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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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killpg(3) Library Functions Manual killpg(3)
killpg - send signal to a process group
Standard C library (libc, -lc)
#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 <= 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 to indicate the error.
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.
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 processes.
C library/kernel differences
On Linux, killpg() is implemented as a library function that makes
the call kill(-pgrp, sig).
POSIX.1-2008.
POSIX.1-2001, SVr4, 4.4BSD (first appeared in 4BSD).
getpgrp(2), kill(2), signal(2), capabilities(7), credentials(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-05-17 killpg(3)
Pages that refer to this page: kill(2), sigaction(2), signal(2), credentials(7), signal(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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