2372806862
- SIGSTOP/SIGTSTP/SIGTTIN/SIGTTOU stop, SIGCONT resumes; the parent gets SIGCHLD and wait4 reports WUNTRACED/WCONTINUED; ps shows T. Ctrl-Z works, and mc no longer hangs waiting for its subshell to stop. - Blocking reads (console, pty, pipe) and sleeps take a pending stop and carry on after SIGCONT; a caught signal without SA_RESTART ends them with EINTR. - nanosleep reads tv_nsec (sleep 0.5 used to return at once), writes the remainder, and clock_nanosleep understands TIMER_ABSTIME. - rt_sigaction uses the k_sigaction layout for Linux-ABI processes: the old action's restorer was written 112 bytes past the caller's struct. Flags are kept; SIGKILL and SIGSTOP cannot be caught. - F1..F12 reach programs, as the Linux console sends them (PS/2, USB, I2C). - TIOCLINUX subcode 6 answers "no modifiers" instead of echoing the 6 back. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
118 lines
5.1 KiB
C
118 lines
5.1 KiB
C
// PC keyboard interface constants
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//
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// The scancode tables themselves are no longer here. They moved to
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// kernel/dev/keymap.c when there became more than one of them -- a header
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// full of `static` arrays gives every file that includes it its own private
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// copy, which was harmless while exactly one file did.
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#ifndef KBD_H
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#define KBD_H
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#define KBSTATP 0x64 // kbd controller status port(I)
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#define KBS_DIB 0x01 // kbd data in buffer
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#define KBDATAP 0x60 // kbd data port(I)
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#define NO 0
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#define SHIFT (1<<0)
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#define CTL (1<<1)
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#define ALT (1<<2)
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#define CAPSLOCK (1<<3)
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#define NUMLOCK (1<<4)
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#define SCROLLLOCK (1<<5)
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#define E0ESC (1<<6)
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// Right Alt, tracked apart from left Alt.
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//
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// They used to be the same bit, which is fine for typing -- neither is used to
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// look up a character -- and wrong for chords. On a Polish layout AltGr is how
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// you type a c e l n o s x z with their diacritics, and it is held constantly.
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// Nothing the kernel binds may involve it.
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#define RALT (1<<7)
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// Special keycodes.
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//
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// **Above every Unicode codepoint, deliberately**, and they did not use to be:
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// KBD_UP was 0xE2 and its neighbours filled 0xE0..0xE9. Those are exactly the
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// UTF-8 lead bytes for three-byte characters, so typing any of U+0800..U+FFFF
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// -- which is most punctuation, every arrow, every maths symbol, and the whole
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// of CJK -- produced a keycode the console read as an arrow key and turned
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// into `ESC [ A`. `∞`, `→`, `≤` and `'` all vanished from the input line while
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// `ą` and `ę` came through, because those are two-byte sequences whose lead
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// byte is 0xC4 and nothing claimed 0xC4.
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//
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// The chord codes below already knew this rule and said so; the navigation
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// keys predate them and were never brought in line. The rule, stated once: a
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// value that a key produces is either a Unicode codepoint or it is above
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// 0x10FFFF, and nothing in between means anything.
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#define KBD_SPECIAL 0x110000
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#define KBD_HOME (KBD_SPECIAL + 0x00)
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#define KBD_END (KBD_SPECIAL + 0x01)
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#define KBD_UP (KBD_SPECIAL + 0x02)
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#define KBD_DN (KBD_SPECIAL + 0x03)
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#define KBD_LF (KBD_SPECIAL + 0x04)
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#define KBD_RT (KBD_SPECIAL + 0x05)
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#define KBD_PGUP (KBD_SPECIAL + 0x06)
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#define KBD_PGDN (KBD_SPECIAL + 0x07)
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#define KBD_INS (KBD_SPECIAL + 0x08)
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#define KBD_DEL (KBD_SPECIAL + 0x09)
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// F1..F12, consecutive: KBD_F1 + n is F(n+1).
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#define KBD_F1 (KBD_SPECIAL + 0x10)
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#define KBD_F12 (KBD_SPECIAL + 0x1B)
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// Switch virtual terminal.
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//
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// *Which* chord is a runtime setting, not a constant here, and that is the
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// interesting part. Three separate parties have a claim on every candidate:
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//
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// the HOST, which sees the keystroke first and may never pass it on
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// Alt+F4, Alt+F2 window manager
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// Ctrl+Alt+F1..F6 display manager, and it matches loosely --
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// adding Shift does not get past it
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// Ctrl+Alt+<digit> QEMU's own console tabs
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//
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// APPLICATIONS, which lose the key permanently if the kernel eats it
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// Alt+<anything> Meta. zsh binds Meta-digit as digit-argument
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// Ctrl+<letter> control characters
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// Ctrl+Shift+<digit> types a character -- Ctrl+Shift+2 is ^@
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// F1..F6 alone help, and full-screen programs
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//
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// the KEYBOARD LAYOUT
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// AltGr+<letter> Polish diacritics, and on some setups AltGr
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// arrives as Ctrl+Alt
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//
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// There is no combination that is free for everyone on every host, and the
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// guest cannot find out what its host grabs -- the keystroke simply never
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// arrives, which is indistinguishable from a chord nobody pressed. So the
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// kernel ships a default and lets it be changed: VT_SETCHORD, and `chvt -c`
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// in userspace. Setting it to no modifiers disables the chord entirely and
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// leaves `chvt N` as the only way to switch, which is a legitimate choice on
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// a machine whose host takes everything.
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//
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// The default is AltGr+F1..F6, and the "AltGr wants it" line above needs
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// reading carefully: what a Polish layout wants is AltGr+*letter*. AltGr with
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// a function key produces nothing on any layout, no window manager binds it,
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// and no application asks for it. Right Alt being a separate modifier bit
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// here is what makes the distinction expressible at all -- it used to share
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// ALT, which is harmless for typing and useless for this.
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#define KBD_VT_SWITCH (KBD_SPECIAL + 0x20)
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// Previous / next terminal, on the same modifiers as the chord above. The
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// minus and equals keys, which sit together and read as - and + -- a relative
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// move for when you have two terminals and do not care which number they are.
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#define KBD_VT_PREV (KBD_SPECIAL + 0x30)
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#define KBD_VT_NEXT (KBD_SPECIAL + 0x31)
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#define SCAN_MINUS 0x0C // - / _
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#define SCAN_EQUALS 0x0D // = / +
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#define SCAN_F1 0x3B // F1..F6 are scancodes 0x3B..0x40
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#define SCAN_1 0x02 // 1..6 are scancodes 0x02..0x07
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// C('A') == Control-A
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#define C(x) (x - '@')
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#endif /* KBD_H */
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