LINEDISC(9)						   BSD Kernel Developer's Manual					       LINEDISC(9)

NAME

     linedisc, ttyldisc_add, ttyldisc_lookup, ttyldisc_remove -- extensible line discipline framework

SYNOPSIS

     #include <sys/conf.h>

     int
     ttyldisc_add(struct linesw *disc, int no);

     struct linesw *
     ttyldisc_remove(const char *name);

     struct linesw *
     ttyldisc_lookup(const char *name);

DESCRIPTION

     The NetBSD TTY line discipline framework allows extensibility.  Modules that need special line disciplines can add them as convenient and do
     not need to modify tty_conf.c.  Line disciplines are now managed by a string, rather than number.

     Once the framework has been initialized, a new line discipline can be added by creating and initializing a struct linesw and calling
     ttyldisc_add().

     The following is a brief description of each function in the framework:

     ttyldisc_add()	Register a line discipline.  The l_name field of the struct linesw should point to a string which is to be the symbolic
			name of that line discipline.  For compatibility purposes, a line discipline number can be passed in no, but for new dis-
			ciplines this should be set to -1.

     ttyldisc_lookup()	Look up a line discipline by name.  NULL is returned if it can not be found.

     ttyldisc_remove()	Remove a line discipline called name and return a pointer to it.  If the discipline cannot be found or removed
			ttyldisc_remove() will return NULL.

SEE ALSO

     tty(4)

HISTORY

     The linedisc functions were added in NetBSD 1.6.

AUTHORS

     The NetBSD extensible line discipline framework was created by Eduardo Horvath <eeh@NetBSD.org>.

BSD
								 November 1, 2000							       BSD