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