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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killall(1M) killall(1M)
NAME
killall - kill all active processes
SYNOPSIS
[signal]
DESCRIPTION
is a procedure used by to kill all active processes not directly related to the shutdown procedure.
is chiefly used to terminate all processes with open files so that the mounted file systems are no longer busy and can be unmounted. sends
the specified signal to all user processes in the system, with the following exceptions:
the process;
all processes (including background processes) associated with the terminal from which was invoked;
any process, if owned by
any process, if owned by
any process;
any process;
any process.
obtains its process information from and therefore may not be able to perfectly identify which processes to signal (see ps(1)).
If no signal is specified, a default of (kill) is used.
is invoked automatically by The use of is recommended over using by itself (see shutdown(1M)).
FILES
SEE ALSO
fuser(1M), kill(1), ps(1), shutdown(1M), signal(5).
STANDARDS CONFORMANCE
killall(1M)