It uses pledge and unveil for OpenBSD version 6.4 and later.

It determines and prints the fastest OpenBSD mirror for your version and architecture for the /etc/installurl file and if run as root, will write it to disk unless the -f flag is used. Compiler optimization for speed is not necessary as the calls using ftp will take up the vast majority of the run-time. pledge() is updated throughout, while because of how unveil() is designed, creates all of the unveil() limits up front and immediately takes away the possibility to unveil() any further.

It automatically discovers whether you are running a release vs a current or beta snapshot!

This program should work on OpenBSD versions 6.4+ (Up to 6.6 as of this writing) and won't compile for earlier versions.

It uses several commandline options:

-f prohibits a fork()ed process from writing the fastest mirror to file even if it has the power to do so as root.

-h will print the "help" options.

-O will override and search for release mirrors if it a snapshot. It will search for snapshot mirrors if it is a release.

-s will accept floating-point timeout like 1.5 seconds using strtod() and handrolled validation, eg. "-s 1.5", default 5.

-S (“Secure only”) option will only choose https mirrors. Otherwise, http and ftp mirrors will be chosen. The ftp mirrors are turned into http mirror listings and deduplicated. http/ftp mirrors are faster than most https mirror selections, however they pass over the internet without encryption. Integrity is still preserved by not using -S, but it will not provide secrecy.

-u will make it search for only non-USA mirrors for export encryption compliance if you are searching from outside of the USA.

-v will show when it is fetching "https://www.openbsd.org/ftp.html", print out the results sorted in reverse order by time or if timed out, or download error, alphabetically and print a line that you can copy and paste into a root terminal to install that mirror. A second 'v' will make it print out the information of the mirrors in real time, as well. A third ‘v’ will show verboseness in the ftp calls to mirrors.

-V will stop all output except error messages. It overrides all -v instances.

It will shorten the timeout period to the download time of the fastest mirror throughout execution if no -v are used.

cc pkg_ping.c -o pkg_ping

eg. ./pkg_ping -vs1.5 -vvu

eg. ./pkg_ping -vSvs 2