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

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