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(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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