How to free a socket????

raga4223688 · 03-25-2007, 01:04 PM

I recently ran a program...but abruptly stopped it using Cntrl + Z....Now the sockets i used in it (Internet domain sockets) were not free....When i again tried to run the same program it gave me error "Cant bind sockets".....I used netstat to check whether the socket is there...it was there with state CLOSED_WAIT...Now is there any command or way to clean/free/remove these unwanted sockets!!!!!!!!!!!

Unknown_User · 03-25-2007, 03:54 PM

Use the close() command.

http://linux.about.com/library/cmd/blcmdl2_close.htm

http://www.rt.com/man/socket.4.html

Mara · 03-27-2007, 03:32 PM

Remember that you need to wait a while after closing a listening socket to bind to the same port number.

raga4223688 · 03-28-2007, 11:24 AM

Can u tell me wat signal is generated when u kill a program using Cntrl+Z ...is it SIGINT or SIGKILL??? So can the solution be to capture these signals and close the desired socket???

sayarsoft · 03-29-2007, 03:01 AM

When you strace your program you will see that you get SIGTSTP when you pres C+Z.

As a solution to your problem :

setsockopt with SO_REUSEADDR your socket descriptor before bind. So you can bind at the next run.