killpg man page on OpenBSD

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KILLPG(3)		  OpenBSD Programmer's Manual		     KILLPG(3)

NAME
     killpg - send signal to a process group

SYNOPSIS
     #include <signal.h>

     int
     killpg(pid_t pgrp, int sig);

DESCRIPTION
     killpg() sends the signal sig to the process group pgrp.  See
     sigaction(2) for a list of signals.  If pgrp is 0, killpg() sends the
     signal to the sending process's process group.

     The sending process and members of the process group must have the same
     effective user ID, or the sender must be the superuser.  As a single
     special case the continue signal SIGCONT may be sent to any process with
     the same session ID as the caller.

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

ERRORS
     killpg() will fail and no signal will be sent if:

     [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 superuser and one or more of
		   the target processes has an effective user ID different
		   from that of the sending process.

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

HISTORY
     The killpg() function call appeared in 4.0BSD.

OpenBSD 4.9			 May 31, 2007			   OpenBSD 4.9
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