include/linux/tty_ldisc.h

1 /* SPDX-License-Identifier: GPL-2.0 */
58  * struct tty_ldisc_ops - ldisc operations
68  *	by the ldisc, and set @tty->receive_room to the maximum amount of data
87  *	input characters it may have queued to be delivered to the user mode
95  *	This function is called when the user requests to read from the @tty.
97  *	for the user. If this function is not defined, the user will receive
106  *	This function is called when the user requests to write to the @tty.
107  *	The line discipline will deliver the characters to the low-level tty
109  *	characters first. If this function is not defined, the user will
117  *	This function is called when the user requests an ioctl which is not
118  *	handled by the tty layer or the low-level tty driver. It is intended
120  *	order for ioctls is (1) tty layer, (2) tty low-level driver, (3) line
121  *	discpline. So a low-level driver can "grab" an ioctl request before
129  *	Process ioctl calls from 32-bit process on 64-bit system.
132  *	structure" nor tty-generic.  Something private that takes an integer or
133  *	a pointer to wordsize-sensitive structure belongs here, but most of
148  *	This function is called when a user attempts to select/poll on a @tty
166  *	This function is called by the low-level tty driver to send characters
177  *	This function is called by the low-level tty driver to signal that line
178  *	discpline should try to send more characters to the low-level driver
189  *	exclusively by the %N_PPS (Pulse-Per-Second) line discipline.
196  *	This function is called by the low-level tty driver to send characters
209  *	This function is called by the low-level tty driver for characters
210  *	not eaten by ->receive_buf() or ->receive_buf2(). It is useful for
211  *	processing high-priority characters such as software flow-control
214  *	handle later a ->receive_buf() or ->receive_buf2() call for the
215  *	same characters (e.g. by skipping the actions for high-priority
216  *	characters already handled by ->lookahead_buf()).
274 	MODULE_ALIAS("tty-ldisc-" __stringify(ldisc))