serial_close.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
 */
 
/**
 * @file serial_close.c
 * @brief Implements OP_SERIAL_CLOSE to close an open serial port.
 *
 * Behavior:
 * - Pops fd (int); attempts to close it; pushes 1 on success, 0 on failure.
 * - Only supported on UNIX-like systems.
 *
 * Errors:
 * - If argument type is wrong, prints an error and returns 0.
 */
 
#ifdef __unix__
#include <unistd.h>
#endif
 
case OP_SERIAL_CLOSE: {
  /* Pops fd (int); returns 1/0 */
  Value fdv = pop_value(vm);
  int ok = 0;
#ifdef __unix__
  if (fdv.type != VAL_INT) {
    fprintf(stderr, "Runtime type error: serial_close expects (int fd)\n");
  } else {
    int fd = (int)fdv.i;
    if (close(fd) == 0) ok = 1;
  }
#endif
  free_value(fdv);
  push_value(vm, make_int(ok));
  break;
}