ns_sockcallback - Register a socket callback script
ns_sockcallback registers a socket callback script.
The optional argument when can consist of one or more characters of r, w, e, or x, specifying, when the callback should fire. The optional argument timeout can be of the form secs:?microsecs?. When the callback is fired, the script will be called with additional sockid and when. The value of when will be as follows: Value of, when Condition under which the script will be called:
r - the socket is readable
w - the socket is writeable
e - the socket has an exceptional condition
x - the server is shutting down
t - timeout received
set sock [ns_socklisten * 9000] ns_sockcallback $sock newconn r # Keep $sock from closing after connection ends detach $sock # When a connection arrives, newconn will be called as: # newconn $sock r proc newconn {sock when} { set fds [ns_sockaccept $sock] set rfd [lindex $fds 0] set wfd [lindex $fds 1] puts $wfd "Hello!" close $rfd close $wfd }