Herman.Schultz@gmail.com wrote:
> I have the following code which listens on a server socket and accept
> client connections. How can I change it to just accept client
> connection for just 10 seconds after the server port is opened? I
> read about select, but the example I found are for select on multiple
> sockets, not just 1.

> serverAddress.sin_family = AF_INET;
> serverAddress.sin_addr.s_addr = htonl(INADDR_ANY);
> serverAddress.sin_port = htons(listenPort);

> if (bind(listenSocket,
> (struct sockaddr *) &serverAddress,
> sizeof(serverAddress)) < 0) {
> std::cout << "cannot bind socket";
> return;
> }

> listen(listenSocket, 10);

> while (1) {
> std::cout << "Waiting for TCP connection on port " << listenPort
> << " ...\n";

> clientAddressLength = sizeof(clientAddress);
> connectSocket = accept(listenSocket,
> (struct sockaddr *) &clientAddress,
> &clientAddressLength);
> }


You can use select to wait on as many sockets (or file descriptors)
as you want, if you want to wait for a single one just remove all
but the one you're interested in from the example. Since you don't
post the example code I can't show you directly how it's to be done
there but basically it's just

fd_set read_set;
struct timeval timeout;

FD_ZERO( &read_set ); /* clear the FD set */
FD_SET( listenSocket, &read_set ); /* add the socket to the set */

timeout.tv_sec = 10; /* set timeout to 10 s */
timeout.tv_usec = 0;

switch ( select( listenSocket + 1, &read_set, NULL, NULL, &timeout ) )
{
case 0:
fprintf( stderr, "timeout occurred\n" );
break;

case 1 :
/* just to make 100% sure;-) */
assert( FD_ISSET( listenSocket ), &read_set ) );

connectSocket = accept( listenSocket,
( struct sockaddr * ) &clientAddress,
&clientAddressLength );
...
break;

default:
fprintf( stderr, "some error during select\n" );
break;
}

Alternatively, you could create a timer that expires after 10 se-
conds, raising a SIGALRM signal. In that case accept() will return
with a value of -1 and errno is set to EINTR. Of course, you must
remove the timer if a connection comes in before the timer times
out.
Regards, Jens
--
\ Jens Thoms Toerring ___ jt@toerring.de
\__________________________ http://toerring.de

On Jul 5, 11:21 am, j...@toerring.de (Jens Thoms Toerring) wrote:
> Herman.Schu...@gmail.com wrote:
> > I have the following code which listens on a server socket and accept
> > client connections. How can I change it to just accept client
> > connection for just 10 seconds after the server port is opened? I
> > read about select, but the example I found are for select on multiple
> > sockets, not just 1.
> > serverAddress.sin_family = AF_INET;
> > serverAddress.sin_addr.s_addr = htonl(INADDR_ANY);
> > serverAddress.sin_port = htons(listenPort);
> > if (bind(listenSocket,
> > (struct sockaddr *) &serverAddress,
> > sizeof(serverAddress)) < 0) {
> > std::cout << "cannot bind socket";
> > return;
> > }
> > listen(listenSocket, 10);
> > while (1) {
> > std::cout << "Waiting for TCP connection on port " << listenPort
> > << " ...\n";
> > clientAddressLength = sizeof(clientAddress);
> > connectSocket = accept(listenSocket,
> > (struct sockaddr *) &clientAddress,
> > &clientAddressLength);
> > }
>
> You can use select to wait on as many sockets (or file descriptors)
> as you want, if you want to wait for a single one just remove all
> but the one you're interested in from the example. Since you don't
> post the example code I can't show you directly how it's to be done
> there but basically it's just
>
> fd_set read_set;
> struct timeval timeout;
>
> FD_ZERO( &read_set ); /* clear the FD set */
> FD_SET( listenSocket, &read_set ); /* add the socket to the set */
>
> timeout.tv_sec = 10; /* set timeout to 10 s */
> timeout.tv_usec = 0;
>
> switch ( select( listenSocket + 1, &read_set, NULL, NULL, &timeout ) )
> {
> case 0:
> fprintf( stderr, "timeout occurred\n" );
> break;
>
> case 1 :
> /* just to make 100% sure;-) */
> assert( FD_ISSET( listenSocket ), &read_set ) );
>
> connectSocket = accept( listenSocket,
> ( struct sockaddr * ) &clientAddress,
> &clientAddressLength );
> ...
> break;
>
> default:
> fprintf( stderr, "some error during select\n" );
> break;
> }
>
> Alternatively, you could create a timer that expires after 10 se-
> conds, raising a SIGALRM signal. In that case accept() will return
> with a value of -1 and errno is set to EINTR. Of course, you must
> remove the timer if a connection comes in before the timer times
> out.
> Regards, Jens
> --
> \ Jens Thoms Toerring ___ j...@toerring.de
> \__________________________ http://toerring.de

Thank you very much for your help. How can I get 'assert' call to
comile?

I get this compilation error:

error: 'assert' was not declared in this scope
Server.tproj/RTSPRequestInterface.cpp:506: error: expected `;' before
')' token

Herman.Schultz@gmail.com wrote:
> How can I get 'assert' call to comile?

> I get this compilation error:

> error: 'assert' was not declared in this scope
> Server.tproj/RTSPRequestInterface.cpp:506: error: expected `;' before
> ')' token

You need to include (in C) or (for C++). But
you can also leave it out - if select() returns and you were wai-
ting for a single file selector then there hardly should be a way
that it would return for a different file descriptor then the one
you were waiting for.
Regards, Jens
--
\ Jens Thoms Toerring ___ jt@toerring.de
\__________________________ http://toerring.de

On Jul 5, 11:48 am, j...@toerring.de (Jens Thoms Toerring) wrote:
> Herman.Schu...@gmail.com wrote:
> > How can I get 'assert' call to comile?
> > I get this compilation error:
> > error: 'assert' was not declared in this scope
> > Server.tproj/RTSPRequestInterface.cpp:506: error: expected `;' before
> > ')' token
>
> You need to include (in C) or (for C++). But
> you can also leave it out - if select() returns and you were wai-
> ting for a single file selector then there hardly should be a way
> that it would return for a different file descriptor then the one
> you were waiting for.
> Regards, Jens
> --
> \ Jens Thoms Toerring ___ j...@toerring.de
> \__________________________ http://toerring.de

Thanks. I have another compiler error:

error: 'FD_ISSET' was not declared in this scope

>From here:
http://scitsc.wlv.ac.uk/cgi-bin/mansec?3C+FD_ISSET

I have add
#include
#include

to my .cpp file, and yet, it still said FD_ISSET was not declared in
the script.

Thank you for any pointers.

Herman.Schultz@gmail.com wrote:
> Thanks. I have another compiler error:

> error: 'FD_ISSET' was not declared in this scope

> >From here:
> http://scitsc.wlv.ac.uk/cgi-bin/mansec?3C+FD_ISSET

> I have add
> #include
> #include

> to my .cpp file, and yet, it still said FD_ISSET was not declared in
> the script.

To be sure you got everthing I would recommend to also include

#include
#include

- at least that's what the Linux man page for select(2) says.

Regards, Jens
--
\ Jens Thoms Toerring ___ jt@toerring.de
\__________________________ http://toerring.de

In article <1183659265.521843.223190@n2g2000hse.googlegroups.c om>,
wrote:

>Thanks. I have another compiler error:
>
> error: 'FD_ISSET' was not declared in this scope

man socket

--
http://www.spinics.net/lists/

In article <5f4rhjF3beeihU1@mid.uni-berlin.de>,
Jens Thoms Toerring wrote:

>#include
>#include
>
>- at least that's what the Linux man page for select(2) says.

Mine says:

#include
#include

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