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Full Discussion: non blocking connect
Top Forums Programming non blocking connect Post 302450938 by satish@123 on Sunday 5th of September 2010 02:15:27 PM
Old 09-05-2010
non blocking connect

OS : solaris 10 X86

I created stream socket, tries to connect to port 7 on the remote machine.
After doing the non blocking connect call I did select with time out value is 3 secs. I am always getting timed out though I am writing prior to select.

code:

Code:
x=fcntl(S,F_GETFL,0);
fcntl(s,F_SETFL,x | O_NONBLOCK);
rc=connect(s, (struct sockaddr *)&sin, sizeof(sin));
if( rc == 0)
  write(s,"service",7);
else
{
   if( errno == EINPROGRESS)
   {
        write(s,"service",7);
     FD_ZERO(&writeFDs);
     FD_SET(s, &writeFDs);
     rc=select(maxFDs, &writeFDs, (fd_set *) NULL, (fd_set *)NULL, 
                                                                (struct timeval *)(&timeout));
     if( rc ==0 || rc == -1)
       printf(" Timed out -- Not connected even after 3 secs wait");
    else
      printf(" connected and written");
}

My doubt is write on non blocking socket will happen or write fails and select will timeout. What do I have to do to connection successful

Moderator's Comments:
Mod Comment After more than 40 posts you should know how and when to apply code tags


---------- Post updated 09-05-10 at 01:11 PM ---------- Previous update was 09-04-10 at 11:56 PM ----------

I found wrong in my code. I should move my write to the else part and I should set read flags as NULL and write flags as my socket.

---------- Post updated at 01:15 PM ---------- Previous update was at 01:11 PM ----------

my code should be

Code:
if( errno == EINPROGRESS)
{        
     FD_ZERO(&writeFDs);
     FD_SET(s, &writeFDs);
     rc=select(maxFDs, (fd_set *) NULL, &writeFDs,  (fd_set *)NULL, 
                                                                (struct timeval *)(&timeout));
     if( rc ==0 || rc == -1)
       printf(" Timed out -- Not connected even after 3 secs wait");
    else
       write(s,"service",7);


Last edited by pludi; 09-05-2010 at 06:51 AM..
 

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SOCKET_SET_BLOCK(3)							 1						       SOCKET_SET_BLOCK(3)

socket_set_block - Sets blocking mode on a socket resource

SYNOPSIS
bool socket_set_block (resource $socket) DESCRIPTION
The socket_set_block(3) function removes the O_NONBLOCK flag on the socket specified by the $socket parameter. When an operation (e.g. receive, send, connect, accept, ...) is performed on a blocking socket, the script will pause its execution until it receives a signal or it can perform the operation. PARAMETERS
o $socket - A valid socket resource created with socket_create(3) or socket_accept(3). RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 socket_set_block(3) example <?php $socket = socket_create_listen(1223); socket_set_block($socket); socket_accept($socket); ?> This example creates a listening socket on all interfaces on port 1223 and sets the socket to O_BLOCK mode. socket_accept(3) will hang until there is a connection to accept. SEE ALSO
socket_set_nonblock(3), socket_set_option(3). PHP Documentation Group SOCKET_SET_BLOCK(3)
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