New options:
-1 Disable columnizing.
-c Sort by file status change time.
-C Column directory entries.
-h Show file sizes with magnitude suffixes such as 42.3K.
-r Sort entries in the opposite order.
-R Recursively list directory contents.
-S Sort by file size in decreasing order.
-u Sort by access time.
--color=always|auto|never
Control whether colorizing is enabled.
The output is now natively columnized instead of running a column(1)
subprocess. Multiple operands are now implemented correctly (directory
contents are columned separately rather than their concatenation, the name
of each directory is printed prior to its content, ...). The file owner and
group names are now shown rather than a hard-coded root. Long listings are
now properly aligned. Mixing file and directory operands works correctly
now. Columnizing is now vertical rather than across. Clean up the source
code and remove cruft. Stat information on directory entries are read once
only now, which which fixes an incosistent sort race condition when sorting
according to lstat. Move to the openat paradigm.
I originally left them out because Sortix doesn't have setuid and setgid
executable support, but this created considerable compatibility issues and
it is better to supply them as the mode bits still exist and can be set.
This commit got completely out of control.
Added the fork(), getpid(), getppid(), sleep(), usleep() system calls, and
aliases in the Maxsi:: namespace.
Fixed a bug where zero-byte allocation would fail.
Worked on the DescriptorTable class which now works and can fork.
Got rid of some massive print-registers statements and replaced them with
the portable InterruptRegisters::LogRegisters() function.
Removed the SysExecuteOld function and replaced it with Process::Execute().
Rewrote the boot sequence in kernel.cpp such that it now loads the system
idle process 'idle' as PID 0, and the initization process 'init' as PID 1.
Rewrote the SIGINT hack.
Processes now maintain a family-tree structure and keep track of their
threads. PIDs are now allocated using a simple hack. Virtual memory
per-process can now be allocated using a simple hack. Processes can now be
forked. Fixed the Process::Execute function such that it now resets the
stack pointer to where the stack actually is - not just a magic value.
Removed the old and ugly Process::_endcodesection hack.
Rewrote the scheduler into a much cleaner and faster version. Debug code is
now moved to designated functions. The noop kernel-thread has been replaced
by a simple user-space infinite-loop program 'idle'.
The Thread class has been seperated from the Scheduler except in Scheduler-
related code. Thread::{Save,Load}Registers has been improved and has been
moved to $(CPU)/thread.cpp. Threads can now be forked. A new CreateThread
function creates threads properly and portably.
Added a MicrosecondsSinceBoot() function.
Fixed a crucial bug in MemoryManagement::Fork().
Added an 'idle' user-space program that is a noop infinite loop, which is
used by the scheduler when there is nothing to do.
Rewrote the 'init' program such that it now forks off a shell, instead of
becoming the shell.
Added the $$ (current PID) and $PPID (parent PPID) variables to the shell.