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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 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 4.15 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                             2017-09-15                         KILLPG(3)