fd9d392416
- /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
41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
#pragma once
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// Pseudo-terminals, Unix98 style: open /dev/ptmx and get the master side of a
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// new pair; the slave is /dev/pts/N. What sits between the two is the same
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// line discipline a console has. See kernel/dev/pty.c.
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#include "core/types.h"
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#define PTMX_MAJOR 13 // /dev/ptmx: opening it allocates a pair
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#define PTM_MAJOR 14 // a master, minor = pair number; never in a listing
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#define PTS_MAJOR 15 // /dev/pts/N
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#define NPTY 32
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// A controlling terminal that is a pty, in proc->ctty: PTY_CTTY + N. The
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// console's are 1..NVT.
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#define PTY_CTTY 64
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struct inode;
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struct file;
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int pty_alloc(void); // the new pair's number, or -1
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int pty_used(int n);
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int pty_ioctl(struct inode *ip, uint request, addr_t arg);
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int pty_poll(struct inode *ip, int events, int readable, int writable);
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struct inode *ptmx_open(struct inode *ip); // ip locked; returns the master, locked
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void pty_init(void);
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// Lines the devsw table needs.
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int ptm_read(struct inode*, uint64, char*, int);
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int ptm_write(struct inode*, uint64, char*, int);
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int ptm_ready(struct inode*);
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void ptm_open(struct inode*);
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void ptm_close(struct inode*);
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int pts_read(struct inode*, uint64, char*, int);
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int pts_write(struct inode*, uint64, char*, int);
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int pts_ready(struct inode*);
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void pts_open(struct inode*);
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void pts_close(struct inode*);
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// From kernel/fs/devfs.c: the inode of master N.
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struct inode *devfs_pty_master(int n);
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