1/* Copyright (C) 1992-2024 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 <fcntl.h>
20#include <fcntl-internal.h>
21#include <sys/socket.h>
22#include <unistd.h>
23
24#include <hurd.h>
25#include <hurd/fd.h>
26#include <hurd/socket.h>
27
28/* Create two new sockets, of type TYPE in domain DOMAIN and using
29 protocol PROTOCOL, which are connected to each other, and put file
30 descriptors for them in FDS[0] and FDS[1]. If PROTOCOL is zero,
31 one will be chosen automatically. Returns 0 on success, -1 for errors. */
32int
33__socketpair (int domain, int type, int protocol, int fds[2])
34{
35 error_t err;
36 socket_t server, sock1, sock2;
37 int d1, d2;
38 int flags = sock_to_o_flags (type & ~SOCK_TYPE_MASK);
39 type &= SOCK_TYPE_MASK;
40
41 if (flags & ~(O_CLOEXEC | O_NONBLOCK))
42 return __hurd_fail (EINVAL);
43
44 if (fds == NULL)
45 return __hurd_fail (EINVAL);
46
47 /* Find the domain's socket server. */
48 server = _hurd_socket_server (domain, 0);
49 if (server == MACH_PORT_NULL)
50 return -1;
51
52 /* Create two sockets and connect them together. */
53
54 err = __socket_create (server, type, protocol, &sock1);
55 if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED
56 || err == MIG_BAD_ID || err == EOPNOTSUPP)
57 {
58 /* On the first use of the socket server during the operation,
59 allow for the old server port dying. */
60 server = _hurd_socket_server (domain, 1);
61 if (server == MACH_PORT_NULL)
62 return -1;
63 err = __socket_create (server, type, protocol, &sock1);
64 }
65 /* TODO: do we need special ERR massaging here, like it is done in
66 __socket? */
67 if (! err)
68 {
69 if (flags & O_NONBLOCK)
70 err = __io_set_some_openmodes (sock1, O_NONBLOCK);
71 /* TODO: do we need special ERR massaging after the previous call? */
72 }
73 if (err)
74 return __hurd_fail (err);
75 if (err = __socket_create (server, type, protocol, &sock2))
76 {
77 __mach_port_deallocate (__mach_task_self (), sock1);
78 return __hurd_fail (err);
79 }
80 if (flags & O_NONBLOCK)
81 err = __io_set_some_openmodes (sock2, O_NONBLOCK);
82 /* TODO: do we need special ERR massaging after the previous call? */
83 if (! err)
84 err = __socket_connect2 (sock1, sock2);
85 if (err)
86 {
87 __mach_port_deallocate (__mach_task_self (), sock1);
88 __mach_port_deallocate (__mach_task_self (), sock2);
89 return __hurd_fail (err);
90 }
91
92 /* Put the sockets into file descriptors. */
93
94 d1 = _hurd_intern_fd (sock1, O_IGNORE_CTTY | flags, 1);
95 if (d1 < 0)
96 {
97 __mach_port_deallocate (__mach_task_self (), sock2);
98 return -1;
99 }
100 d2 = _hurd_intern_fd (sock2, O_IGNORE_CTTY | flags, 1);
101 if (d2 < 0)
102 {
103 err = errno;
104 (void) __close (d1);
105 return __hurd_fail (err);
106 }
107
108 fds[0] = d1;
109 fds[1] = d2;
110 return 0;
111}
112
113weak_alias (__socketpair, socketpair)
114

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