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Job control, function keys, and real sleeps

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- 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
This commit is contained in:
Nexoniarz 2026-10-25 02:37:45 +01:00
commit 2372806862
13 changed files with 366 additions and 42 deletions
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25
kernel/core/console.c
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@ -624,6 +624,21 @@ consoleintr(int (*getc)(void))
case KBD_PGDN: esc = "\033[6~"; break;
case KBD_INS: esc = "\033[2~"; break;
case KBD_DEL: esc = "\033[3~"; break;
// The function keys, as the Linux console sends them -- the strings
// the `linux` terminfo entry lists. Nothing sent them at all, so mc's
// F10 never quit and htop's F-key bar was decoration.
case KBD_F1: esc = "\033[[A"; break;
case KBD_F1 + 1: esc = "\033[[B"; break;
case KBD_F1 + 2: esc = "\033[[C"; break;
case KBD_F1 + 3: esc = "\033[[D"; break;
case KBD_F1 + 4: esc = "\033[[E"; break;
case KBD_F1 + 5: esc = "\033[17~"; break;
case KBD_F1 + 6: esc = "\033[18~"; break;
case KBD_F1 + 7: esc = "\033[19~"; break;
case KBD_F1 + 8: esc = "\033[20~"; break;
case KBD_F1 + 9: esc = "\033[21~"; break;
case KBD_F1 + 10: esc = "\033[23~"; break;
case KBD_F12: esc = "\033[24~"; break;
}
if (esc) {
// Not echoed. In raw mode -- which is where a line editor lives, and
@ -727,6 +742,16 @@ consoleread(struct inode *ip, uint64 off, char *dst, int n)
ilock(ip);
return -EINTR;
}
if (sig_attention(myproc())) { // Ctrl-Z, or a handler to run
release(&input_lock);
int e = sig_blocking_check();
if (e) {
ilock(ip);
return e;
}
acquire(&input_lock);
continue;
}
sleep(&v->in.r, &input_lock);
}
c = v->in.buf[v->in.r++ % VT_INPUT_BUF];