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  }