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RedHat 9 (Linux i386) - man page for killpg (redhat section 2)

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

killpg - send signal to a process group
#include <signal.h> int killpg(int pgrp, int sig);
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 sin- gle special case the continue signal SIGCONT 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 errno is set appropriately.
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.
SVr4, 4.4BSD (The killpg function call first appeared in 4.0BSD).
kill(2), getpgrp(2), signal(2) BSD Man Page 1993-07-23 KILLPG(2)