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Full Discussion: SIGCHLD trace problem
Top Forums Programming SIGCHLD trace problem Post 302239188 by aaronwong on Tuesday 23rd of September 2008 04:51:49 AM
Old 09-23-2008
Thanks for your reasonable advice ...

I probably did not state clearly about the case ... well, for the example ABCD case, it's simple because there are only two processes that could kill the child B.
What I really want to know is that, if it is illegal for any process except C to kill process B, A have to check that who kills B when receives SIGCHLD from B (what if we kill B manually by "kill -9" command ? perhaps A can distinguish them by pid of the killer ?).
 

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KILL(1) 						      General Commands Manual							   KILL(1)

NAME
kill, broke - print commands to kill processes SYNOPSIS
kill name broke DESCRIPTION
Kill prints commands that will cause all processes called name and owned by the current user to be terminated. Use the send command of 81/2(1), or pipe the output of kill into rc(1) to execute the commands. Kill suggests sending a kill note to the process; the same message delivered to the process's ctl file (see proc(3)) is a surer, if heavy handed, kill, but is necessary if the offending process is ignoring notes. Broke prints commands that will cause all processes in the Broken state and owned by the current user to go away. When a process dies because of an error caught by the system, it may linger in the Broken state to allow examination with a debugger. Executing the commands printed by broke lets the system reclaim the resources used by the broken processes. SOURCE
/rc/bin/kill /rc/bin/broke SEE ALSO
ps(1), stop(1), proc(3) KILL(1)
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