1 /* Helper functions for translating between O_* and SOCK_* flags. 2 Copyright (C) 2008-2022 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 sock_to_o_flags(int in)37sock_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 o_to_sock_flags(int in)52o_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 } 63