ttyaction(3) - NetBSD Manual Pages

TTYACTION(3)            NetBSD Library Functions Manual           TTYACTION(3)


NAME

     ttyaction -- ttyaction utility function


LIBRARY

     System Utilities Library (libutil, -lutil)


SYNOPSIS

     #include <util.h>

     int
     ttyaction(char *ttyname, char *action, char *username);


DESCRIPTION

     The ttyaction() function is used by login(1), getty(8), telnetd(8) and
     rlogind(8) to execute site-specific commands when a login session begins
     and ends.

     The ttyaction() function scans the /etc/ttyaction file for any records
     that match the current ttyname and action parameters, and for each match-
     ing record, runs the shell command shown in that record.  The record for-
     mat is described in ttyaction(5).  The parameter username is the name of
     the new owner of the ttyname device.  Note that the ttyname parameter may
     be passed as a fully qualified pathname, and the ttyaction() function
     will skip the leading "/dev/" part of the string.  (This is a convenience
     for login and getty.)


RETURN VALUES

     ttyaction() returns the status of the last command it executed, or zero
     if no matching commands were found.


FILES

     /dev/*
     /etc/ttyaction


SEE ALSO

     ttyaction(5)


AUTHORS

     Gordon W. Ross <gwr@NetBSD.org>,
     Chris G. Demetriou <cgd@NetBSD.org>,
     Ty Sarna <tsarna@NetBSD.org>.


BUGS

     There should be some other mechanism to allow selection of different
     access control policies on a per-line basis.  It has been suggested that
     the same ttyaction() mechanism should also be used for determining access
     control, but it was decided (after much discussion) that ttyaction()
     should only describe actions to be performed after the system has decided
     to change the ownership of some tty.  Access control policies will be
     handled by a separate mechanism.

NetBSD 8.0                        May 4, 2010                       NetBSD 8.0