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feat(httpd): Allow binding to same address and port upon restarting server without delay

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Issue : Restarting the server without 30sec delay between httpd_stop() and httpd_start() causes EADDRINUSE error
Resolution : Use setsockopt() to enable SO_REUSEADDR on listener socket

Closes https://github.com/espressif/esp-idf/issues/3381
This commit is contained in:
Chen Wu
2023-05-05 17:46:05 +08:00
parent 35375c17be
commit d93c5bb861
1 changed files with 10 additions and 0 deletions
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10
components/esp_http_server/src/httpd_main.c
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@ -262,6 +262,16 @@ static esp_err_t httpd_server_init(struct httpd_data *hd)
.sin_port = htons(hd->config.server_port)
};
#endif /* CONFIG_LWIP_IPV6 */
/* Enable SO_REUSEADDR to allow binding to the same
* address and port when restarting the server */
int enable = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(enable)) < 0) {
/* This will fail if CONFIG_LWIP_SO_REUSE is not enabled. But
* it does not affect the normal working of the HTTP Server */
ESP_LOGW(TAG, LOG_FMT("error in setsockopt SO_REUSEADDR (%d)"), errno);
}
int ret = bind(fd, (struct sockaddr *)&serv_addr, sizeof(serv_addr));
if (ret < 0) {
ESP_LOGE(TAG, LOG_FMT("error in bind (%d)"), errno);