[cs631apue] Test if file is whiteout

[Jan Schaumann]

Keyur M Ved <kved at stevens.edu> wrote:
 
> I noticed in the the man page for stat there are macros to test if a
> file is a directory, character device, block device, fifo, symbolic
> link and a socket, but none to test if a file is whiteout. Is there a
> different way to test if a file is a whiteout file?

There actually is a macro to test:

$ grep S_ISWHT /usr/include/sys/stat.h 
#define S_ISWHT(m)      (((m) & _S_IFMT) == _S_IFWHT)   /* whiteout */
$ 

-Jan