Programming and posix getting started

31
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;
}