bsd man page for killpg

KILLPG(2)							System Calls Manual							 KILLPG(2)

NAME
       killpg - send signal to a process group

SYNOPSIS
       killpg(pgrp, sig)
       int pgrp, sig;

DESCRIPTION
       Killpg sends the signal sig to the process group pgrp.  See sigvec(2) for a list of signals.

       The sending process and members of the process group must have the same effective user ID, or the sender must be the super-user.  As a sin-
       gle special case the continue signal SIGCONT may be sent to any process that is a descendant of the current process.

RETURN VALUE
       Upon successful completion, a value of 0 is returned.  Otherwise, a value of -1 is returned and the global variable errno is set  to  indi-
       cate the error.

ERRORS
       Killpg will fail and no signal will be sent if any of the following occur:

       [EINVAL]       Sig is not a valid signal number.

       [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.

       [EPERM]	      The  sending  process  is not the super-user and one or more of the target processes has an effective user ID different from
		      that of the sending process.

SEE ALSO
       kill(2), getpgrp(2), sigvec(2)

4th Berkeley Distribution					   May 14, 1986 							 KILLPG(2)