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Annotation of researchv10dc/man/manb/vhangup.2v, revision 1.1.1.1

1.1       root        1: .TH VHANGUP 2V
                      2: .UC 4
                      3: .SH NAME
                      4: vhangup \- virtually ``hangup'' the current control terminal
                      5: .SH SYNOPSIS
                      6: .B vhangup()
                      7: .SH DESCRIPTION
                      8: .I Vhangup
                      9: is used by the initialization process
                     10: .IR init (8)
                     11: to arrange that users are given \*(lqclean\*(rq' terminals at login,
                     12: by revoking access of the previous users' processes to the terminal.
                     13: To effect this,
                     14: .I vhangup
                     15: searches the system tables for references to the control terminal
                     16: of the invoking process, revoking access permissions
                     17: on each instance of the terminal which it finds.
                     18: Further attempts to access the terminal by the affected processes
                     19: will yield i/o errors (EBADF).
                     20: Finally,
                     21: a hangup signal (SIGHUP) is sent to the process group of the
                     22: control terminal.
                     23: .SH SEE ALSO
                     24: init (8)
                     25: .SH BUGS
                     26: Access to
                     27: the control terminal via
                     28: .B /dev/tty
                     29: is still possible.
                     30: .PP
                     31: This call is peculiar to this version of UNIX.
                     32: The options and specifications of this system call and even the call itself
                     33: are subject to change.

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