VHANGUP(2) System Calls VHANGUP(2)

NAME

vhangup - virtually "hangup" the current controlling terminal

SYNOPSIS

#include <unistd.h>

void vhangup(void);

DESCRIPTION

The vhangup() function is used by the initialization process init(8)
(among others) to ensure that users are given "clean" terminals at
login by revoking access of the previous users' processes to the
terminal. To effect this, vhangup() searches the system tables for
references to the controlling terminal of the invoking process and
revokes access permissions on each instance of the terminal that it
finds. Further attempts to access the terminal by the affected
processes will yield I/O errors (EBADF or EIO). A SIGHUP (hangup
signal) is sent to the process group of the controlling terminal.

SEE ALSO

init(8)

BUGS

Access to the controlling terminal using /dev/tty is still possible.


This call should be replaced by an automatic mechanism that takes
place on process exit.

March 19, 1998 VHANGUP(2)