killpg - send signal to a process group
int killpg(int pgrp, int sig);
_XOPEN_SOURCE >= 500
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc <= 2.19: */ _BSD_SOURCE
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 the permissions required to send a signal to another process,
On success, zero is returned. On error, -1 is returned, and errno is set
to indicate the error.
POSIX.1-2001, POSIX.1-2008, SVr4, 4.4BSD (killpg() first appeared in
There are various differences between the permission checking in BSD-type
systems and System V-type systems. See the POSIX rationale for
kill(3p). 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
On Linux, killpg() is implemented as a library function that makes the
call kill(-pgrp, sig).
This page is part of release 5.13 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the latest
version of this page, can be found at https://www.kernel.org/doc/man-pages/.
- sig is 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