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);

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
       sending process's process group.

       (POSIX says: If pgrp is less than or equal to 1, the behaviour is unde-
       fined.)

       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 processes.

       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.

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.

CONFORMING TO
       SVr4, 4.4BSD (The killpg()  function  call  first  appeared  in  4BSD),
       POSIX.1-2001.

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

BSD Man Page                      2004-06-21                         KILLPG(2)