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| 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 |
| 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 | } |
| 63 |
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