1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/* Copyright (C) 2001, 2002 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <hurd.h>
#include <hurd/fd.h>
#include <hurd/socket.h>
/* Receive a message as described by MESSAGE from socket FD.
Returns the number of bytes read or -1 for errors. */
ssize_t
__libc_recvmsg (int fd, struct msghdr *message, int flags)
{
error_t err;
addr_port_t aport;
char *data = NULL;
mach_msg_type_number_t len = 0;
mach_port_t *ports;
mach_msg_type_number_t nports;
char *cdata = NULL;
mach_msg_type_number_t clen = 0;
size_t amount;
char *buf;
int i;
/* Find the total number of bytes to be read. */
amount = 0;
for (i = 0; i < message->msg_iovlen; i++)
{
amount += message->msg_iov[i].iov_len;
/* As an optimization, we set the initial values of DATA and LEN
from the first non-empty iovec. This kicks-in in the case
where the whole packet fits into that iovec buffer. */
if (data == NULL && message->msg_iov[i].iov_len > 0)
{
data = message->msg_iov[i].iov_base;
len = message->msg_iov[i].iov_len;
}
}
buf = data;
if (err = HURD_DPORT_USE (fd, __socket_recv (port, &aport,
flags, &data, &len,
&ports, &nports,
&cdata, &clen,
&message->msg_flags, amount)))
return __hurd_dfail (fd, err);
if (message->msg_name != NULL)
{
char *buf = message->msg_name;
mach_msg_type_number_t buflen = message->msg_namelen;
int type;
err = __socket_whatis_address (aport, &type, &buf, &buflen);
if (err == EOPNOTSUPP)
/* If the protocol server can't tell us the address, just return a
zero-length one. */
{
buf = message->msg_name;
buflen = 0;
err = 0;
}
if (err)
{
__mach_port_deallocate (__mach_task_self (), aport);
return __hurd_dfail (fd, err);
}
if (message->msg_namelen > buflen)
message->msg_namelen = buflen;
if (buf != message->msg_name)
{
memcpy (message->msg_name, buf, message->msg_namelen);
__vm_deallocate (__mach_task_self (), (vm_address_t) buf, buflen);
}
if (buflen > 0)
((struct sockaddr *) message->msg_name)->sa_family = type;
}
__mach_port_deallocate (__mach_task_self (), aport);
if (buf == data)
buf += len;
else
{
/* Copy the data into MSG. */
if (len > amount)
message->msg_flags |= MSG_TRUNC;
else
amount = len;
buf = data;
for (i = 0; i < message->msg_iovlen; i++)
{
#define min(a, b) ((a) > (b) ? (b) : (a))
size_t copy = min (message->msg_iov[i].iov_len, amount);
memcpy (message->msg_iov[i].iov_base, buf, copy);
buf += copy;
amount -= copy;
if (len == 0)
break;
}
__vm_deallocate (__mach_task_self (), (vm_address_t) data, len);
}
/* Copy the control message into MSG. */
if (clen > message->msg_controllen)
message->msg_flags |= MSG_CTRUNC;
else
message->msg_controllen = clen;
memcpy (message->msg_control, cdata, message->msg_controllen);
__vm_deallocate (__mach_task_self (), (vm_address_t) cdata, clen);
return (buf - data);
}
weak_alias (__libc_recvmsg, recvmsg)
weak_alias (__libc_recvmsg, __recvmsg)
|
GitWeb