Userspace: Add basic id that prints {,e}{uid,gid} of the current proc

userspace/CMakeLists.txt

@@ -5,6 +5,7 @@ project(userspace CXX)
 set(USERSPACE_PROJECTS
 	cat
 	echo
+	id
 	init
 	ls
 	Shell

userspace/id/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.26)
+
+project(id CXX)
+
+set(SOURCES
+	main.cpp
+)
+
+add_executable(id ${SOURCES})
+target_compile_options(id PUBLIC -O2 -g)
+target_link_libraries(id PUBLIC libc)
+
+add_custom_target(id-install
+	COMMAND cp ${CMAKE_CURRENT_BINARY_DIR}/id ${BANAN_BIN}/
+	DEPENDS id
+)

userspace/id/main.cpp

@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include <unistd.h>
+
+int main()
+{
+	printf("uid %u, gid %u, euid %u, egid %u\n", getuid(), getgid(), geteuid(), getegid());
+}