Reimplementing `sysmgr` in C
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For a while, I have been thinking about implementing [sysmgr] in C. I started
thinking about the inefficiencies of sysmgr. POSIX sh isn't particularly
designed to have ultimate control over child processes. There are basic job
management features that are _just enough_ for sysmgr to do its job. The
biggest pain is having to use tools like `sleep(1)` and `kill(1)`. Calling
sleep every second, and using the kill command to check whether a process is
alive or not is extremely inefficient. Some shells _do_ include these commands
built-in, but it isn't specified by POSIX, but one should never take this as
granted.

Lately, I have been adding C utilities to sysmgr to make it more efficient. This
defeats the initial purpose of sysmgr, being a service manager in pure POSIX
shell. My main purpose, however, is making sysmgr efficient and simplistic. It
mostly imitates `runit` without dealing with all the complexity of the
over-thinked `supervise` directory, nor the logging stuff. Most of these can be
handled by the service script itself anyway. That's why instead of this ugly
C/POSIX sh hybrid, I decided to implement it all in C.

I am not a C expert or anything, I am learning a lot as I am writing the
program. I want it to be C99 and portable (for BSD). It's currently not
functional at all, but, you can see its current state [here].

[sysmgr]: https://git.ckyln.com/sysmgr
[here]:   https://git.ckyln.com/sm

EDIT Oct 10 2020:

I did the initial release of this C version of sysmgr, which is more stable,
and performant than the POSIX sh version. It still has rough edges, but is
completely usable.