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

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

NAME
vhangup - virtually hangup the current tty
SYNOPSIS
#include <unistd.h> int vhangup(void);
DESCRIPTION
vhangup simulates a hangup on the current terminal. This call arranges for other users to have a "clean" tty at login time.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EPERM The user is not the super-user.
CONFORMING TO
This call is Linux-specific, and should not be used in programs intended to be portable.
SEE ALSO
init(8) Linux 0.99.11 1993-07-24 VHANGUP(2)