350 lines
14 KiB
C
350 lines
14 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef __ESP_VFS_H__
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#define __ESP_VFS_H__
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#include <stdint.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/semphr.h"
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#include "esp_err.h"
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#include <sys/types.h>
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#include <sys/reent.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <dirent.h>
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#include <string.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef _SYS_TYPES_FD_SET
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#error "VFS should be used with FD_SETSIZE and FD_SET from sys/types.h"
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#endif
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/**
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* Maximum number of (global) file descriptors.
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*/
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#define MAX_FDS FD_SETSIZE /* for compatibility with fd_set and select() */
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/**
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* Maximum length of path prefix (not including zero terminator)
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*/
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#define ESP_VFS_PATH_MAX 15
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/**
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* Default value of flags member in esp_vfs_t structure.
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*/
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#define ESP_VFS_FLAG_DEFAULT 0
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/**
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* Flag which indicates that FS needs extra context pointer in syscalls.
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*/
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#define ESP_VFS_FLAG_CONTEXT_PTR 1
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/*
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* @brief VFS identificator used for esp_vfs_register_with_id()
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*/
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typedef int esp_vfs_id_t;
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/**
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* @brief VFS definition structure
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*
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* This structure should be filled with pointers to corresponding
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* FS driver functions.
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*
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* VFS component will translate all FDs so that the filesystem implementation
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* sees them starting at zero. The caller sees a global FD which is prefixed
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* with an pre-filesystem-implementation.
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*
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* Some FS implementations expect some state (e.g. pointer to some structure)
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* to be passed in as a first argument. For these implementations,
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* populate the members of this structure which have _p suffix, set
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* flags member to ESP_VFS_FLAG_CONTEXT_PTR and provide the context pointer
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* to esp_vfs_register function.
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* If the implementation doesn't use this extra argument, populate the
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* members without _p suffix and set flags member to ESP_VFS_FLAG_DEFAULT.
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*
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* If the FS driver doesn't provide some of the functions, set corresponding
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* members to NULL.
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*/
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typedef struct
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{
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int flags; /*!< ESP_VFS_FLAG_CONTEXT_PTR or ESP_VFS_FLAG_DEFAULT */
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union {
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ssize_t (*write_p)(void* p, int fd, const void * data, size_t size);
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ssize_t (*write)(int fd, const void * data, size_t size);
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};
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union {
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off_t (*lseek_p)(void* p, int fd, off_t size, int mode);
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off_t (*lseek)(int fd, off_t size, int mode);
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};
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union {
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ssize_t (*read_p)(void* ctx, int fd, void * dst, size_t size);
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ssize_t (*read)(int fd, void * dst, size_t size);
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};
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union {
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int (*open_p)(void* ctx, const char * path, int flags, int mode);
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int (*open)(const char * path, int flags, int mode);
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};
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union {
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int (*close_p)(void* ctx, int fd);
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int (*close)(int fd);
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};
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union {
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int (*fstat_p)(void* ctx, int fd, struct stat * st);
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int (*fstat)(int fd, struct stat * st);
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};
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union {
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int (*stat_p)(void* ctx, const char * path, struct stat * st);
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int (*stat)(const char * path, struct stat * st);
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};
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union {
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int (*link_p)(void* ctx, const char* n1, const char* n2);
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int (*link)(const char* n1, const char* n2);
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};
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union {
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int (*unlink_p)(void* ctx, const char *path);
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int (*unlink)(const char *path);
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};
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union {
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int (*rename_p)(void* ctx, const char *src, const char *dst);
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int (*rename)(const char *src, const char *dst);
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};
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union {
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DIR* (*opendir_p)(void* ctx, const char* name);
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DIR* (*opendir)(const char* name);
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};
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union {
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struct dirent* (*readdir_p)(void* ctx, DIR* pdir);
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struct dirent* (*readdir)(DIR* pdir);
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};
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union {
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int (*readdir_r_p)(void* ctx, DIR* pdir, struct dirent* entry, struct dirent** out_dirent);
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int (*readdir_r)(DIR* pdir, struct dirent* entry, struct dirent** out_dirent);
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};
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union {
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long (*telldir_p)(void* ctx, DIR* pdir);
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long (*telldir)(DIR* pdir);
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};
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union {
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void (*seekdir_p)(void* ctx, DIR* pdir, long offset);
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void (*seekdir)(DIR* pdir, long offset);
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};
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union {
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int (*closedir_p)(void* ctx, DIR* pdir);
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int (*closedir)(DIR* pdir);
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};
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union {
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int (*mkdir_p)(void* ctx, const char* name, mode_t mode);
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int (*mkdir)(const char* name, mode_t mode);
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};
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union {
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int (*rmdir_p)(void* ctx, const char* name);
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int (*rmdir)(const char* name);
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};
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union {
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int (*fcntl_p)(void* ctx, int fd, int cmd, va_list args);
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int (*fcntl)(int fd, int cmd, va_list args);
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};
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union {
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int (*ioctl_p)(void* ctx, int fd, int cmd, va_list args);
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int (*ioctl)(int fd, int cmd, va_list args);
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};
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union {
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int (*fsync_p)(void* ctx, int fd);
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int (*fsync)(int fd);
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};
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union {
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int (*access_p)(void* ctx, const char *path, int amode);
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int (*access)(const char *path, int amode);
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};
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/** start_select is called for setting up synchronous I/O multiplexing of the desired file descriptors in the given VFS */
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esp_err_t (*start_select)(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, SemaphoreHandle_t *signal_sem);
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/** socket select function for socket FDs with the functionality of POSIX select(); this should be set only for the socket VFS */
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int (*socket_select)(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *timeout);
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/** called by VFS to interrupt the socket_select call when select is activated from a non-socket VFS driver; set only for the socket driver */
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void (*stop_socket_select)();
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/** stop_socket_select which can be called from ISR; set only for the socket driver */
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void (*stop_socket_select_isr)(BaseType_t *woken);
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/** end_select is called to stop the I/O multiplexing and deinitialize the environment created by start_select for the given VFS */
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void (*end_select)();
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} esp_vfs_t;
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/**
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* Register a virtual filesystem for given path prefix.
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*
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* @param base_path file path prefix associated with the filesystem.
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* Must be a zero-terminated C string, up to ESP_VFS_PATH_MAX
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* characters long, and at least 2 characters long.
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* Name must start with a "/" and must not end with "/".
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* For example, "/data" or "/dev/spi" are valid.
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* These VFSes would then be called to handle file paths such as
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* "/data/myfile.txt" or "/dev/spi/0".
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* @param vfs Pointer to esp_vfs_t, a structure which maps syscalls to
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* the filesystem driver functions. VFS component doesn't
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* assume ownership of this pointer.
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* @param ctx If vfs->flags has ESP_VFS_FLAG_CONTEXT_PTR set, a pointer
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* which should be passed to VFS functions. Otherwise, NULL.
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*
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* @return ESP_OK if successful, ESP_ERR_NO_MEM if too many VFSes are
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* registered.
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*/
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esp_err_t esp_vfs_register(const char* base_path, const esp_vfs_t* vfs, void* ctx);
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/**
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* Special case function for registering a VFS that uses a method other than
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* open() to open new file descriptors from the interval <min_fd; max_fd).
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*
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* This is a special-purpose function intended for registering LWIP sockets to VFS.
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*
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* @param vfs Pointer to esp_vfs_t. Meaning is the same as for esp_vfs_register().
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* @param ctx Pointer to context structure. Meaning is the same as for esp_vfs_register().
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* @param min_fd The smallest file descriptor this VFS will use.
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* @param max_fd Upper boundary for file descriptors this VFS will use (the biggest file descriptor plus one).
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*
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* @return ESP_OK if successful, ESP_ERR_NO_MEM if too many VFSes are
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* registered, ESP_ERR_INVALID_ARG if the file descriptor boundaries
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* are incorrect.
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*/
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esp_err_t esp_vfs_register_fd_range(const esp_vfs_t *vfs, void *ctx, int min_fd, int max_fd);
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/**
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* Special case function for registering a VFS that uses a method other than
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* open() to open new file descriptors. In comparison with
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* esp_vfs_register_fd_range, this function doesn't pre-registers an interval
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* of file descriptors. File descriptors can be registered later, by using
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* esp_vfs_register_fd.
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*
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* @param vfs Pointer to esp_vfs_t. Meaning is the same as for esp_vfs_register().
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* @param ctx Pointer to context structure. Meaning is the same as for esp_vfs_register().
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* @param vfs_id Here will be written the VFS ID which can be passed to
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* esp_vfs_register_fd for registering file descriptors.
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*
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* @return ESP_OK if successful, ESP_ERR_NO_MEM if too many VFSes are
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* registered, ESP_ERR_INVALID_ARG if the file descriptor boundaries
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* are incorrect.
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*/
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esp_err_t esp_vfs_register_with_id(const esp_vfs_t *vfs, void *ctx, esp_vfs_id_t *vfs_id);
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/**
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* Unregister a virtual filesystem for given path prefix
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*
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* @param base_path file prefix previously used in esp_vfs_register call
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* @return ESP_OK if successful, ESP_ERR_INVALID_STATE if VFS for given prefix
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* hasn't been registered
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*/
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esp_err_t esp_vfs_unregister(const char* base_path);
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/**
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* Special function for registering another file descriptor for a VFS registered
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* by esp_vfs_register_with_id.
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*
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* @param vfs_id VFS identificator returned by esp_vfs_register_with_id.
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* @param fd The registered file descriptor will be written to this address.
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*
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* @return ESP_OK if the registration is successful,
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* ESP_ERR_NO_MEM if too many file descriptors are registered,
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* ESP_ERR_INVALID_ARG if the arguments are incorrect.
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*/
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esp_err_t esp_vfs_register_fd(esp_vfs_id_t vfs_id, int *fd);
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/**
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* Special function for unregistering a file descriptor belonging to a VFS
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* registered by esp_vfs_register_with_id.
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*
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* @param vfs_id VFS identificator returned by esp_vfs_register_with_id.
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* @param fd File descriptor which should be unregistered.
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*
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* @return ESP_OK if the registration is successful,
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* ESP_ERR_INVALID_ARG if the arguments are incorrect.
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*/
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esp_err_t esp_vfs_unregister_fd(esp_vfs_id_t vfs_id, int fd);
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/**
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* These functions are to be used in newlib syscall table. They will be called by
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* newlib when it needs to use any of the syscalls.
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*/
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/**@{*/
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ssize_t esp_vfs_write(struct _reent *r, int fd, const void * data, size_t size);
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off_t esp_vfs_lseek(struct _reent *r, int fd, off_t size, int mode);
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ssize_t esp_vfs_read(struct _reent *r, int fd, void * dst, size_t size);
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int esp_vfs_open(struct _reent *r, const char * path, int flags, int mode);
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int esp_vfs_close(struct _reent *r, int fd);
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int esp_vfs_fstat(struct _reent *r, int fd, struct stat * st);
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int esp_vfs_stat(struct _reent *r, const char * path, struct stat * st);
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int esp_vfs_link(struct _reent *r, const char* n1, const char* n2);
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int esp_vfs_unlink(struct _reent *r, const char *path);
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int esp_vfs_rename(struct _reent *r, const char *src, const char *dst);
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/**@}*/
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/**
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* @brief Synchronous I/O multiplexing which implements the functionality of POSIX select() for VFS
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* @param nfds Specifies the range of descriptors which should be checked.
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* The first nfds descriptors will be checked in each set.
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* @param readfds If not NULL, then points to a descriptor set that on input
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* specifies which descriptors should be checked for being
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* ready to read, and on output indicates which descriptors
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* are ready to read.
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* @param writefds If not NULL, then points to a descriptor set that on input
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* specifies which descriptors should be checked for being
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* ready to write, and on output indicates which descriptors
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* are ready to write.
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* @param errorfds If not NULL, then points to a descriptor set that on input
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* specifies which descriptors should be checked for error
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* conditions, and on output indicates which descriptors
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* have error conditions.
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* @param timeout If not NULL, then points to timeval structure which
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* specifies the time period after which the functions should
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* time-out and return. If it is NULL, then the function will
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* not time-out.
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*
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* @return The number of descriptors set in the descriptor sets, or -1
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* when an error (specified by errno) have occurred.
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*/
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int esp_vfs_select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *timeout);
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/**
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* @brief Notification from a VFS driver about a read/write/error condition
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*
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* This function is called when the VFS driver detects a read/write/error
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* condition as it was requested by the previous call to start_select.
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*
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* @param signal_sem semaphore handle which was passed to the driver by the start_select call
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*/
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void esp_vfs_select_triggered(SemaphoreHandle_t *signal_sem);
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/**
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* @brief Notification from a VFS driver about a read/write/error condition (ISR version)
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*
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* This function is called when the VFS driver detects a read/write/error
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* condition as it was requested by the previous call to start_select.
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*
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* @param signal_sem semaphore handle which was passed to the driver by the start_select call
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* @param woken is set to pdTRUE if the function wakes up a task with higher priority
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*/
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void esp_vfs_select_triggered_isr(SemaphoreHandle_t *signal_sem, BaseType_t *woken);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif //__ESP_VFS_H__
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