Userspace: Add basic whoami command

userspace/CMakeLists.txt

@@ -14,6 +14,7 @@ set(USERSPACE_PROJECTS
 	test
 	touch
 	u8sum
+	whoami
 	yes
 )
 

userspace/whoami/CMakeLists.txt

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

userspace/whoami/main.cpp

@@ -0,0 +1,16 @@
+#include <pwd.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main()
+{
+	auto* pw = getpwuid(geteuid());
+	if (pw == nullptr)
+	{
+		printf("unknown user %d\n", geteuid());
+		return 1;
+	}
+	printf("%s\n", pw->pw_name);
+	endpwent();
+	return 0;
+}