feat(linux): add uptime

src/linux/linux.zig

@@ -1,4 +1,12 @@
 const std = @import("std");
+const c_sysinfo = @cImport(@cInclude("sys/sysinfo.h"));
+
+/// Structure representing system uptime in days, hours, and minutes.
+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 +21,35 @@ pub fn getHostname(allocator: std.mem.Allocator) ![]u8 {
 
     return hostname;
 }
+
+/// Returns the system uptime.
+///
+/// Uses `sysinfo` to fetch the system uptime and calculates the elapsed time.
+pub fn getSystemUptime() !SystemUptime {
+    const seconds_per_day: f64 = 86400.0;
+    const hours_per_day: f64 = 24.0;
+    const seconds_per_hour: f64 = 3600.0;
+    const seconds_per_minute: f64 = 60.0;
+
+    var info: c_sysinfo.struct_sysinfo = undefined;
+    if (c_sysinfo.sysinfo(&info) != 0) {
+        return error.SysinfoFailed;
+    }
+
+    const uptime_seconds: f64 = @as(f64, @floatFromInt(info.uptime));
+
+    var remainig_seconds: f64 = uptime_seconds;
+    const days: f64 = @floor(remainig_seconds / seconds_per_day);
+
+    remainig_seconds = (remainig_seconds / seconds_per_day) - days;
+    const hours = @floor(remainig_seconds * hours_per_day);
+
+    remainig_seconds = (remainig_seconds * hours_per_day) - hours;
+    const minutes = @floor((remainig_seconds * seconds_per_hour) / seconds_per_minute);
+
+    return SystemUptime{
+        .days = @as(i8, @intFromFloat(days)),
+        .hours = @as(i8, @intFromFloat(hours)),
+        .minutes = @as(i8, @intFromFloat(minutes)),
+    };
+}