Proper way to close a socket

[Lorenzo Thurman]

I'm playing around with socket programming and have found a few
tutorials in the 'net, but I have a question that they don't seem to answer:
What's the proper way to close a connection? I use close(fd), but if I
try to restart the server app, I get the error that the socket is in
use. netstat confirms the port is in TIME_WAIT and it eventually becomes
available again, but most server apps (apache, mysql, etc) can be
restarted without such a delay. How do I accomplish this?
TIA

[Jerry McBride]

Post by Lorenzo Thurman
I'm playing around with socket programming and have found a few
What's the proper way to close a connection? I use close(fd), but if I
try to restart the server app, I get the error that the socket is in
use. netstat confirms the port is in TIME_WAIT and it eventually becomes
available again, but most server apps (apache, mysql, etc) can be
restarted without such a delay. How do I accomplish this?

What language???


Under python, you can close and reuse the same socket almost immediately...


#!/usr/bin/python

try:
import socket
except ImportError:
print "Error imorting socket"
pass

# create an InterNET, STREAMing socket (aka TCP/IP)
serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# allow quick restart and reuse of server socket
serversocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

[Lorenzo Thurman]

Post by Jerry McBride

Post by Lorenzo Thurman
I'm playing around with socket programming and have found a few
What's the proper way to close a connection? I use close(fd), but if I
try to restart the server app, I get the error that the socket is in
use. netstat confirms the port is in TIME_WAIT and it eventually becomes
available again, but most server apps (apache, mysql, etc) can be
restarted without such a delay. How do I accomplish this?

What language???
Under python, you can close and reuse the same socket almost immediately...
#!/usr/bin/python
import socket
print "Error imorting socket"
pass
# create an InterNET, STREAMing socket (aka TCP/IP)
serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# allow quick restart and reuse of server socket
serversocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

Sorry I wasn't clear, in C.

[Lorenzo Thurman]

Post by Lorenzo Thurman
I'm playing around with socket programming and have found a few
What's the proper way to close a connection? I use close(fd), but if I
try to restart the server app, I get the error that the socket is in
use. netstat confirms the port is in TIME_WAIT and it eventually becomes
available again, but most server apps (apache, mysql, etc) can be
restarted without such a delay. How do I accomplish this?
TIA

Ah, it looks like:
int shutdown(fd, how) is the way to go.