KILLPG(3) Linux Programmer's Manual KILLPG(3)
killpg - send signal to a process group
int killpg(int pgrp, int sig);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_XOPEN_SOURCE >= 500
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 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, see
On success, zero is returned. On error, -1 is returned, and errno is
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. For the required permissions, see
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.
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(). 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
C library/kernel differences
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)
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Linux 2017-09-15 KILLPG(3)
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