LINEDISC(9)

💅 linedisc(9) — extensible line discipline framework 💅

okay so bestie, this page is from the Kernel Developer's Manual, section 9, and it’s giving “kernel modules deserve main character energy too.” We’re talking about the NetBSD TTY line discipline framework, and it is extensible. Periodt. 🫶

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🌸 NAME 🌸

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

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✨ 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);

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💖 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. Slay. ✨

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

Here’s the brief tea on each function in the framework, bestie:

• 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 disciplines this should be set to -1. Iconic registration moment. 🎀
• ttyldisc_lookup() — Look up a line discipline by name. NULL is returned if it can not be found. Vibe check failed? You get NULL. 😭
• 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. Bye bestie, but make it safe. 💅

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🦋 SEE ALSO 🦋

• tty(4) — go read this too, bestie 🫶

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🎀 HISTORY 🎀

The linedisc functions were added in NetBSD 1.6. That’s the lore. 🌈

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👑 AUTHORS 👑

The NetBSD extensible line discipline framework was created by Eduardo Horvath ⟨eeh@NetBSD.org⟩. We stan a framework creator. 👑

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mwah 💋 this page’s footer energy is Debian, dated November 1, 2000 — that’s the source/version and date, bestie. Periodt. 🌸