From 2441f208c64f61b83bf4cc60b5258be3dff3614e Mon Sep 17 00:00:00 2001
From: Bananymous <bananymousosq@gmail.com>
Date: Tue, 15 Aug 2023 09:03:51 +0300
Subject: [PATCH] Userspace: Add basic whoami command

---
 userspace/CMakeLists.txt        |  1 +
 userspace/whoami/CMakeLists.txt | 16 ++++++++++++++++
 userspace/whoami/main.cpp       | 16 ++++++++++++++++
 3 files changed, 33 insertions(+)
 create mode 100644 userspace/whoami/CMakeLists.txt
 create mode 100644 userspace/whoami/main.cpp

diff --git a/userspace/CMakeLists.txt b/userspace/CMakeLists.txt
index 7acbbd81..df446667 100644
--- a/userspace/CMakeLists.txt
+++ b/userspace/CMakeLists.txt
@@ -14,6 +14,7 @@ set(USERSPACE_PROJECTS
 	test
 	touch
 	u8sum
+	whoami
 	yes
 )
 
diff --git a/userspace/whoami/CMakeLists.txt b/userspace/whoami/CMakeLists.txt
new file mode 100644
index 00000000..392d1c3a
--- /dev/null
+++ b/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
+)
diff --git a/userspace/whoami/main.cpp b/userspace/whoami/main.cpp
new file mode 100644
index 00000000..a042c569
--- /dev/null
+++ b/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;
+}