int

__libc_fcntl (int fd, int cmd, ...)

{

  va_list ap;

  void *arg;

  va_start (ap, cmd);

  arg = va_arg (ap, void *);

  va_end (ap);

  cmd = FCNTL_ADJUST_CMD (cmd);

  switch (cmd)

    {

      case F_SETLKW:

      case F_SETLKW64:

	return SYSCALL_CANCEL (fcntl64, fd, cmd, arg);

      case F_OFD_SETLKW:

	{

	  struct flock *flk = (struct flock *) arg;

	  struct flock64 flk64 =

	  {

	    .l_type = flk->l_type,

	    .l_whence = flk->l_whence,

	    .l_start = flk->l_start,

	    .l_len = flk->l_len,

	    .l_pid = flk->l_pid

	  };

	  return SYSCALL_CANCEL (fcntl64, fd, cmd, &flk64);

	}

      case F_OFD_GETLK:

      case F_OFD_SETLK:

	{

	  struct flock *flk = (struct flock *) arg;

	  struct flock64 flk64 =

	  {

	    .l_type = flk->l_type,

	    .l_whence = flk->l_whence,

	    .l_start = flk->l_start,

	    .l_len = flk->l_len,

	    .l_pid = flk->l_pid

	  };

	  int ret = INLINE_SYSCALL_CALL (fcntl64, fd, cmd, &flk64);

	  if (ret == -1)

	    return -1;

	  if ((off_t) flk64.l_start != flk64.l_start

	      || (off_t) flk64.l_len != flk64.l_len)

	    {

	      __set_errno (EOVERFLOW);

	      return -1;

	    }

	  flk->l_type = flk64.l_type;

	  flk->l_whence = flk64.l_whence;

	  flk->l_start = flk64.l_start;

	  flk->l_len = flk64.l_len;

	  flk->l_pid = flk64.l_pid;

	  return ret;

	}

      /* Since only F_SETLKW{64}/F_OLD_SETLK are cancellation entrypoints and

	 only OFD locks require LFS handling, all others flags are handled

	 unmodified by calling __NR_fcntl64.  */

      default:

        return __fcntl64_nocancel_adjusted (fd, cmd, arg);

    }

}

libc_hidden_def (__libc_fcntl)

weak_alias (__libc_fcntl, __fcntl)

libc_hidden_weak (__fcntl)

# include <shlib-compat.h>

# if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_28)

int

__old_libc_fcntl64 (int fd, int cmd, ...)

{

  va_list ap;

  void *arg;

  va_start (ap, cmd);

  arg = va_arg (ap, void *);

  va_end (ap);

  /* Previous versions called __NR_fcntl64 for fcntl (which did not handle

     OFD locks in LFS mode).  */

  return __libc_fcntl64 (fd, cmd, arg);

}

compat_symbol (libc, __old_libc_fcntl64, fcntl, GLIBC_2_0);

versioned_symbol (libc, __libc_fcntl, fcntl, GLIBC_2_28);

# else

weak_alias (__libc_fcntl, fcntl)

# endif

#endif /* __OFF_T_MATCHES_OFF64_T  */