Date: Sun, 20 Jun 2004 22:11:18 -0700 From: Sean McNeil <sean@mcneil.com> To: freebsd-threads@freebsd.org Subject: kill(pid,0) sends a signal or not? Message-ID: <1087794678.46146.4.camel@server.mcneil.com>
next in thread | raw e-mail | index | archive | help
I'm trying to trace down an issue with kse threads and firefox. There
is an odd "trick" I haven't seen before:
// kill(pid,0) is a neat trick to check if a
// process exists
if (kill(pid, 0) == 0 || errno != ESRCH)
Does this really work? It is kind of odd that it I appear to get a
signal (if the traceback is accurate) with the signal set to 0:
#10 0x0000000202bc7a80 in thr_resume_wrapper (sig=0, siginfo=0x4,
ucp=0x7fffffffd4c0) at /usr/src/lib/libpthread/thread/thr_kern.c:1112
This later causes a sig 11 and the program core dumps.
Any info on how threads are suppose to behave when a process does a
kill(pid,0) would be greatly appreciated.
Cheers,
Sean
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?1087794678.46146.4.camel>