SIMPLE SOLUTIONS

KILLPG(2) - man page online | system calls

Send signal to a process group.

Chapter
2015-07-23
KILLPG(2)                           Linux Programmer's Manual                           KILLPG(2)

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(): _BSD_SOURCE || _XOPEN_SOURCE >= 500 || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
DESCRIPTION killpg() sends the signal sig to the process group pgrp. See signal(7) for a list of sig‐ nals. 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 a process to have permission to send a signal it must either be privileged (under Linux: have the CAP_KILL capability), or the real or effective user ID of the sending process must equal the real or saved set-user-ID of the target process. In the case of SIGCONT it suffices when the sending and receiving processes belong to the same session.
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 pro‐ cesses. 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 Sys‐ tem 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 4.04 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 http://www.kernel.org/doc/man-pages/.
Linux 2015-07-23 KILLPG(2)
This manual Reference Other manuals
killpg(2) referred by credentials(7) | kill(2) | kill(2freebsd) | killpg(2freebsd) | sigaction(2) | signal(2) | signal(7) | tcsh(1)
refer to capabilities(7) | credentials(7) | feature_test_macros(7) | kill(2) | setpgid(2) | signal(2) | signal(7)