Section (3) killpg
killpg — send signal to a process group
killpg() sends the signal
sig to the process
signal(7) for a list of
pgrp is 0,
killpg() sends the signal to
the calling process_zsingle_quotesz_s process group. (POSIX says: if
pgrp is less than or
equal to 1, the behavior is undefined.)
For the permissions required to send a signal to another process, see kill(2).
On success, zero is returned. On error, −1 is
errno is set
sigis not a valid signal number.
The process does not have permission to send the signal to any of the target processes. For the required permissions, see kill(2).
No process can be found in the process group specified by
The process group was given as 0 but the sending process does not have a process group.
There are various differences between the permission
checking in BSD-type systems and System V-type systems. See
the POSIX rationale for
A difference not mentioned by POSIX concerns the return value
EPERM: BSD documents that no
signal is sent and EPERM
returned when the permission check failed for at least one
target process, while POSIX documents EPERM only when the permission check
failed for all target processes.
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(#)killpg.2 6.5 (Berkeley) 3/10/91
Modified Fri Jul 23 21:55:01 1993 by Rik Faith <faithcs.unc.edu>
Modified Tue Oct 22 08:11:14 EDT 1996 by Eric S. Raymond <esrthyrsus.com>
Modified 2004-06-16 by Michael Kerrisk <mtk.manpagesgmail.com>
Added notes on CAP_KILL
Modified 2004-06-21 by aeb