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vfs_lwip.c
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vfs_lwip.c
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// Copyright 2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string.h>
#include <stdbool.h>
#include <stdarg.h>
#include <sys/errno.h>
#include <sys/lock.h>
#include <sys/fcntl.h>
#include "esp_attr.h"
#include "esp_vfs.h"
#include "sdkconfig.h"
#include "lwip/sockets.h"
#include "lwip/sys.h"
#ifndef CONFIG_VFS_SUPPORT_IO
#error This file should only be built when CONFIG_VFS_SUPPORT_IO=y
#endif
_Static_assert(MAX_FDS >= CONFIG_LWIP_MAX_SOCKETS, "MAX_FDS < CONFIG_LWIP_MAX_SOCKETS");
#ifdef CONFIG_VFS_SUPPORT_SELECT
static void lwip_stop_socket_select(void *sem)
{
sys_sem_signal(sem); //socket_select will return
}
static void lwip_stop_socket_select_isr(void *sem, BaseType_t *woken)
{
if (sys_sem_signal_isr(sem) && woken) {
*woken = pdTRUE;
}
}
static void *lwip_get_socket_select_semaphore(void)
{
/* Calling this from the same process as select() will ensure that the semaphore won't be allocated from
* ISR (lwip_stop_socket_select_isr).
*/
return (void *) sys_thread_sem_get();
}
#else // CONFIG_VFS_SUPPORT_SELECT
int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds, struct timeval *timeout)
{
return lwip_select(nfds, readfds, writefds, errorfds, timeout);
}
#endif // CONFIG_VFS_SUPPORT_SELECT
static int lwip_fcntl_r_wrapper(int fd, int cmd, int arg)
{
return lwip_fcntl(fd, cmd, arg);
}
static int lwip_ioctl_r_wrapper(int fd, int cmd, va_list args)
{
return lwip_ioctl(fd, cmd, va_arg(args, void *));
}
static int lwip_fstat(int fd, struct stat * st)
{
if (st == NULL || fd < LWIP_SOCKET_OFFSET || fd > (MAX_FDS - 1)) {
errno = EBADF;
return -1;
}
memset(st, 0, sizeof(*st));
/* set the stat mode to socket type */
st->st_mode = S_IFSOCK;
return 0;
}
void esp_vfs_lwip_sockets_register(void)
{
esp_vfs_t vfs = {
.flags = ESP_VFS_FLAG_DEFAULT,
.write = &lwip_write,
.open = NULL,
.fstat = &lwip_fstat,
.close = &lwip_close,
.read = &lwip_read,
.fcntl = &lwip_fcntl_r_wrapper,
.ioctl = &lwip_ioctl_r_wrapper,
#ifdef CONFIG_VFS_SUPPORT_SELECT
.socket_select = &lwip_select,
.get_socket_select_semaphore = &lwip_get_socket_select_semaphore,
.stop_socket_select = &lwip_stop_socket_select,
.stop_socket_select_isr = &lwip_stop_socket_select_isr,
#endif // CONFIG_VFS_SUPPORT_SELECT
};
/* Non-LWIP file descriptors are from 0 to (LWIP_SOCKET_OFFSET-1). LWIP
* file descriptors are registered from LWIP_SOCKET_OFFSET to
* MAX_FDS-1.
*/
ESP_ERROR_CHECK(esp_vfs_register_fd_range(&vfs, NULL, LWIP_SOCKET_OFFSET, MAX_FDS));
}