fd_set_nonblock.c

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/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2026 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 */


case OP_FD_SET_NONBLOCK: {
 /* Pops on:int (0/1), fd:int; pushes 1 on success, 0 on error/unsupported */
 Value onv = pop_value(vm);
 Value fdv = pop_value(vm);
 int ok = 0;
#ifdef __unix__
 if (fdv.type != VAL_INT || onv.type != VAL_INT) {
 fprintf(stderr, "Runtime type error: fd_set_nonblock expects (int fd, int on)\n");
 ok = 0;
 } else {
 int fd = (int)fdv.i;
 int on = (int)onv.i;
 int flags = fcntl(fd, F_GETFL, 0);
 if (flags >= 0) {
 if (on)
 flags |= O_NONBLOCK;
 else
 flags &= ~O_NONBLOCK;
 if (fcntl(fd, F_SETFL, flags) == 0) ok = 1;
 }
 }
#else
 (void)onv; (void)fdv;
#endif
 free_value(onv);
 free_value(fdv);
 push_value(vm, make_int(ok ? 1 : 0));
 break;
}