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():
- _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
kill(2).
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. For the required permissions, see kill(2).
- 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
4BSD).
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)