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Pseudo-terminals, and what tmux and htop needed around them

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- /dev/ptmx and /dev/pts/N: Unix98 pairs with a full line discipline,
  window sizes, job control and hangup (kernel/dev/pty.c).
- The console speaks scroll regions, insert/delete line, SU/SD, RI/IND/NEL,
  DECSC/DECRC; swallows charset designations and private CSI sequences;
  and LF only returns the carriage under ONLCR.
- setsid() drops the controlling terminal, so a pane's pty becomes its ctty.
- pipe2() honours O_NONBLOCK and O_CLOEXEC (libevent's signal pipe).
- File modes are stored and enforced: chmod, fchmod(at), umask, creation
  modes; /tmp is 1777.
- /proc/stat has real user/system/idle; /proc/<pid>/task; kthread flag.
- SO_PEERCRED, IOV_MAX 1024.
- /proc/strace: name a program and its syscalls go to the kernel log.
- World gains htop, btop, tmux, mc, ncdu, fastfetch, games, X toys, NetSurf.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
This commit is contained in:
Nexoniarz 2026-10-25 02:11:10 +01:00
commit fd9d392416
28 changed files with 1577 additions and 47 deletions
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41
include/dev/pty.h Normal file
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@ -0,0 +1,41 @@
#pragma once
// Pseudo-terminals, Unix98 style: open /dev/ptmx and get the master side of a
// new pair; the slave is /dev/pts/N. What sits between the two is the same
// line discipline a console has. See kernel/dev/pty.c.
#include "core/types.h"
#define PTMX_MAJOR 13 // /dev/ptmx: opening it allocates a pair
#define PTM_MAJOR 14 // a master, minor = pair number; never in a listing
#define PTS_MAJOR 15 // /dev/pts/N
#define NPTY 32
// A controlling terminal that is a pty, in proc->ctty: PTY_CTTY + N. The
// console's are 1..NVT.
#define PTY_CTTY 64
struct inode;
struct file;
int pty_alloc(void); // the new pair's number, or -1
int pty_used(int n);
int pty_ioctl(struct inode *ip, uint request, addr_t arg);
int pty_poll(struct inode *ip, int events, int readable, int writable);
struct inode *ptmx_open(struct inode *ip); // ip locked; returns the master, locked
void pty_init(void);
// Lines the devsw table needs.
int ptm_read(struct inode*, uint64, char*, int);
int ptm_write(struct inode*, uint64, char*, int);
int ptm_ready(struct inode*);
void ptm_open(struct inode*);
void ptm_close(struct inode*);
int pts_read(struct inode*, uint64, char*, int);
int pts_write(struct inode*, uint64, char*, int);
int pts_ready(struct inode*);
void pts_open(struct inode*);
void pts_close(struct inode*);
// From kernel/fs/devfs.c: the inode of master N.
struct inode *devfs_pty_master(int n);

6
include/dev/vt.h
View file

@ -82,7 +82,7 @@ struct vtcell {
// Escape parser states. E_OSC and E_OSC_ESC exist for hyperlinks: a terminal
// that does not follow OSC 8 must still consume it, or the URL is printed as
// text. See the comment in kernel/core/console.c that this came from.
enum { VE_NORMAL, VE_ESC, VE_CSI, VE_OSC, VE_OSC_ESC };
enum { VE_NORMAL, VE_ESC, VE_CSI, VE_OSC, VE_OSC_ESC, VE_CHARSET };
struct vt {
int index; // 0-based; /dev/tty<index+1>
@ -98,6 +98,10 @@ struct vt {
// CR, LF, backspace, an escape sequence -- clears it.
int wrap_pending;
int saved_cx, saved_cy; // DECSC/DECRC
// The scrolling region, DECSTBM: rows scroll_top..scroll_bot inclusive.
// scroll_bot 0 means unset, the whole screen -- which keeps a grid resized
// underneath it from holding a stale bottom.
int scroll_top, scroll_bot;
uint8 fg, bg; // current SGR colours
int bold;