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Hurd: sendto: do not crash when ADDR is null
[thirdparty/glibc.git] / sysdeps / mach / hurd / sendto.c
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b62b62ac 1/* Copyright (C) 1994,95,96,97,99,2001,02 Free Software Foundation, Inc.
478b92f0 2 This file is part of the GNU C Library.
28f540f4 3
478b92f0 4 The GNU C Library is free software; you can redistribute it and/or
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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.
28f540f4 8
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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
41bdb6e2 12 Lesser General Public License for more details.
28f540f4 13
41bdb6e2 14 You should have received a copy of the GNU Lesser General Public
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15 License along with the GNU C Library; if not, see
16 <http://www.gnu.org/licenses/>. */
28f540f4 17
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18#include <errno.h>
19#include <sys/socket.h>
0fd43249 20#include <sys/un.h>
28f540f4 21#include <hurd.h>
28f540f4 22#include <hurd/fd.h>
ad738d03 23#include <hurd/ifsock.h>
0fd43249 24#include <hurd/socket.h>
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25
26/* Send N bytes of BUF on socket FD to peer at address ADDR (which is
27 ADDR_LEN bytes long). Returns the number sent, or -1 for errors. */
c2063191 28ssize_t
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29__sendto (int fd,
30 const void *buf,
31 size_t n,
32 int flags,
33 const struct sockaddr_un *addr,
34 socklen_t addr_len)
28f540f4 35{
ac4ea442 36 addr_port_t aport = MACH_PORT_NULL;
28f540f4 37 error_t err;
b62b62ac 38 size_t wrote;
be7e3b7e 39
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40 /* Get an address port for the desired destination address. */
41 error_t create_address_port (io_t port,
42 const struct sockaddr_un *addr,
43 socklen_t addr_len,
44 addr_port_t *aport)
ad738d03 45 {
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46 error_t err_port;
47
48 if (addr->sun_family == AF_LOCAL)
49 {
50 /* For the local domain, we must look up the name as a file and talk
51 to it with the ifsock protocol. */
52 file_t file = __file_name_lookup (addr->sun_path, 0, 0);
53 if (file == MACH_PORT_NULL)
54 return errno;
55 err_port = __ifsock_getsockaddr (file, aport);
56 __mach_port_deallocate (__mach_task_self (), file);
57 if (err_port == MIG_BAD_ID || err_port == EOPNOTSUPP)
58 /* The file did not grok the ifsock protocol. */
59 err_port = ENOTSOCK;
60 }
61 else
62 {
63 err_port = __socket_create_address (port,
64 addr->sun_family,
65 (char *) addr,
66 addr_len,
67 aport);
68 }
69
70 return err_port;
ad738d03 71 }
28f540f4 72
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73 err = HURD_DPORT_USE (fd,
74 ({
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75 if (addr != NULL)
76 err = create_address_port (port, addr, addr_len,
77 &aport);
78 else
79 err = 0;
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80 if (! err)
81 {
82 /* Send the data. */
83 err = __socket_send (port, aport,
84 flags, buf, n,
85 NULL,
86 MACH_MSG_TYPE_COPY_SEND, 0,
87 NULL, 0, &wrote);
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88 }
89 err;
90 }));
91
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92 if (aport != MACH_PORT_NULL)
93 __mach_port_deallocate (__mach_task_self (), aport);
94
0a583b54 95 return err ? __hurd_sockfail (fd, flags, err) : wrote;
28f540f4 96}
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97
98weak_alias (__sendto, sendto)