C++ (Cpp) create_file_fsの例

コード例 #1

ファイル: syscall.c プロジェクト: Munix-Project/munix

static int sys_open(const char * file, int flags, int mode) {
    PTR_VALIDATE(file);
    debug_print(NOTICE, "open(%s) flags=0x%x; mode=0x%x", file, flags, mode);
    fs_node_t * node = kopen((char *)file, flags);
    if (!node && (flags & O_CREAT)) {
        debug_print(NOTICE, "- file does not exist and create was requested.");
        /* Um, make one */
        if (!create_file_fs((char *)file, mode)) {
            node = kopen((char *)file, flags);
        }
    }
    if (!node) {
        debug_print(NOTICE, "File does not exist; someone should be setting errno?");
        return -1;
    }
    node->offset = 0;
    int fd = process_append_fd((process_t *)current_process, node);
    debug_print(INFO, "[open] pid=%d %s -> %d", getpid(), file, fd);
    return fd;
}

コード例 #2

ファイル: syscall.c プロジェクト: klange/ponyos

static int sys_open(const char * file, int flags, int mode) {
	PTR_VALIDATE(file);
	debug_print(NOTICE, "open(%s) flags=0x%x; mode=0x%x", file, flags, mode);
	fs_node_t * node = kopen((char *)file, flags);

	if (node && !has_permission(node, 04)) {
		debug_print(WARNING, "access denied (read, sys_open, file=%s)", file);
		return -EACCES;
	}
	if (node && ((flags & O_RDWR) || (flags & O_APPEND) || (flags & O_WRONLY))) {
		if (!has_permission(node, 02)) {
			debug_print(WARNING, "access denied (write, sys_open, file=%s)", file);
			return -EACCES;
		}
	}

	if (!node && (flags & O_CREAT)) {
		/* TODO check directory permissions */
		debug_print(NOTICE, "- file does not exist and create was requested.");
		/* Um, make one */
		int result = create_file_fs((char *)file, mode);
		if (!result) {
			node = kopen((char *)file, flags);
		} else {
			return result;
		}
	}
	if (!node) {
		debug_print(NOTICE, "File does not exist; someone should be setting errno?");
		return -1;
	}
	node->offset = 0;
	int fd = process_append_fd((process_t *)current_process, node);
	debug_print(INFO, "[open] pid=%d %s -> %d", getpid(), file, fd);
	return fd;
}

コード例 #3

ファイル: syscall.c プロジェクト: klange/toaruos

static int sys_open(const char * file, int flags, int mode) {
	PTR_VALIDATE(file);
	debug_print(NOTICE, "open(%s) flags=0x%x; mode=0x%x", file, flags, mode);
	fs_node_t * node = kopen((char *)file, flags);

	int access_bits = 0;

	if (node && (flags & O_CREAT) && (flags & O_EXCL)) {
		close_fs(node);
		return -EEXIST;
	}

	if (!(flags & O_WRONLY) || (flags & O_RDWR)) {
		if (node && !has_permission(node, 04)) {
			debug_print(WARNING, "access denied (read, sys_open, file=%s)", file);
			close_fs(node);
			return -EACCES;
		} else {
			access_bits |= 01;
		}
	}

	if ((flags & O_RDWR) || (flags & O_WRONLY)) {
		if (node && !has_permission(node, 02)) {
			close_fs(node);
			return -EACCES;
		}
		if (node && (node->flags & FS_DIRECTORY)) {
			return -EISDIR;
		}
		if ((flags & O_RDWR) || (flags & O_WRONLY)) {
			/* truncate doesn't grant write permissions */
			access_bits |= 02;
		}
	}

	if (!node && (flags & O_CREAT)) {
		/* TODO check directory permissions */
		debug_print(NOTICE, "- file does not exist and create was requested.");
		/* Um, make one */
		int result = create_file_fs((char *)file, mode);
		if (!result) {
			node = kopen((char *)file, flags);
		} else {
			return result;
		}
	}

	if (node && (flags & O_DIRECTORY)) {
		if (!(node->flags & FS_DIRECTORY)) {
			return -ENOTDIR;
		}
	}

	if (node && (flags & O_TRUNC)) {
		if (!(access_bits & 02)) {
			close_fs(node);
			return -EINVAL;
		}
		truncate_fs(node);
	}

	if (!node) {
		return -ENOENT;
	}
	if (node && (flags & O_CREAT) && (node->flags & FS_DIRECTORY)) {
		close_fs(node);
		return -EISDIR;
	}
	int fd = process_append_fd((process_t *)current_process, node);
	FD_MODE(fd) = access_bits;
	if (flags & O_APPEND) {
		FD_OFFSET(fd) = node->length;
	} else {
		FD_OFFSET(fd) = 0;
	}
	debug_print(INFO, "[open] pid=%d %s -> %d", getpid(), file, fd);
	return fd;
}