ns_sockcallback

Overview

Register a socket callback script

Syntax

ns_sockcallback sockid script when

Description

ns_sockcallback registers a socket callback script. The script should accept the arguments sockid and when. The script will be called according to the value of the when argument 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

Example

    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
    }

See Also

Ns_SockCallback

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