| KILLPG(3) | Library Functions Manual | KILLPG(3) | 
killpg —
#include <signal.h>
int
  
  killpg(pid_t
    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 single special case the continue signal SIGCONT may be sent to any process that is a descendant of the current process.
killpg() will fail and no signal will be sent if:
EINVAL]ESRCH]ESRCH]EPERM]killpg() function call appeared in
  4.0BSD.
| June 2, 1993 | NetBSD 9.3 |