Fix: Exit Codes

[Meldiron]

• Can run both in parallel, and in serial.

Manual QA:

All working:

All failing:

40% failing:

[christyjacob4]

Some minor comments.

Can you also explain / share a link to the exact logic here ?

[Meldiron]

Some minor comments.

Can you also explain / share a link to the exact logic here ?

'( ' . $cmd . ' ) 3>/dev/null ; echo $? >&3'

($cmd) executes a command
3 means we are creating a new pipe (stdin, stderr, stdout, OUR NEW ONE)
> forwards output of the command
/dev/null means we don't display output
; indicates a new command
echo $? prints the exit code of the last command
> again, forwards output of the command
&3 makes sure to print output to 3rd pipe

Finally, we get output of 3rd pipe in PHP \stream_set_blocking($pipes[3], false);.

That's how I remember understanding it. The website was a really old forum, can't find it anymore.