Ever wanted to know what a particular error code means when you are left without the informative error message text?
Use the following small C program to find out:
int main (int argc, char* argv)
if (argc < 2)
printf("Supply the errno on the cmdline.\n");
errno = atoi(argv);
This can be considered a very simple equivalent to the Windows 'Visual C++ Error Lookup' program (but I've also included here to test out Geshi syntax highlighting).