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 super-user. As a single
special case the continue signal
SIGCONT may be sent to any process that is a descendant of the current process.
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.
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.
CONFORMING TO
SVr4, 4.4BSD (The
killpg function call first appeared in 4.0BSD).
