killpg man page on Archlinux

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

       killpg - send signal to a process group

       #include <signal.h>

       int killpg(int pgrp, int sig);

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

	   _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||

       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.

       On  success,  zero is returned.	On error, -1 is returned, and errno is
       set appropriately.

       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.

       SVr4, 4.4BSD (the killpg()  function  call  first  appeared  in	4BSD),

       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

       On  Linux, killpg() is implemented as a library function that makes the
       call kill(-pgrp, sig).

       getpgrp(2), kill(2), signal(2), capabilities(7), credentials(7)

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

Linux				  2010-09-20			     KILLPG(2)

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