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63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
/* Helper functions for translating between O_* and SOCK_* flags.
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Copyright (C) 2008-2019 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <fcntl.h>
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#include <sys/socket.h>
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/* Do some compile-time checks for the SOCK_* constants, which we rely on. */
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_Static_assert (SOCK_CLOEXEC == O_CLOEXEC,
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"SOCK_CLOEXEC is assumed to be the same as O_CLOEXEC");
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_Static_assert (((SOCK_MAX - 1) | SOCK_TYPE_MASK) == SOCK_TYPE_MASK,
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"SOCK_TYPE_MASK must contain SOCK_MAX - 1");
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_Static_assert ((SOCK_CLOEXEC & SOCK_TYPE_MASK) == 0,
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"SOCK_TYPE_MASK must not contain SOCK_CLOEXEC");
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_Static_assert ((SOCK_NONBLOCK & SOCK_TYPE_MASK) == 0,
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"SOCK_TYPE_MASK must not contain SOCK_NONBLOCK");
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/* Convert from SOCK_* flags to O_* flags. */
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__extern_always_inline
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int
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sock_to_o_flags (int in)
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{
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int out = 0;
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if (in & SOCK_NONBLOCK)
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out |= O_NONBLOCK;
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/* Others are passed through unfiltered. */
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out |= in & ~(SOCK_NONBLOCK);
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return out;
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}
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/* Convert from O_* flags to SOCK_* flags. */
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__extern_always_inline
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int
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o_to_sock_flags (int in)
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{
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int out = 0;
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if (in & O_NONBLOCK)
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out |= SOCK_NONBLOCK;
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/* Others are passed through unfiltered. */
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out |= in & ~(O_NONBLOCK);
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return out;
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}
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