/* Helper functions for translating between O_* and SOCK_* flags.

   Copyright (C) 2008-2018 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

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

#include <fcntl.h>

#include <sys/socket.h>

/* Do some compile-time checks for the SOCK_* constants, which we rely on.  */

_Static_assert (SOCK_CLOEXEC == O_CLOEXEC,

    "SOCK_CLOEXEC is assumed to be the same as O_CLOEXEC");

_Static_assert (((SOCK_MAX - 1) | SOCK_TYPE_MASK) == SOCK_TYPE_MASK,

    "SOCK_TYPE_MASK must contain SOCK_MAX - 1");

_Static_assert ((SOCK_CLOEXEC & SOCK_TYPE_MASK) == 0,

    "SOCK_TYPE_MASK must not contain SOCK_CLOEXEC");

_Static_assert ((SOCK_NONBLOCK & SOCK_TYPE_MASK) == 0,

    "SOCK_TYPE_MASK must not contain SOCK_NONBLOCK");

/* Convert from SOCK_* flags to O_* flags.  */

__extern_always_inline

int

sock_to_o_flags (int in)

{

  int out = 0;

  if (in & SOCK_NONBLOCK)

    out |= O_NONBLOCK;

  /* Others are passed through unfiltered.  */

  out |= in & ~(SOCK_NONBLOCK);

  return out;

}

/* Convert from O_* flags to SOCK_* flags.  */

__extern_always_inline

int

o_to_sock_flags (int in)

{

  int out = 0;

  if (in & O_NONBLOCK)

    out |= SOCK_NONBLOCK;

  /* Others are passed through unfiltered.  */

  out |= in & ~(O_NONBLOCK);

  return out;

}