RE: [Lilux-help] Kill stops too much processes

Hi , i will give this week all the ideas i got a try, and i will inform you of the outcoming. Thanks for the help up to now. Hoffmann Marcel _____ From: Brent Frère [mailto:brent@bfrere.net] Sent: dimanche 9 avril 2006 23:04 To: HOFFMANN Marcel Subject: Re: [Lilux-help] Kill stops too much processes The father process receives a signal when one of its sons dies. The default behaviour of a Unix process in this case is 'ignore', but it might be set a different way, and the default behaviour of a signal that is not ignored but unhandeled is 'kill' the process receiving the signal, so the father process. Other sons might not survive this situation, especially if they are not completely independant from the father. As example, if they share pipes, and the last writer or reader dies, they might consider this as an inacceptable condition and stop. I would also check the possible alias for 'kill' to make sure it was not aliased a way or an another. Lets try or use \kill to avoid a possible alias. Maybe the processes showns are actually not different processes, but different threads in the same processus space. Can you confirm ? I know also that there are 'light' forks on modern unices. They actually share the same memory area, and separate the memory pages only in case of writing. This is not far from the thread situation. Maybe it is the case here. I think you should send an another signal than -9 in order to stop this process. -9 is quite hard, as the process has no chance to catch it: it is no more executed at all. An another signal, unhandeled, as -HUP, gives the process the possibility to close a cleaner way. Tell me if it helps. HOFFMANN Marcel a écrit: Hi , to all Lilux Users, We have migrated some of our AIX and Solaris Programs to Linux with some success. We are hitting only smaller "features" like this one where we find no real explanations , even by googling. So the problem is when we kill one process all the processes of the user are killed. But to make it more complicated not all the time , so it is not reproductible. If someone knows a hint to this …. Thanks in advance Hoffmann Marcel ************************** [operator@pportlc1 monitor]$ ps -fu operator UID PID PPID C STIME TTY TIME CMD operator 14975 14974 0 10:26 ? 00:00:00 sh operator 14976 14975 0 10:26 ? 00:00:00 /bin/bash operator 14977 14976 0 10:26 ? 00:00:00 /bin/ksh ./lanceMonitor.ksh operator 14978 14977 0 10:26 ? 00:00:00 /bin/ksh ./processMonitor.ksh /home/operator/echg/monitor/config/processmonitor.properties operator 14979 14978 0 10:26 ? 00:01:51 /home/softs/Java/j2sdk1.4.1_01/jre/bin/java -cp lib/clientutil.jar:lib/mail.jar:lib/log4j-1.2.11.jar:lib/client operator 23738 23737 0 11:50 ? 00:00:00 sh operator 23739 23738 0 11:50 ? 00:00:00 /bin/bash operator 23740 23739 0 11:50 ? 00:00:00 /bin/ksh ./Lance_VerifEchgGedb.ksh operator 23741 23740 0 11:50 ? 00:00:01 /bin/ksh /home/operator/echg/bdl/bin/VerifEchgGedb.ksh operator /home/operator/echg/bdl/bin operator 23745 23741 0 11:50 ? 00:00:00 /bin/ksh /home/operator/echg/bdl/bin/LanceEchgGedb.ksh operator 23747 23745 1 11:50 ? 00:03:27 /home/softs/Java/j2sdk1.4.1_01/jre/bin/java -Dfile.encoding=iso-8859-1 -DHTTPClient.log.mask=-1 -cp /home/bea/w operator 23822 23821 0 11:51 ? 00:00:00 sh operator 23823 23822 0 11:51 ? 00:00:00 /bin/bash operator 23824 23823 0 11:51 ? 00:00:00 /bin/bash operator 23825 23824 0 11:51 ? 00:02:07 /home/softs/Java/j2sdk1.4.1_01/jre/bin/java -Dapiopc.repbase=/home/operator -Dapiopc.replog=/home/log/operator/ operator 24213 24201 0 17:05 pts/1 00:00:00 -bash operator 24617 23741 0 17:09 ? 00:00:00 sleep 30 operator 24620 24213 0 17:09 pts/1 00:00:00 ps -fu operator [operator@pportlc1 monitor]$ kill -9 14978 [operator@pportlc1 monitor]$ ps -fu operator UID PID PPID C STIME TTY TIME CMD operator 24213 24201 0 17:05 pts/1 00:00:00 -bash operator 24661 24213 0 17:09 pts/1 00:00:00 ps -fu operator ******************************** **************************************************************************** ****************************** NOTICE Electronic messages are not secure, error free, and can contain viruses or may be delayed; the sender is not liable for any of these occurences. 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