mirror of
https://github.com/espressif/esp-idf.git
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78 lines
2.8 KiB
C
78 lines
2.8 KiB
C
/*
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* SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "sdkconfig.h"
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#include "esp_vfs.h"
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#include "esp_vfs_common.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if CONFIG_VFS_SELECT_IN_RAM
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#define VFS_MALLOC_FLAGS (MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT)
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#else
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#define VFS_MALLOC_FLAGS MALLOC_CAP_DEFAULT
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#endif
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typedef struct vfs_entry_ {
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esp_vfs_t vfs; // contains pointers to VFS functions
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char path_prefix[ESP_VFS_PATH_MAX]; // path prefix mapped to this VFS
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size_t path_prefix_len; // micro-optimization to avoid doing extra strlen
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void* ctx; // optional pointer which can be passed to VFS
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int offset; // index of this structure in s_vfs array
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} vfs_entry_t;
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/**
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* Register a virtual filesystem.
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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, may be empty.
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* If not empty, must be 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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* In the special case of an empty base_path, a "fallback"
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* VFS is registered. Such VFS will handle paths which are not
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* matched by any other registered VFS.
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* @param len Length of the base_path.
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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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* @param vfs_index Index for getting the vfs content.
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*
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* @return ESP_OK if successful.
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* ESP_ERR_NO_MEM if too many VFSes are registered.
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* ESP_ERR_INVALID_ARG if given an invalid parameter.
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*/
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esp_err_t esp_vfs_register_common(const char *base_path, size_t len, const esp_vfs_t* vfs, void* ctx, int *vfs_index);
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/**
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* Get vfs fd with given path.
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*
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* @param path file path prefix associated with the filesystem.
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*
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* @return Pointer to the `vfs_entry_t` corresponding to the given path, which cannot be NULL.
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*/
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const vfs_entry_t *get_vfs_for_path(const char *path);
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/**
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* Get vfs fd with given vfs index.
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*
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* @param index VFS index.
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*
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* @return Pointer to the `vfs_entry_t` corresponding to the given path, which cannot be NULL.
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*/
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const vfs_entry_t *get_vfs_for_index(int index);
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#ifdef __cplusplus
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}
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#endif
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