Slide 31 of 42

Debugging Your Application - 1

• Add printf() statements in your code
- use #ifdef DEBUG compile directive


• Add perror() statements in your code
- use #ifdef PRINT_ERROR compile directive

if ( (fd = open(pathname, O_RDWR)) < 0)
{
    /* errno already set by open() */
#if defined(DEBUG) || defined(PRINT_ERROR)
    sprintf(msg, "functionX(): open(%s, O_RDWR)", pathname);
    perror(msg);
#endif
    return -1;
}