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Full Discussion: Kill all process by UID
Top Forums UNIX for Advanced & Expert Users Kill all process by UID Post 302560920 by DendyGamer on Sunday 2nd of October 2011 11:53:39 AM
Old 10-02-2011
Quote:
Originally Posted by MacMonster
"killall" command has an option to kill by username. For example:

Code:
 killall -9 -u mysql

However, you need to do some extra works to convert the UID to username.
Yes, but i do not know is it safe. I mean killall gets process list from kernel. While getting process list from kernel process_we_want_to_kill can call fork and some processes may be stay alive (will not be killed, because new process will be created after/during getting process list in kill). I have not read source code of killall (and there are no killall in OpenBSD), but is it safe ? Will it kill really all processes without any "bugs", or there are any "features" with killing new processes which starts during killing process?
 

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killall(8)						      System Manager's Manual							killall(8)

NAME
killall - Terminates all processes started by the user, except the calling process SYNOPSIS
/usr/sbin/killall [- | [-]signal_name | -signal_number] /usr/sbin/killall -l FLAGS
The hyphen character (without an argument) sends a SIGTERM signal initially and then sends a SIGKILL signal to all processes that survive for 30 seconds after receipt of the first signal. This gives processes that catch the SIGTERM signal an opportunity to clean up. A signal name, optionally preceded by a hyphen, sends the specified signal to processes. The hyphen character (with a signal number argument) sends the specified signal, either a name, stripped of the SIG prefix (such as KILL), or a number (such as 9). For information about signal names and numbers, see the signal() system call. In the System V habitat, the optional signal number does not have to be preceded with a hyphen (-). Lists signal names in numerical order (as given in the /usr/include/signal.h file), stripped of the common SIG prefix. DESCRIPTION
This command provides a convenient means of killing all processes created by the shell that you control. When started by the superuser, the killall command kills all processes that can be terminated, except those processes that started it, the kernel processes, and processes 0 and 1 (init). Security Configuration This command is modified in all security configurations of the system. EXAMPLES
To stop all background processes that have started, enter: killall This sends all background processes signal 9 (the kill signal, also called SIGKILL). To stop all background processes, giving them a chance to clean up, enter: killall - This sends signal 15 (SIGTERM), waits 30 seconds, and then sends signal 9 (SIGKILL). To send a specific signal to the background processes, enter: killall -2 This sends signal 2 (SIGINT) to the background processes. To list the signal names in numerical order, stripped of the SIG prefix, enter: killall -l This displays a list of signals, which may vary from system to system. FILES
Specifies the command path RELATED INFORMATION
Calls: kill(2), sigaction(2), signal(2) delim off killall(8)
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