Non I/O Blocking exec replacement ?

[GodOfSuicide]

Is there some module out there that replaces the exec cmd with a non blocking one ? (no, i dont mean bgexec or open) ?

like for example
set outfile [myexec "ping $host" ping_get]
and each time this exec sends a new line -> it gets sent to ping_get

maybe one of the coders in here can realize this idea..my own C / C++ skills are too low for this

[user]

why not open |?

[GodOfSuicide]

why not open |?

is it possible to use open the way i just told ? (seriouse question, i really dont know)

[user]

is it possible to use open the way i just told ?

Yes. By using 'fconfigure' to make it non-blocking and 'fileevent readable' to set up the callback. The only thing that is a bit tricky is redirection of stderr...i'll get back to you on this...try this code:

Code: Select all

proc myexec {cmd callback} {
	set f [open |$cmd r+]
	fconfigure $f -blocking 0
	fileevent $f readable [list myexecIn $f $callback]
	set f
}
proc myexecIn {f callback} {
	if {[set i [gets $f line]]>0} {
		uplevel #0 [concat $callback [list $line]]
	} elseif {$i==-1} {
		close $f
		uplevel #0 [concat $callback {{}}]
	}
}

The callback command will be called for each line of output. Blank lines are ignored and when the process ends the callback command is called with a blank argument - like a dcc connection put under control under eggdrop. (the callback can be a list of command+arguments just like the built in callbacks.) This code is by no means final, but it's something to start with