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Full Discussion: Kill all process by UID
Top Forums UNIX for Advanced & Expert Users Kill all process by UID Post 302560928 by alister on Sunday 2nd of October 2011 01:20:43 PM
Old 10-02-2011
Quote:
Originally Posted by DendyGamer
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?
What are you trying to accomplish or prevent?

As far as killing all processes with a given euid or ruid, for that OpenBSD provides pkill.

Yes, there's a race between the time the list of matching processes is retrieved (using the kernel virtual memory library's kvm_getprocs() interface) and the time pkill sends the processes a signal, during which a process can fork or change uid.

I suppose you can run pkill multiple times until it returns an exit status of 1 (no processes match the criteria).

Again, more info about the situation will probably help us help you.

Regards,
Alister

Last edited by alister; 10-02-2011 at 06:25 PM.. Reason: typo
 

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kill(1) 						      General Commands Manual							   kill(1)

Name
       kill - send a signal to a process

Syntax
       kill [-sig] processid...
       kill -l

Description
       The command sends the TERM (terminate, 15) signal to the specified processes.  If a signal name or number preceded by `-' is given as first
       argument, that signal is sent instead of terminate.  For further information, see

       The terminate signal kills processes that do not catch the signal; `kill -9 ...' is a sure kill, as the KILL (9) signal cannot  be  caught.
       By convention, if process number 0 is specified, all members in the process group (that is, processes resulting from the current login) are
       signaled.  This works only if you use and not if you use To kill a process it must either belong to you or you must be superuser.

       The process number of an asynchronous process started with `&' is reported by the shell.  Process numbers can also be  found  by  using	It
       allows job specifiers ``%...''  so process ID's are not as often used as arguments.  See for details.

Options
       -l   Lists  signal  names.  The signal names are listed by `kill -l', and are as given in /usr/include/signal.h, stripped of the common SIG
	    prefix.

See Also
       csh(1), ps(1), kill(2), sigvec(2)

																	   kill(1)
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