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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>
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* Fetch the host's network interface list. Hurd version.
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Copyright (C) 2002-2023 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 <ifreq.h>
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#include <hurd.h>
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#include <hurd/pfinet.h>
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#include <sys/mman.h>
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void
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__ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
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{
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file_t server;
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server = _hurd_socket_server (PF_INET, 0);
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if (server == MACH_PORT_NULL)
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{
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out:
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*num_ifs = 0;
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*ifreqs = NULL;
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}
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else
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{
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char *data = NULL;
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mach_msg_type_number_t len = 0;
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error_t err = __pfinet_siocgifconf (server, -1, &data, &len);
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if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED)
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{
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/* On the first use of the socket server during the operation,
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allow for the old server port dying. */
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server = _hurd_socket_server (PF_INET, 1);
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if (server == MACH_PORT_NULL)
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goto out;
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err = __pfinet_siocgifconf (server, -1, (data_t *) ifreqs, &len);
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}
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if (err)
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goto out;
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if (len % sizeof (struct ifreq) != 0)
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{
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__munmap (data, len);
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__hurd_fail (EGRATUITOUS);
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goto out;
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}
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*num_ifs = len / sizeof (struct ifreq);
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*ifreqs = (struct ifreq *) data;
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}
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}
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