lwIP
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Outline
#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"
lwip_stop_socket_select(void *)
lwip_stop_socket_select_isr(void *, BaseType_t *)
lwip_get_socket_select_semaphore()
lwip_fcntl_r_wrapper(int, int, int)
lwip_ioctl_r_wrapper(int, int, va_list)
lwip_fstat(int, struct stat *)
esp_vfs_lwip_sockets_register()
Files
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SourceVuESP-IDF Framework and ExampleslwIPport/esp32xx/vfs_lwip.c
 
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/* * SPDX-FileCopyrightText: 2017-2022 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #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"11 includes #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 /** * @brief This function is implemented only in FreeRTOS port (ingroup sys_sem) * and has no official API counterpart in lwip's sys.h declarations * Signals a semaphore from ISR * @param sem the semaphore to signal * @return 1 if the signal has caused a high-prio task to unblock (pxHigherPriorityTaskWoken) *//* ... */ int sys_sem_signal_isr(sys_sem_t *sem); 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)); }{ ... }
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