mirror of
https://github.com/espressif/esp-idf.git
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78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
// Copyright 2017 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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#include <string.h>
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#include <stdbool.h>
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#include <stdarg.h>
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#include <sys/errno.h>
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#include <sys/lock.h>
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#include <sys/fcntl.h>
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#include "esp_vfs.h"
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#include "esp_vfs_dev.h"
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#include "esp_attr.h"
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#include "soc/uart_struct.h"
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#include "lwip/sockets.h"
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#include "sdkconfig.h"
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/* LWIP is a special case for VFS use.
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From the LWIP side:
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- We set LWIP_SOCKET_OFFSET dynamically at VFS registration time so that native LWIP socket functions & VFS functions
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see the same fd space. This is necessary to mix POSIX file operations defined in VFS with POSIX socket operations defined
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in LWIP, without needing to wrap all of them.
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From the VFS side:
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- ESP_VFS_FLAG_SHARED_FD_SPACE is set, so unlike other VFS implementations the FDs that the LWIP "VFS" sees and the
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FDs that the user sees are the same FDs.
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*/
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int lwip_socket_offset;
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static int lwip_fcntl_r_wrapper(int fd, int cmd, va_list args);
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static int lwip_ioctl_r_wrapper(int fd, int cmd, va_list args);
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void esp_vfs_lwip_sockets_register()
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{
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esp_vfs_t vfs = {
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.flags = ESP_VFS_FLAG_DEFAULT | ESP_VFS_FLAG_SHARED_FD_SPACE,
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.write = &lwip_write_r,
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.open = NULL,
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.fstat = NULL,
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.close = &lwip_close_r,
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.read = &lwip_read_r,
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.fcntl = &lwip_fcntl_r_wrapper,
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.ioctl = &lwip_ioctl_r_wrapper,
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};
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int max_fd;
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ESP_ERROR_CHECK(esp_vfs_register_socket_space(&vfs, NULL, &lwip_socket_offset, &max_fd));
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/* LWIP can't be allowed to create more sockets than fit in the per-VFS fd space. Currently this isn't configurable
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* but it's set much larger than CONFIG_LWIP_MAX_SOCKETS should ever be (max 2^12 FDs).
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*/
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assert(max_fd >= lwip_socket_offset && CONFIG_LWIP_MAX_SOCKETS <= max_fd - lwip_socket_offset);
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}
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static int lwip_fcntl_r_wrapper(int fd, int cmd, va_list args)
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{
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return lwip_fcntl_r(fd, cmd, va_arg(args, int));
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}
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static int lwip_ioctl_r_wrapper(int fd, int cmd, va_list args)
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{
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return lwip_ioctl_r(fd, cmd, va_arg(args, void *));
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}
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