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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);

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

       killpg():
	   _BSD_SOURCE || _XOPEN_SOURCE	>= 500 ||
	   _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED

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 3.74 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
       http://www.kernel.org/doc/man-pages/.

Linux				  2010-09-20			     KILLPG(2)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

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