socket_tcp_connect.c

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/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2025 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 */


case OP_SOCK_TCP_CONNECT: {
 /* Pops port, host; pushes fd (>0) or 0 */
 Value portv = pop_value(vm);
 Value hostv = pop_value(vm);
 int fd = 0;
#ifdef __unix__
 if (hostv.type != VAL_STRING || portv.type != VAL_INT) {
 fprintf(stderr, "Runtime type error: tcp_connect expects (string host, int port)\n");
 free_value(portv);
 free_value(hostv);
 push_value(vm, make_int(0));
 break;
 }
 char *host = value_to_string_alloc(&hostv);
 int port = (int)portv.i;
 if (host) {
 char portstr[16];
 snprintf(portstr, sizeof(portstr), "%d", port);
 struct addrinfo hints, *res = NULL, *rp;
 memset(&hints, 0, sizeof(hints));
 hints.ai_family = AF_UNSPEC;
 hints.ai_socktype = SOCK_STREAM;
 if (getaddrinfo(host, portstr, &hints, &res) == 0) {
 for (rp = res; rp != NULL; rp = rp->ai_next) {
 int s = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
 if (s < 0) continue;
 if (connect(s, rp->ai_addr, rp->ai_addrlen) == 0) {
 fd = s;
 break;
 }
 close(s);
 }
 if (res) freeaddrinfo(res);
 }
 free(host);
 }
#endif
 free_value(portv);
 free_value(hostv);
 push_value(vm, make_int(fd > 0 ? fd : 0));
 break;
}