tcp client socket : how to get own port number ??

vlyamtse · 10-01-2010, 02:42 PM

Hi,
I am working with simple tcp client to establish connection to sockaddr_in servAddress and send data segment:
...
connect(sockfd,&servAddr,sizeof(servAddr)) < 0)
send(sockfd, pkt, pktLen, 0);
close(sockfd);
...
Elementary... Here's the tricky part: next i have to handle user level ack the server is sending to "client"... To do that i have to open server socket on the same port number the system assigned to my client socket before. How can i get it ( in user level code)?
Thanks,
-V

kbp · 10-01-2010, 05:26 PM

Code:

connect(sockfd,&servAddr,sizeof(servAddr)) < 0)
send(sockfd, pkt, pktLen, 0);
recv(...);
close(sockfd);

..from memory

theNbomr · 10-01-2010, 07:26 PM

I sounds like you are asking how to do bi-directional communcations on a socket. The answer is too simple: each end of the connection is a read/write file descriptor. Simply leave the socket open until all of the communication has transpired in each direction.

--- rod.