When will fopen fail?

[Tom Kovar]

In article <11079 at uwm.edu> markh at csd4.csd.uwm.edu (Mark William Hopkins) writes:
>
>   Assuming all the subdirectories are there and writeable (on UNIX or
>MS-DOS), when does
>
>		     FP = fopen("...", "w");
>
>fail and return FP == NULL?

 ... file system full
 ... user quota exceeded
 ... file system mounted read only

 ... any other ideas??
							...Tom