_S_IFIFO           44 kern/include/stat.h #define S_IFIFO  _S_IFIFO
_S_IFIFO           46 user/include/sys/stat.h #define S_ISIFO(mode) ((mode & _S_IFMT) == _S_IFIFO)
_S_IFIFO           59 user/include/sys/stat.h #define S_IFIFO  _S_IFIFO