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// $Id$
// 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"
ACE_RCSID(SOCK_SAP, CPP_inserver_poll, "$Id$")
#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;;)
{
ACE_ENDLESS_LOOP
// 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 */
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