Re^2: open (to read) and kill a pipe to a pipe

Thanks Your Mother!

kill 9, -$pid;   # didn't work

# But...
kill -9, $pid    # WORKS !!!
[download]

From perldoc on kill:
if SIGNAL is negative, it kills process groups instead of processes. That means you usually want to use positive not negative signals.

Comment on Re^2: open (to read) and kill a pipe to a pipe Download Code

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Re^3: open (to read) and kill a pipe to a pipe by ikegami (Patriarch) on Aug 26, 2010 at 22:51 UTC
That's interesting since Windows doesn't have process groups. I wonder what it actually does ( when asked to kill a process group ).	[reply]
Re^4: open (to read) and kill a pipe to a pipe by BrowserUk (Patriarch) on Aug 27, 2010 at 18:27 UTC
See `kill_process_tree_toolhelp()` in win32.c	[reply] [d/l]
Re^4: open (to read) and kill a pipe to a pipe by rowdog (Curate) on Aug 27, 2010 at 15:34 UTC
Corion recently told me that "under the Windows fork emulation, emulated forked children get negative PIDs". I don't know where this is documented but I believe him.	[reply]
Re^5: open (to read) and kill a pipe to a pipe by ikegami (Patriarch) on Aug 27, 2010 at 16:46 UTC
That's true, but I don't see how it's relevant. He's passing a negative signal.	[reply]
Re^6: open (to read) and kill a pipe to a pipe by rowdog (Curate) on Aug 27, 2010 at 17:14 UTC
Re^7: open (to read) and kill a pipe to a pipe by ikegami (Patriarch) on Aug 27, 2010 at 21:57 UTC