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Full Discussion: Killing idle user processes
Top Forums UNIX for Dummies Questions & Answers Killing idle user processes Post 19588 by mikek147 on Saturday 13th of April 2002 05:42:23 PM
Old 04-13-2002
Uning the kill command with the signal of 9 is a dangerous way of terminating a process. The 9 signal is an absolute and unblockable form of termination. This means that if a process has, for example, multiple files open or has a database open, although the user may be gone, the files can remain open or the database left in an unstable condition.

If you must kill a process, use kill with signal 15 or without a signal. Using kill without a signal, it defaults to signal 15 anyway, which notifies the offending process to shut down. If the process is written correctly, it will close down transactions or any open files and exit cleanly. -mk
 

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LEARN ABOUT V7

kill

KILL(2) 							System Calls Manual							   KILL(2)

NAME

       kill  -	send signal to a process

SYNOPSIS

       kill(pid, sig);

DESCRIPTION

       Kill sends the signal sig to the process specified by the process number in r0.	See signal(2) for a list of signals.

       The sending and receiving processes must have the same effective user ID, otherwise this call is restricted to the super-user.

       If the process number is 0, the signal is sent to all other processes in the sender's process group; see tty(4).

       If the process number is -1, and the user is the super-user, the signal is broadcast universally except to processes 0 and 1, the scheduler
       and initialization processes, see init(8).

       Processes may send signals to themselves.

SEE ALSO

       signal(2), kill(1)

DIAGNOSTICS

       Zero is returned if the process is killed; -1 is returned if the process does not have the same effective user  ID  and	the  user  is  not
       super-user, or if the process does not exist.

ASSEMBLER

       (kill = 37.)
       (process number in r0)
       sys kill; sig

																	   KILL(2)
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