/* Copyright (c) 2012 The Chromium Authors. All rights reserved. * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #ifndef LIBRARIES_NACL_IO_NACL_IO_H_ #define LIBRARIES_NACL_IO_NACL_IO_H_ #include <ppapi/c/pp_instance.h> #include <ppapi/c/ppb.h> #include "sdk_util/macros.h" EXTERN_C_BEGIN typedef void (*nacl_io_exit_handler_t)(int status, void* user_data); /** * Initialize nacl_io. * * NOTE: If you initialize nacl_io with this constructor, you cannot * use any filesystems that require PPAPI; e.g. persistent storage, etc. */ void nacl_io_init(); /** * Initialize nacl_io with PPAPI support. * * Usage: * PP_Instance instance; * PPB_GetInterface get_interface; * nacl_io_init(instance, get_interface); * * If you are using the PPAPI C interface: * |instance| is passed to your instance in the DidCreate function. * |get_interface| is passed to your module in the PPP_InitializeModule * function. * * If you are using the PPAPI C++ interface: * |instance| can be retrieved via the pp::Instance::pp_instance() method. * |get_interface| can be retrieved via * pp::Module::Get()->get_browser_interface() */ void nacl_io_init_ppapi(PP_Instance instance, PPB_GetInterface get_interface); int nacl_io_register_exit_handler(nacl_io_exit_handler_t exit_handler, void* user_data); /** * Mount a new filesystem type. * * This function is declared in <sys/mount.h>, but we document it here * because nacl_io is controlled primarily through mount(2)/umount(2). * * Some parameters are dependent on the filesystem type being mounted. * * The |data| parameter, if used, is always parsed as a string of comma * separated key-value pairs: * e.g. "key1=param1,key2=param2" * * * filesystem types: * "memfs": An in-memory filesystem. * source: Unused. * data: Unused. * * "dev": A filesystem with various utility nodes. Some examples: * "null": equivalent to /dev/null. * "zero": equivalent to /dev/zero. * "urandom": equivalent to /dev/urandom. * "console[0-3]": logs to the JavaScript console with varying log * levels. * "tty": Posts a message to JavaScript, which will send a "message" * event from this module's embed element. * source: Unused. * data: Unused. * * "html5fs": A filesystem that uses PPAPI FileSystem interface, which can be * read in JavaScript via the HTML5 FileSystem API. This filesystem * provides the use of persistent storage. Please read the * documentation in ppapi/c/ppb_file_system.h for more information. * source: Unused. * data: A string of parameters: * "type": Which type of filesystem to mount. Valid values are * "PERSISTENT" and "TEMPORARY". The default is "PERSISTENT". * "expected_size": The expected file-system size. Note that this does * not request quota -- you must do that from JavaScript. * * "httpfs": A filesystem that reads from a URL via HTTP. * source: The root URL to read from. All paths read from this filesystem * will be appended to this root. * e.g. If source == "http://example.com/path", reading from * "foo/bar.txt" will attempt to read from the URL * "http://example.com/path/foo/bar.txt". * data: A string of parameters: * "allow_cross_origin_requests": If "true", then reads from this * filesystem will follow the CORS standard for cross-origin requests. * See http://www.w3.org/TR/access-control. * "allow_credentials": If "true", credentials are sent with cross-origin * requests. If false, no credentials are sent with the request and * cookies are ignored in the response. * All other key/value pairs are assumed to be headers to use with * HTTP requests. * * "passthroughfs": A filesystem that passes all requests through to the * underlying NaCl calls. The primary use of this filesystem * is to allow reading NMF resources. * source: Unused. * data: Unused. * * * @param[in] source Depends on the filesystem type. See above. * @param[in] target The absolute path to mount the filesystem. * @param[in] filesystemtype The name of the filesystem type to mount. See * above for examples. * @param[in] mountflags Unused. * @param[in] data Depends on the filesystem type. See above. * @return 0 on success, -1 on failure (with errno set). * * int mount(const char* source, const char* target, const char* filesystemtype, * unsigned long mountflags, const void *data) NOTHROW; */ /** * Register a new filesystem type, using a FUSE interface to implement it. * * Example: * int my_open(const char* path, struct fuse_file_info*) { * ... * } * * int my_read(const char* path, char* buf, size_t count, off_t offset, struct * fuse_file_info* info) { * ... * } * * struct fuse_operations my_fuse_ops = { * ... * my_open, * NULL, // opendir() not implemented. * my_read, * ... * }; * * ... * * const char fs_type[] = "my_fs"; * int result = nacl_io_register_fs_type(fs_type, &my_fuse_ops); * if (!result) { * fprintf(stderr, "Error registering filesystem type %s.\n", fs_type); * exit(1); * } * * ... * * int result = mount("", "/fs/foo", fs_type, 0, NULL); * if (!result) { * fprintf(stderr, "Error mounting %s.\n", fs_type); * exit(1); * } * * See fuse.h for more information about the FUSE interface. * Also see fuse.sourceforge.net for more information about FUSE in general. * * @param[in] fs_type The name of the new filesystem type. * @param[in] fuse_ops A pointer to the FUSE interface that will be used to * implement this filesystem type. This pointer must be valid for the * lifetime of all filesystems and nodes that are created with it. * @return 0 on success, -1 on failure (with errno set). */ struct fuse_operations; int nacl_io_register_fs_type(const char* fs_type, struct fuse_operations* fuse_ops); /** * Unregister a filesystem type, previously registered by * nacl_io_register_fs_type(). * * @param[in] fs_type The name of the filesystem type; the same identifier that * was passed to nacl_io_register_fs_type(). * @return 0 on success, -1 on failure (with errno set). */ int nacl_io_unregister_fs_type(const char* fs_type); EXTERN_C_END #endif /* LIBRARIES_NACL_IO_NACL_IO_H_ */