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Sohaib Mohamed 6f2021f3d9 PCP: support for 'dynamic columns' added at runtime 
Implements support for arbitrary Performance Co-Pilot
metrics with per-process instance domains to form new
htop columns.  The column-to-metric mappings are setup
using configuration files which will be documented via
man pages as part of a follow-up commit.

We provide an initial set of column configurations so
as to provide new capabilities to pcp-htop: including
configs for containers, open fd counts, scheduler run
queue time, tcp/udp bytes/calls sent/recv, delay acct,
virtual machine guests, detailed virtual memory, swap.

Note there is a change to the configuration file path
resolution algorithm introduced for 'dynamic meters'.
First, look in any custom PCP_HTOP_DIR location.  Then
iterate, in priority order, users home directory, then
local sysadmins files in /etc/pcp/htop, then readonly
configuration files below /usr/share/pcp/htop.  This
final location becomes the preferred place for our own
shipped meter and column files.

The Settings file (htoprc) writing code is updated to
not using the numeric identifier for dynamic columns.
The same strategy used for dynamic meters is used here
where we write Dynamic(name) so the name can be setup
once more at start.  Regular (static) columns writing
to htoprc - i.e. numerically indexed - is unchanged.
 		2021-08-13 07:32:57 +02:00
..
NetBSDProcess.c Adds support for PROC_EXE and CWD. 2021-06-26 12:18:37 +02:00
NetBSDProcess.h Implements the NetBSD specific changes for makeCommandStr refactor. 2021-06-26 12:18:37 +02:00
NetBSDProcessList.c Fix indentation style 2021-07-21 21:06:58 +02:00
NetBSDProcessList.h netbsd: Support display of CPU frequency 2021-07-21 21:06:58 +02:00
Platform.c netbsd: Support display of CPU frequency 2021-07-21 21:06:58 +02:00
Platform.h PCP: support for 'dynamic columns' added at runtime 2021-08-13 07:32:57 +02:00
ProcessField.h Update copyright notices 2021-06-26 12:18:37 +02:00
README.md netbsd: update README.md (#694) 2021-07-15 06:41:42 +02:00

README.md

NetBSD support in htop(1)

This implementation utilizes kvm_getprocs(3), sysctl(3), etc, eliminating the need for mount_procfs(8) with Linux compatibility enabled.

The implementation was initially based on the OpenBSD support in htop(1).

Notes on NetBSD curses

NetBSD is one of the last operating systems to use and maintain its own implementation of Curses.

htop(1) can be compiled against either ncurses or NetBSD's curses(3). In order for NetBSD's libcurses to be used, htop(1) must be configured with --disable-unicode. This is necessary because htop(1) with Unicode enabled directly accesses ncurses's cchar_t struct, which has different contents in NetBSD's curses.

Versions of libcurses in NetBSD 9 and prior have no mouse support (this is an ncurses extension). Newer versions contain no-op mouse functions for compatibility with ncurses.

What needs improvement

  • Kernel and userspace threads are not displayed or counted - maybe look at NetBSD top(1).
  • Battery display - use envsys(4).
  • Support for compiling using libcurses's Unicode support.
  • Support for fstat(1) (view open files, like lsof(8) on Linux).
  • Support for ktrace(1) (like strace(1) on Linux).