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Previously command-not-found(1) encoded all its suggestions in code.
This changes it to use a data table to make it easier to understand and
to modify with new suggestions.

This bug was reported by Ricardo Grant.

Historically tail(1) used `tail -1` style syntax, but this has been
obsoleted by the modern conventional-style `tail -n 1`.

Thanks to samis for discovering this problem and the initial attempt at
fixing it.

This functionality is needed for ports such as perl that needs
perl-cross extracted on top of it.

The idle thread is now actually run when the system is idle because it
truly goes idle. The idle thread is made power efficient by using the hlt
instruction rather than a busy loop.

The new futex(2) system call is used to implement fast user-space mutexes,
condition variables, and semaphores. The same backend and design is used as
kutexes for truly sleeping kernel mutexes and condition variables.

The new exit_thread(2) flag EXIT_THREAD_FUTEX_WAKE wakes a futex.

Sleeping on clocks in the kernel now uses timers for true sleep.

The interrupt worker thread now truly sleeps when idle.

Kernel threads are now named.

This is a compatible ABI change.

Support zero relative and absolute times in the timer API.

It seems that CD-ROMs with MBRs count number of 512 bytes rather than number
of 2048-byte sectors.

The <pwd.h> and <grp.h> family of functions are supposed to return
nothing with no error set if there is no matching entry.

b commonly corresponds to Page Up, and f is added to match.

j and k for lines, ^F and ^B for pages, and g and G for home/end are from vi.

C-n and C-p for lines and C-v and M-v for pages are from Emacs.

< and > for home/end allow using Emacs M-< and M->, tho they are from less(1).

Juhani Krekelä authored Apr 27, 2021 and Jonas Termansen committed May 02, 2021

Since this is a console program, ctrl + letter gets mapped to a
control character in the range 1 to 26. Most of these control
characters are no longer in use and can safely be assumed to be
result of ctrl + letter, but ^I maps to the tab character.

I chose ^G since the keybind is memorable, and a user is unlikely
to try to type the BEL character.

Juhani Krekelä authored Apr 27, 2021 and Jonas Termansen committed May 02, 2021

While under Sortix these operations ought to be safe, UBSan will
complain regardless if you do a zero-byte memmove from NULL. This
caused the editor forcibly quit whenever it tried to open a file
that had an empty first line and at least one another line.