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Annotation of 43BSDTahoe/man/man2/vhangup.2, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1980 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)vhangup.2   6.2 (Berkeley) 6/30/85
                      6: .\"
                      7: .TH VHANGUP 2 "June 30, 1985"
                      8: .UC 4
                      9: .SH NAME
                     10: vhangup \- virtually ``hangup'' the current control terminal
                     11: .SH SYNOPSIS
                     12: .B vhangup()
                     13: .SH DESCRIPTION
                     14: .I Vhangup
                     15: is used by the initialization process
                     16: .IR init (8)
                     17: (among others) to arrange that users are given
                     18: \*(lqclean\*(rq' terminals at login,
                     19: by revoking access of the previous users' processes to the terminal.
                     20: To effect this,
                     21: .I vhangup
                     22: searches the system tables for references to the control terminal
                     23: of the invoking process, revoking access permissions
                     24: on each instance of the terminal that it finds.
                     25: Further attempts to access the terminal by the affected processes
                     26: will yield i/o errors (EBADF).
                     27: Finally,
                     28: a hangup signal (SIGHUP) is sent to the process group of the
                     29: control terminal.
                     30: .SH SEE ALSO
                     31: init (8)
                     32: .SH BUGS
                     33: Access to
                     34: the control terminal via
                     35: .B /dev/tty
                     36: is still possible.
                     37: .PP
                     38: This call should be replaced by an automatic mechanism that
                     39: takes place on process exit.

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