hurd/fcntl-internal.h

   1 /* Helper functions for translating between O_* and SOCK_* flags.
   2    Copyright (C) 2008-2023 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
  20 #include <fcntl.h>
  21 #include <sys/socket.h>
  22
  23 /* Do some compile-time checks for the SOCK_* constants, which we rely on.  */
  24 _Static_assert (SOCK_CLOEXEC == O_CLOEXEC,
  25     "SOCK_CLOEXEC is assumed to be the same as O_CLOEXEC");
  26 _Static_assert (((SOCK_MAX - 1) | SOCK_TYPE_MASK) == SOCK_TYPE_MASK,
  27     "SOCK_TYPE_MASK must contain SOCK_MAX - 1");
  28 _Static_assert ((SOCK_CLOEXEC & SOCK_TYPE_MASK) == 0,
  29     "SOCK_TYPE_MASK must not contain SOCK_CLOEXEC");
  30 _Static_assert ((SOCK_NONBLOCK & SOCK_TYPE_MASK) == 0,
  31     "SOCK_TYPE_MASK must not contain SOCK_NONBLOCK");
  32
  33
  34 /* Convert from SOCK_* flags to O_* flags.  */
  35 __extern_always_inline
  36 int
  37 sock_to_o_flags (int in)
  38 {
  39   int out = 0;
  40
  41   if (in & SOCK_NONBLOCK)
  42     out |= O_NONBLOCK;
  43   /* Others are passed through unfiltered.  */
  44   out |= in & ~(SOCK_NONBLOCK);
  45
  46   return out;
  47 }
  48
  49 /* Convert from O_* flags to SOCK_* flags.  */
  50 __extern_always_inline
  51 int
  52 o_to_sock_flags (int in)
  53 {
  54   int out = 0;
  55
  56   if (in & O_NONBLOCK)
  57     out |= SOCK_NONBLOCK;
  58   /* Others are passed through unfiltered.  */
  59   out |= in & ~(O_NONBLOCK);
  60
  61   return out;
  62 }