Kernel: Add argc and argv to process entry

userspace/cat/CMakeLists.txt

@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.26)
+
+project(cat CXX)
+
+set(SOURCES
+	main.cpp
+)
+
+add_executable(cat ${SOURCES})
+target_compile_options(cat PUBLIC -O2 -g)
+add_dependencies(cat libc-install)
+target_link_options(cat PUBLIC -nodefaultlibs -lc)
+
+add_custom_target(cat-install
+	COMMAND cp ${CMAKE_CURRENT_BINARY_DIR}/cat ${BANAN_BIN}/
+	DEPENDS cat
+)

userspace/cat/main.cpp

@@ -0,0 +1,50 @@
+#include <stdio.h>
+
+bool cat_file(FILE* fp)
+{
+	char buffer[1024];
+	size_t n_read;
+	while ((n_read = fread(buffer, 1, sizeof(buffer) - 1, fp)) > 0)
+	{
+		buffer[n_read] = '\0';
+		fputs(buffer, stdout);
+	}
+	if (ferror(fp))
+	{
+		perror("fread");
+		return false;
+	}
+	return true;
+}
+
+int main(int argc, char** argv)
+{
+	int ret = 0;
+
+	printf("argc %d, argv %p\n", argc, argv);
+	for (int i = 0; i < argc; i++)
+		printf("%s\n", argv[i]);
+
+	if (argc > 1)
+	{
+		for (int i = 1; i < argc; i++)
+		{
+			FILE* fp = fopen(argv[i], "r");
+			if (fp == nullptr)
+			{
+				perror(argv[i]);
+				ret = 1;
+				continue;
+			}
+			if (cat_file(fp))
+				ret = 1;
+			fclose(fp);
+		}
+	}
+	else
+	{
+		ret = cat_file(stdin);
+	}
+
+	return ret;
+}