NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON
KILLPG(2) Linux Programmer's Manual KILLPG(2)
killpg - send signal to a process group
#include <signal.h>
int killpg(int pgrp, int sig);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
killpg(): _BSD_SOURCE || _XOPEN_SOURCE >= 500
killpg() sends the signal sig to the process group pgrp. See signal(7) for a
list of signals.
If pgrp is 0, killpg() sends the signal to the calling process's process
group. (POSIX says: If pgrp is less than or equal to 1, the behavior is
undefined.)
For a process to have permission to send a signal it must either be privileged
(under Linux: have the CAP_KILL capability), or the real or effective user ID
of the sending process must equal the real or saved set-user-ID of the target
process. In the case of SIGCONT it suffices when the sending and receiving
processes belong to the same session.
On success, zero is returned. On error, -1 is returned, and errno is set
appropriately.
EINVAL Sig is not a valid signal number.
EPERM The process does not have permission to send the signal to any of the
target processes.
ESRCH No process can be found in the process group specified by pgrp.
ESRCH The process group was given as 0 but the sending process does not have
a process group.
SVr4, 4.4BSD (the killpg() function call first appeared in 4BSD),
POSIX.1-2001.
There are various differences between the permission checking in BSD-type
systems and System V-type systems. See the POSIX rationale for kill(). 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.
On Linux, killpg() is implemented as a library function that makes the call
kill(-pgrp, sig).
getpgrp(2), kill(2), signal(2), capabilities(7), credentials(7)
This page is part of release 3.23 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
Linux 2007-07-26 KILLPG(2)