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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
// IPC_SAP/poll server, which illustrates how to integrate the ACE
// socket wrappers with the SVR4 <poll> system call to create a
// single-threaded concurrent server. This server program can be
// driven by the oneway test mode of CPP-inclient.cpp.
#include "ace/OS_main.h"
#include "ace/SOCK_Acceptor.h"
#include "ace/SOCK_Stream.h"
#include "ace/INET_Addr.h"
#include "ace/Log_Msg.h"
#include "ace/OS_NS_poll.h"
#include "ace/OS_NS_stdio.h"
#if defined (ACE_HAS_POLL)
// Should we be verbose?
static int verbose = 0;
// Max number of open handles.
static const int MAX_HANDLES = 200;
struct Buffer_Info
{
void *buf_;
// Pointer to the buffer.
size_t len_;
// Length of the buffer.
};
// Array of <pollfd>'s.
static struct pollfd poll_array[MAX_HANDLES];
// Array of <Buffer_Info>.
static Buffer_Info buffer_array[MAX_HANDLES];
static void
init_poll_array (void)
{
int i;
for (i = 0; i < MAX_HANDLES; i++)
{
poll_array[i].fd = ACE_INVALID_HANDLE;
poll_array[i].events = POLLIN;
}
}
static int
init_buffer (size_t index)
{
ACE_INT32 len;
if (ACE::recv_n (poll_array[index].fd,
(void *) &len,
sizeof (ACE_INT32)) != sizeof (ACE_INT32))
ACE_ERROR_RETURN ((LM_ERROR,
"(%P|%t) %p\n",
"recv_n failed"),
-1);
else
{
len = ntohl (len);
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) reading messages of size %d from handle %d\n",
len,
poll_array[index].fd));
ACE_ALLOCATOR_RETURN (buffer_array[index].buf_,
ACE_OS::malloc (len),
-1);
buffer_array[index].len_ = len;
}
return 0;
}
static void
handle_data (size_t &n_handles)
{
// Handle pending logging messages first (s_handle + 1 is guaranteed
// to be lowest client descriptor).
for (size_t index = 1; index < n_handles; index++)
{
if (ACE_BIT_ENABLED (poll_array[index].revents, POLLIN))
{
// First time in, we need to initialize the buffer.
if (buffer_array[index].buf_ == 0
&& init_buffer (index) == -1)
{
ACE_ERROR ((LM_ERROR,
"(%P|%t) %p\n",
"init_buffer"));
continue;
}
// Read data from client (terminate on error).
ssize_t n = ACE::recv (poll_array[index].fd,
buffer_array[index].buf_,
buffer_array[index].len_);
// <recv> will not block in this case!
if (n == -1)
ACE_ERROR ((LM_ERROR,
"%p\n",
"read failed"));
else if (n == 0)
{
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) closing oneway server at handle %d\n",
poll_array[index].fd));
// Handle client connection shutdown.
ACE_OS::close (poll_array[index].fd);
poll_array[index].fd = poll_array[--n_handles].fd;
ACE_OS::free ((void *) buffer_array[index].buf_);
buffer_array[index].buf_ = 0;
buffer_array[index].len_ = 0;
}
else if (verbose)
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) %*s",
n,
buffer_array[index].buf_));
}
}
}
static void
handle_connections (ACE_SOCK_Acceptor &peer_acceptor,
size_t &n_handles)
{
if (ACE_BIT_ENABLED (poll_array[0].revents, POLLIN))
{
ACE_SOCK_Stream new_stream;
ACE_INET_Addr client;
ACE_Time_Value nonblock (0, 0);
// Handle all pending connection requests (note use of "polling"
// feature that doesn't block).
while (ACE_OS::poll (poll_array, 1, nonblock) > 0)
if (peer_acceptor.accept (new_stream, &client) == -1)
ACE_OS::perror ("accept");
else
{
const char *s = client.get_host_name ();
ACE_ASSERT (s != 0);
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) client %s\n",
s));
poll_array[n_handles++].fd = new_stream.get_handle ();
}
}
}
int
ACE_TMAIN (int, ACE_TCHAR *[])
{
u_short port = ACE_DEFAULT_SERVER_PORT + 1;
// Create a server end-point.
ACE_INET_Addr addr (port);
ACE_SOCK_Acceptor peer_acceptor (addr);
ACE_HANDLE s_handle = peer_acceptor.get_handle ();
init_poll_array ();
poll_array[0].fd = s_handle;
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) starting oneway server at port %d\n",
port));
for (size_t n_handles = 1;;)
{
// Wait for client I/O events (handle interrupts).
while (ACE_OS::poll (poll_array, n_handles) == -1
&& errno == EINTR)
continue;
handle_data (n_handles);
handle_connections (peer_acceptor, n_handles);
}
/* NOTREACHED */
return 0;
}
#else
#include <stdio.h>
int ACE_TMAIN (int, ACE_TCHAR *[])
{
ACE_OS::fprintf (stderr, "This feature is not supported\n");
return 0;
}
#endif /* ACE_HAS_POLL */
|
