whoami: Use pledge() and unveil()

Author: https://github.com/awesomekling
Commit: 4f7081289c

Userland/whoami.cpp

@@ -29,6 +29,18 @@
 
 int main(int, char**)
 {
+    if (pledge("stdio rpath", nullptr) < 0) {
+        perror("pledge");
+        return 1;
+    }
+
+    if (unveil("/etc/passwd", "r") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    unveil(nullptr, nullptr);
+
     puts(getlogin());
     return 0;
 }