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KILLPG(2)                  Linux Programmer's Manual                 KILLPG(2)



NAME
       killpg - send signal to a process group

SYNOPSIS
       #include <&lt;signal.h>&gt;

       int killpg(int pgrp, int sig);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       killpg(): _BSD_SOURCE || _XOPEN_SOURCE >= 500

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 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.

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

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.

       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 3.05 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.



Linux                             2007-07-26                         KILLPG(2)