Userspace: Add test for popen

userspace/CMakeLists.txt

@@ -34,6 +34,7 @@ set(USERSPACE_PROJECTS
 	test-framebuffer
 	test-globals
 	test-mouse
+	test-popen
 	test-sort
 	test-tcp
 	test-udp

userspace/test-popen/CMakeLists.txt

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

userspace/test-popen/main.cpp

@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <unistd.h>
+
+int main(int argc, char** argv)
+{
+	if (argc != 2)
+	{
+		fprintf(stderr, "usage: %s COMMAND\n", argv[0]);
+		return 1;
+	}
+
+	FILE* fp = popen(argv[1], "r");
+	if (fp == nullptr)
+	{
+		perror("popen");
+		return 1;
+	}
+
+	char buffer[128];
+	while (fgets(buffer, sizeof(buffer), fp) != NULL)
+		printf("%s", buffer);
+
+	if (pclose(fp) == -1)
+	{
+		perror("pclose");
+		return 1;
+	}
+
+	return 0;
+}