killpg - send signal to a process group

sends the signal to the process group See for a list of signals. If is 0, 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 may be sent to any process that is a descendant of the current process. On success, zero is returned. On error, -1 is returned, and is set appropriately.

ERRORS
is not a valid signal number. No process can be found in the process group specified by The process group was given as 0 but the sending process does not have a process group. 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. The function call appeared in BSD4.0.