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target: Implement running OS version detection for FreeBSD (#5416) 

* target: Implement OS version detection for FreeBSD

Fixes #4582

* freebsd version: handle errors explicitly
master
Jethro Nederhof 2020-05-25 10:52:13 +10:00 committed by GitHub
parent 07472fb453
commit 4b1a846471
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1 changed files with 21 additions and 2 deletions
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23
lib/std/zig/system.zig
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@ -292,8 +292,27 @@ pub const NativeTargetInfo = struct {
}
},
.freebsd => {
// Unimplemented, fall back to default.
// https://github.com/ziglang/zig/issues/4582
var osreldate: u32 = undefined;
var len: usize = undefined;
std.os.sysctlbynameZ("kern.osreldate", &osreldate, &len, null, 0) catch |err| switch (err) {
error.NameTooLong => unreachable, // constant, known good value
error.PermissionDenied => unreachable, // only when setting values,
error.SystemResources => unreachable, // memory already on the stack
error.UnknownName => unreachable, // constant, known good value
error.Unexpected => unreachable, // EFAULT: stack should be safe, EISDIR/ENOTDIR: constant, known good value
};
// https://www.freebsd.org/doc/en_US.ISO8859-1/books/porters-handbook/versions.html
// Major * 100,000 has been convention since FreeBSD 2.2 (1997)
// Minor * 1(0),000 summed has been convention since FreeBSD 2.2 (1997)
// e.g. 492101 = 4.11-STABLE = 4.(9+2)
const major = osreldate / 100_000;
const minor1 = osreldate % 100_000 / 10_000; // usually 0 since 5.1
const minor2 = osreldate % 10_000 / 1_000; // 0 before 5.1, minor version since
const patch = osreldate % 1_000;
os.version_range.semver.min = .{ .major = major, .minor = minor1 + minor2, .patch = patch };
os.version_range.semver.max = .{ .major = major, .minor = minor1 + minor2, .patch = patch };
},
else => {
// Unimplemented, fall back to default version range.