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/* Copyright (C) 1992-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <fcntl.h>
#include <fcntl-internal.h>
#include <sys/socket.h>
#include <unistd.h>
#include <hurd.h>
#include <hurd/fd.h>
#include <hurd/socket.h>
/* Create two new sockets, of type TYPE in domain DOMAIN and using
protocol PROTOCOL, which are connected to each other, and put file
descriptors for them in FDS[0] and FDS[1]. If PROTOCOL is zero,
one will be chosen automatically. Returns 0 on success, -1 for errors. */
int
__socketpair (int domain, int type, int protocol, int fds[2])
{
error_t err;
socket_t server, sock1, sock2;
int d1, d2;
int flags = sock_to_o_flags (type & ~SOCK_TYPE_MASK);
type &= SOCK_TYPE_MASK;
if (flags & ~(O_CLOEXEC | O_NONBLOCK))
return __hurd_fail (EINVAL);
if (fds == NULL)
return __hurd_fail (EINVAL);
/* Find the domain's socket server. */
server = _hurd_socket_server (domain, 0);
if (server == MACH_PORT_NULL)
return -1;
/* Create two sockets and connect them together. */
err = __socket_create (server, type, protocol, &sock1);
if (err == MACH_SEND_INVALID_DEST || err == MIG_SERVER_DIED
|| err == MIG_BAD_ID || err == EOPNOTSUPP)
{
/* On the first use of the socket server during the operation,
allow for the old server port dying. */
server = _hurd_socket_server (domain, 1);
if (server == MACH_PORT_NULL)
return -1;
err = __socket_create (server, type, protocol, &sock1);
}
/* TODO: do we need special ERR massaging here, like it is done in
__socket? */
if (! err)
{
if (flags & O_NONBLOCK)
err = __io_set_some_openmodes (sock1, O_NONBLOCK);
/* TODO: do we need special ERR massaging after the previous call? */
}
if (err)
return __hurd_fail (err);
if (err = __socket_create (server, type, protocol, &sock2))
{
__mach_port_deallocate (__mach_task_self (), sock1);
return __hurd_fail (err);
}
if (flags & O_NONBLOCK)
err = __io_set_some_openmodes (sock2, O_NONBLOCK);
/* TODO: do we need special ERR massaging after the previous call? */
if (! err)
err = __socket_connect2 (sock1, sock2);
if (err)
{
__mach_port_deallocate (__mach_task_self (), sock1);
__mach_port_deallocate (__mach_task_self (), sock2);
return __hurd_fail (err);
}
/* Put the sockets into file descriptors. */
d1 = _hurd_intern_fd (sock1, O_IGNORE_CTTY | flags, 1);
if (d1 < 0)
{
__mach_port_deallocate (__mach_task_self (), sock2);
return -1;
}
d2 = _hurd_intern_fd (sock2, O_IGNORE_CTTY | flags, 1);
if (d2 < 0)
{
err = errno;
(void) __close (d1);
return __hurd_fail (err);
}
fds[0] = d1;
fds[1] = d2;
return 0;
}
weak_alias (__socketpair, socketpair)
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