Section: Linux Programmer's Manual (3)
killpg - send signal to a process group
int killpg(int pgrp, int sig);
Feature Test Macro Requirements for glibc (see
_XOPEN_SOURCE >= 500
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE
sends the signal
to the process group
for a list of signals.
sends the signal to the calling process's process group.
(POSIX says: if
is less than or equal to 1, the behavior is undefined.)
For the permissions required to send a signal to another process, see
On success, zero is returned.
On error, -1 is returned, and
is set appropriately.
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
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.
POSIX.1-2001, POSIX.1-2008, SVr4, 4.4BSD
first appeared in 4BSD).
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
BSD documents that no signal is sent and
returned when the permission check failed for at least one target process,
while POSIX documents
only when the permission check failed for all target processes.
C library/kernel differences
is implemented as a library function that makes the call
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