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(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)