Kernel/LibC/Userspace: Implement mkdir and creat

Touch now uses creat insteadd of open with O_CREAT flag

CMakeLists.txt

@@ -23,7 +23,7 @@ add_subdirectory(LibELF)
 add_subdirectory(userspace)
 
 add_custom_target(sysroot
-	COMMAND mkdir -p ${BANAN_SYSROOT}
+	COMMAND ${CMAKE_COMMAND} -E make_directory ${BANAN_SYSROOT}
 	COMMAND cd ${BANAN_SYSROOT} && sudo tar xf ${BANAN_BASE_SYSROOT}
 	USES_TERMINAL
 )

kernel/include/kernel/Process.h

@@ -96,6 +96,8 @@ namespace Kernel
 		BAN::ErrorOr<long> sys_close(int fd);
 		BAN::ErrorOr<long> sys_read(int fd, void* buffer, size_t count);
 		BAN::ErrorOr<long> sys_write(int fd, const void* buffer, size_t count);
+		BAN::ErrorOr<long> sys_create(const char*, mode_t);
+		BAN::ErrorOr<long> sys_create_dir(const char*, mode_t);
 
 		BAN::ErrorOr<long> sys_chmod(const char*, mode_t);
 

kernel/kernel/Process.cpp

@@ -746,6 +746,22 @@ namespace Kernel
 		return TRY(m_open_file_descriptors.write(fd, BAN::ByteSpan((uint8_t*)buffer, count)));
 	}
 
+	BAN::ErrorOr<long> Process::sys_create(const char* path, mode_t mode)
+	{
+		LockGuard _(m_lock);
+		validate_string_access(path);
+		TRY(create_file_or_dir(path, mode));
+		return 0;
+	}
+
+	BAN::ErrorOr<long> Process::sys_create_dir(const char* path, mode_t mode)
+	{
+		LockGuard _(m_lock);
+		validate_string_access(path);
+		TRY(create_file_or_dir(path, Inode::Mode::IFDIR | mode));
+		return 0;
+	}
+
 	BAN::ErrorOr<long> Process::sys_chmod(const char* path, mode_t mode)
 	{
 		if (mode & S_IFMASK)

kernel/kernel/Syscall.cpp

@@ -202,6 +202,12 @@ namespace Kernel
 		case SYS_CHMOD:
 			ret = Process::current().sys_chmod((const char*)arg1, (mode_t)arg2);
 			break;
+		case SYS_CREATE:
+			ret = Process::current().sys_create((const char*)arg1, (mode_t)arg2);
+			break;
+		case SYS_CREATE_DIR:
+			ret = Process::current().sys_create_dir((const char*)arg1, (mode_t)arg2);
+			break;
 		default:
 			dwarnln("Unknown syscall {}", syscall);
 			break;

libc/fcntl.cpp

@@ -4,6 +4,11 @@
 #include <sys/syscall.h>
 #include <unistd.h>
 
+int creat(const char* path, mode_t mode)
+{
+	return syscall(SYS_CREATE, path, S_IFREG | mode);
+}
+
 int open(const char* path, int oflag, ...)
 {
 	va_list args;

libc/include/sys/syscall.h

@@ -56,6 +56,8 @@ __BEGIN_DECLS
 #define SYS_TTY_CTRL 53
 #define SYS_POWEROFF 54
 #define SYS_CHMOD 55
+#define SYS_CREATE 56 // creat, mkfifo
+#define SYS_CREATE_DIR 57 // mkdir
 
 __END_DECLS
 

libc/sys/stat.cpp

@@ -28,3 +28,8 @@ int stat(const char* __restrict path, struct stat* __restrict buf)
 {
 	return syscall(SYS_STAT, path, buf, 0);
 }
+
+int mkdir(const char* path, mode_t mode)
+{
+	return syscall(SYS_CREATE_DIR, path, mode);
+}

userspace/CMakeLists.txt

@@ -13,6 +13,7 @@ set(USERSPACE_PROJECTS
 	init
 	ls
 	meminfo
+	mkdir
 	mmap-shared-test
 	poweroff
 	Shell

userspace/mkdir/CMakeLists.txt

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

userspace/mkdir/main.cpp

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <sys/stat.h>
+
+int main(int argc, char** argv)
+{
+	if (argc <= 1)
+	{
+		fprintf(stderr, "Missing operand\n");
+		return 1;
+	}
+
+	int ret = 0;
+	for (int i = 1; i < argc; i++)
+	{
+		if (mkdir(argv[i], 0755) == -1)
+		{
+			perror("mkdir");
+			ret = 1;
+		}
+	}
+
+	return ret;
+}

userspace/touch/main.cpp

@@ -4,18 +4,14 @@
 
 int main(int argc, char** argv)
 {
+	int ret = 0;
 	for (int i = 1; i < argc; i++)
 	{
-		int fd = open(argv[i], O_WRONLY | O_CREAT, 0644);
-		if (fd == -1)
+		if (creat(argv[i], 0644) == -1 && errno != EEXIST)
 		{
-			if (errno != EEXISTS)
 			perror(argv[i]);
-		}
-		else
-		{
-			close(fd);
+			ret = 1;
 		}
 	}
-	return 0;
+	return ret;
 }