KILLPG
Section: Linux Programmer's Manual (3)
Updated: 2017-09-15
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NAME
killpg - send signal to a process group
SYNOPSIS
#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
DESCRIPTION
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).
RETURN VALUE
On success, zero is returned.
On error, -1 is returned, and
errno
is set appropriately.
ERRORS
- 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.
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, SVr4, 4.4BSD
(
killpg()
first appeared in 4BSD).
NOTES
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.
C library/kernel differences
On Linux,
killpg()
is implemented as a library function that makes the call
kill(-pgrp, sig).
SEE ALSO
getpgrp(2),
kill(2),
signal(2),
capabilities(7),
credentials(7)
COLOPHON
This page is part of release 4.13 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- NOTES
-
- C library/kernel differences
-
- SEE ALSO
-
- COLOPHON
-
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