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const std = @import("std");
const builtin = @import("builtin");
pub fn getKernelInfo(alloc: std.mem.Allocator) ?[]const u8 {
if (comptime builtin.os.tag != .linux) return null;
const path = "/proc/sys/kernel/osrelease";
var file = std.fs.openFileAbsolute(path, .{}) catch return null;
defer file.close();
// 128 bytes should be enough to hold the kernel information
const kernel_info = file.readToEndAlloc(alloc, 128) catch return null;
defer alloc.free(kernel_info);
return alloc.dupe(u8, std.mem.trim(u8, kernel_info, &std.ascii.whitespace)) catch return null;
}
test "read /proc/sys/kernel/osrelease" {
if (comptime builtin.os.tag != .linux) return null;
const allocator = std.testing.allocator;
const kernel_info = getKernelInfo(allocator).?;
defer allocator.free(kernel_info);
// Since we can't hardcode the info in tests, just check
// if something was read from the file
try std.testing.expect(kernel_info.len > 0);
try std.testing.expect(!std.mem.eql(u8, kernel_info, ""));
}
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