Add uname

Author: godsarmy

README.md

@@ -18,10 +18,11 @@ namespace [std.os.linux](https://ziglang.org/documentation/master/std/#std.os.li
 | [pipe.zig](src/pipe.zig)                   | [pipe](https://ziglang.org/documentation/master/std/#std.os.linux.pipe) [read](https://ziglang.org/documentation/master/std/#std.os.linux.read) [write](https://ziglang.org/documentation/master/std/#std.os.linux.write) |
 | [symlink.zig](src/symlink.zig)             | [symlink](https://ziglang.org/documentation/master/std/#std.os.linux.symlink) [readlink](https://ziglang.org/documentation/master/std/#std.os.linux.readlink) |
 | [ushare.zig](src/ushare.zig)               | [getuid](https://ziglang.org/documentation/master/std/#std.os.linux.getuid) [unshare](https://ziglang.org/documentation/master/std/#std.os.linux.unshare) |
+| [uname.zig](src/uname.zig)                 | [uname](https://ziglang.org/documentation/master/std/#std.os.linux.uname) |
 
 ## Usage
  * Install [zig >= 0.13](https://ziglang.org/download/)
- * Build Only
+ * Build Only. You will have binaries in `zig-out/bin`.
 ```sh
 zig build
 ```

src/uname.zig

@@ -0,0 +1,21 @@
+const std = @import("std");
+
+const mem = std.mem;
+const meta = std.meta;
+const stdout = std.io.getStdOut().writer();
+const linux = std.os.linux;
+
+pub fn main() !void {
+    // demostrate to get a complex struct by linux call
+
+    var uts: linux.utsname = undefined;
+
+    const rc = linux.uname(&uts);
+    try stdout.print("rc of uname is {d}\n", .{rc});
+    try stdout.print("uts[{}] printed in raw mode {}\n", .{ @TypeOf(uts), uts });
+
+    // iterate over fields of struct
+    inline for (meta.fields(@TypeOf(uts))) |f| {
+        try stdout.print("{s}: {s}\n", .{ f.name, @as(f.type, @field(uts, f.name)) });
+    }
+}