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9ec31e5727
The __hurd_fail () inline function is the dedicated, idiomatic way of
reporting errors in the Hurd part of glibc. Not only is it more concise
than '{ errno = err; return -1; }', it is since commit
6639cc1002
"hurd: Mark error functions as __COLD" marked with the cold attribute,
telling the compiler that this codepath is unlikely to be executed.
In one case, use __hurd_dfail () over the plain __hurd_fail ().
Signed-off-by: Sergey Bugaev <bugaevc@gmail.com>
Message-Id: <20230520115531.3911877-1-bugaevc@gmail.com>
53 lines
1.8 KiB
C
53 lines
1.8 KiB
C
/* Copyright (C) 1991-2023 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 <hurd.h>
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/* This is initialized in dtable.c when that gets linked in.
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If dtable.c is not linked in, it will be zero. */
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static file_t (*_default_hurd_getdport_fn) (int fd) = 0;
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weak_alias (_default_hurd_getdport_fn, _hurd_getdport_fn)
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file_t
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__getdport (int fd)
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{
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if (_hurd_getdport_fn)
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/* dtable.c has defined the function to fetch a port from the real file
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descriptor table. */
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return (*_hurd_getdport_fn) (fd);
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/* getdport is the only use of file descriptors,
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so we don't bother allocating a real table. */
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if (_hurd_init_dtable == NULL)
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/* Never had a descriptor table. */
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return __hurd_fail (EBADF), MACH_PORT_NULL;
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if (fd < 0 || (unsigned int) fd > _hurd_init_dtablesize
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|| _hurd_init_dtable[fd] == MACH_PORT_NULL)
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return __hurd_fail (EBADF), MACH_PORT_NULL;
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else
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{
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__mach_port_mod_refs (__mach_task_self (), _hurd_init_dtable[fd],
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MACH_PORT_RIGHT_SEND, 1);
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return _hurd_init_dtable[fd];
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}
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}
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weak_alias (__getdport, getdport)
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