1/* Copyright (C) 1992-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <errno.h>
19#include <sys/socket.h>
20#include <hurd.h>
21#include <hurd/fd.h>
22#include <hurd/socket.h>
23#include <string.h>
24
25/* Put the current value for socket FD's option OPTNAME at protocol level LEVEL
26 into OPTVAL (which is *OPTLEN bytes long), and set *OPTLEN to the value's
27 actual length. Returns 0 on success, -1 for errors. */
28
29/* XXX should be __getsockopt ? */
30int
31getsockopt (int fd,
32 int level,
33 int optname,
34 void *optval,
35 socklen_t *optlen)
36{
37 error_t err;
38 char *buf = optval;
39 mach_msg_type_number_t buflen = *optlen;
40
41 if (err = HURD_DPORT_USE (fd, __socket_getopt (port,
42 level, optname,
43 &buf, &buflen)))
44 return __hurd_dfail (fd, err);
45
46 if (*optlen > buflen)
47 *optlen = buflen;
48 if (buf != optval)
49 {
50 memcpy (optval, buf, *optlen);
51 __vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
52 }
53
54 return 0;
55}
56

source code of glibc/sysdeps/mach/hurd/getsockopt.c