mirror of
https://github.com/espressif/esp-protocols.git
synced 2025-11-04 00:21:37 +01:00
77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/*
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* SPDX-FileCopyrightText: 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 <fcntl.h>
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#include "lwip/sockets.h"
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#include "socketpair.h"
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#include "esp_check.h"
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#define INVALID_SOCKET (-1)
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static const char *TAG = "socket_helpers";
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int socketpair(int domain, int type, int protocol, int sv[2])
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{
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if (protocol != 0 || type != SOCK_STREAM || domain != AF_UNIX) {
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errno = ENOSYS; // not implemented
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return -1;
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}
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struct sockaddr_storage ss;
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struct sockaddr_in *sa = (struct sockaddr_in *)&ss;
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socklen_t ss_len = sizeof(struct sockaddr_in);
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int fd1 = INVALID_SOCKET;
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int fd2 = INVALID_SOCKET;
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int listenfd = INVALID_SOCKET;
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int ret = 0; // Success
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sa->sin_family = AF_INET;
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sa->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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sa->sin_port = 0;
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listenfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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ESP_GOTO_ON_FALSE(listenfd != INVALID_SOCKET, -1, err, TAG, "Cannot create listening socket");
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ESP_GOTO_ON_FALSE(listen(listenfd, 1) == 0, -1, err, TAG, "Failed to listen");
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memset(&ss, 0, sizeof(ss));
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ss_len = sizeof(ss);
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ESP_GOTO_ON_FALSE(getsockname(listenfd, (struct sockaddr *)&ss, &ss_len) >= 0, -1, err, TAG, "getsockname failed");
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sa->sin_family = AF_INET;
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sa->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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fd1 = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
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ESP_GOTO_ON_FALSE(fd1 != INVALID_SOCKET, -1, err, TAG, "Cannot create read side socket");
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ESP_GOTO_ON_FALSE(connect(fd1, (struct sockaddr *)&ss, ss_len) >= 0, -1, err, TAG, "Failed to connect fd1");
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fd2 = accept(listenfd, NULL, 0);
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ESP_GOTO_ON_FALSE(fd2 != INVALID_SOCKET, -1, err, TAG, "Failed to accept fd2");
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close(listenfd);
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sv[0] = fd1;
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sv[1] = fd2;
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return ret;
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err:
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if (listenfd != INVALID_SOCKET) {
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close(listenfd);
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}
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if (fd1 != INVALID_SOCKET) {
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close(fd1);
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}
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return ret;
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}
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int pipe(int pipefd[2])
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{
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, pipefd) == -1) {
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return -1;
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}
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// Close the unwanted ends to make it a unidirectional pipe
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if (shutdown(pipefd[0], SHUT_WR) == -1 || shutdown(pipefd[1], SHUT_RD) == -1) {
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close(pipefd[0]);
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close(pipefd[1]);
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return -1;
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}
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return 0;
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}
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