feat(macos): add uptime

src/macos/macos.zig

@@ -1,4 +1,12 @@
 const std = @import("std");
+const c_libproc = @cImport(@cInclude("libproc.h"));
+const c_sysctl = @cImport(@cInclude("sys/sysctl.h"));
+
+pub const SystemUptime = struct {
+    days: i8,
+    hours: i8,
+    minutes: i8,
+};
 
 pub fn getUsername(allocator: std.mem.Allocator) ![]u8 {
     const username = try std.process.getEnvVarOwned(allocator, "USER");
@@ -13,3 +21,36 @@ pub fn getHostname(allocator: std.mem.Allocator) ![]u8 {
 
     return hostname;
 }
+
+pub fn getSystemUptime() !SystemUptime {
+    const seconds_per_day: f64 = 86400.0;
+
+    var boot_time: c_libproc.struct_timeval = undefined;
+    var size: usize = @sizeOf(c_libproc.struct_timeval);
+
+    var uptime_ns: f64 = 0.0;
+
+    var name = [_]c_int{ c_sysctl.CTL_KERN, c_sysctl.KERN_BOOTTIME };
+    if (c_sysctl.sysctl(&name, 2, &boot_time, &size, null, 0) == 0) {
+        const boot_seconds = @as(f64, @floatFromInt(boot_time.tv_sec));
+        const now_seconds = @as(f64, @floatFromInt(std.time.timestamp()));
+        uptime_ns = now_seconds - boot_seconds;
+    } else {
+        return error.UnableToGetSystemUptime;
+    }
+
+    var remainig_seconds: f64 = uptime_ns;
+    const days: f64 = @floor(remainig_seconds / seconds_per_day);
+
+    remainig_seconds = (remainig_seconds / seconds_per_day) - days;
+    const hours = @floor(remainig_seconds * 24);
+
+    remainig_seconds = (remainig_seconds * 24) - hours;
+    const minutes = @floor((remainig_seconds * 3600) / 60);
+
+    return SystemUptime{
+        .days = @as(i8, @intFromFloat(days)),
+        .hours = @as(i8, @intFromFloat(hours)),
+        .minutes = @as(i8, @intFromFloat(minutes)),
+    };
+}