killpg(2)
NAME
killpg − send signal to process or process group
SYNTAX
killpg(pgrp, sig)
int pgrp, sig;
DESCRIPTION
The killpg system call sends the signal sig to the process group pgrp. See sigvec() for a list of signals.
The sending process and members of the process group must have the same effective user ID, otherwise this call is restricted to the super-user. As a single special case the continue signal SIGCONT may be sent to any process which is a descendant of the current process.
RETURN VALUE
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.
DIAGNOSTICS
The killpg system call will fail and no signal will be sent if any of the following occur:
[EINVAL]
The sig is not a valid signal number.
[ESRCH]
No process can be found corresponding to that specified by pid.
[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.