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(1M) (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 refer-
ences 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(1M)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.
SunOS 5.11 19 Mar 1998 vhangup(2)
Check Out this Related Man Page
VHANGUP(2) Linux Programmer's Manual VHANGUP(2)NAME
vhangup - virtually hangup the current tty
SYNOPSIS
#include <unistd.h>
int vhangup(void);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
vhangup(): _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
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 calling process has insufficient privilege to call vhangup(); the CAP_SYS_TTY_CONFIG capability is required.
CONFORMING TO
This call is Linux-specific, and should not be used in programs intended to be portable.
SEE ALSO capabilities(7), init(8)COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2007-07-26 VHANGUP(2)
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