killpg

KILLPG(3)                   Linux Programmer's Manual                  KILLPG(3)



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 <= 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
       to indicate the error.

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(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).

SEE ALSO
       getpgrp(2), kill(2), signal(2), capabilities(7), credentials(7)

COLOPHON
       This page is part of release 5.13 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/.



Linux                              2021-03-22                          KILLPG(3)