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84814e2a 1/* Helper functions for translating between O_* and SOCK_* flags.
04277e02 2 Copyright (C) 2008-2019 Free Software Foundation, Inc.
84814e2a
TS
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
36int
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
51int
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}