KILLPG(2) — SYSTEM CALLS

NAME

killpg − send signal to a process group

SYNOPSIS

int killpg(pgrp, sig)

int pgrp, sig;

DESCRIPTION

killpg() sends the signal sig to the process group pgrp. See sigvec(2) for a list of signals.

The real or effective user ID of the sending process must match the real or saved set-user ID of the receiving process, unless the effective user ID of the sending process is super-user. A single exception is the signal SIGCONT, which may always be sent to any 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.

ERRORS

killpg() will fail and no signal will be sent if any of the following occur:

EINVAL sig is not a valid signal number.

ESRCH No processes were found in the specified process group.

EPERM The effective user ID of the sending process is not super-user, and neither its real nor effective user ID matches the real or saved set-user ID of one or more of the target processes.

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