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So yes, I don't think I have ever typed out "fileDescriptor" but I do label these things to make it more legible!
OP has a point. We could do with more discipline when it comes to naming conventions in C. We're not using punch cards any longer.
Somewhat related, there's another comment about the 80 char max... clang-format keeps to this. I'm kind of OK with this particular remnant of punch cards because I can get four editor windows open side by side on my ultra wide monitor.
The nginx codebase is pretty freaking fantastic and I've learned a lot from just randomly browsing through the source, but I mean, come on:
https://github.com/nginx/nginx/blob/master/src/core/ngx_arra...
if ((u_char *) a->elts + a->size * a->nalloc == p->d.last) {
/proc is amazing once you get the hang of it and get a good understanding of what's all in there. Especially if you're doing low level performance tuning.
It's particularly helpful in larger infrastructures where tool the variability means differences in available tooling, and their output plus cli options. I'm sure /proc iteration has its own issues of variability across large infrastructres, but I haven't seen it. It's a fairly consistent API. Or at least it was, since I haven't touched a large infrastructure in some time.
When I got tired of `lsof` not being installed on hosts (or when its `-i` param isn't available) I ended up writing a script [1] that just iterates through /proc over ssh and grabs all inet sockets, environment variables, command line, etc from a set of hosts. Results in a null-delimited output that can then be fed into something like grafana to create network maps. Biggest problem with it is the use of pipes means all cores go to 100% for the few seconds it takes to run.
[1] https://github.com/red-bin/lsofer