1/* Copyright (C) 1994-2022 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 <sys/un.h>
21#include <hurd.h>
22#include <hurd/fd.h>
23#include <hurd/ifsock.h>
24#include <hurd/socket.h>
25#include <sysdep-cancel.h>
26#include "hurd/hurdsocket.h"
27
28/* Send N bytes of BUF on socket FD to peer at address ADDR (which is
29 ADDR_LEN bytes long). Returns the number sent, or -1 for errors. */
30ssize_t
31__sendto (int fd,
32 const void *buf,
33 size_t n,
34 int flags,
35 const struct sockaddr_un *addr,
36 socklen_t addr_len)
37{
38 addr_port_t aport = MACH_PORT_NULL;
39 error_t err;
40 size_t wrote;
41
42 /* Get an address port for the desired destination address. */
43 error_t create_address_port (io_t port,
44 const struct sockaddr_un *addr,
45 socklen_t addr_len,
46 addr_port_t *aport)
47 {
48 error_t err_port;
49
50 if (addr->sun_family == AF_LOCAL)
51 {
52 char *name = _hurd_sun_path_dupa (addr, addr_len);
53 /* For the local domain, we must look up the name as a file and talk
54 to it with the ifsock protocol. */
55 file_t file = __file_name_lookup (name, 0, 0);
56 if (file == MACH_PORT_NULL)
57 return errno;
58 err_port = __ifsock_getsockaddr (file, aport);
59 __mach_port_deallocate (__mach_task_self (), file);
60 if (err_port == MIG_BAD_ID || err_port == EOPNOTSUPP)
61 /* The file did not grok the ifsock protocol. */
62 err_port = ENOTSOCK;
63 }
64 else
65 {
66 err_port = __socket_create_address (port,
67 addr->sun_family,
68 (char *) addr,
69 addr_len,
70 aport);
71 }
72
73 return err_port;
74 }
75
76 err = HURD_DPORT_USE_CANCEL (fd,
77 ({
78 if (addr != NULL)
79 err = create_address_port (port, addr, addr_len,
80 &aport);
81 else
82 err = 0;
83 if (! err)
84 {
85 /* Send the data. */
86 int cancel_oldtype = LIBC_CANCEL_ASYNC();
87 err = __socket_send (port, aport,
88 flags, buf, n,
89 NULL,
90 MACH_MSG_TYPE_COPY_SEND, 0,
91 NULL, 0, &wrote);
92 LIBC_CANCEL_RESET (cancel_oldtype);
93 }
94 err;
95 }));
96
97 if (aport != MACH_PORT_NULL)
98 __mach_port_deallocate (__mach_task_self (), aport);
99
100 return err ? __hurd_sockfail (fd, flags, err) : wrote;
101}
102
103weak_alias (__sendto, sendto)
104

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