BLK_UNKNOWN       112 srclib/apr/file_io/netware/pipe.c     (*file)->blocking = BLK_UNKNOWN; /* app needs to make a timeout call */
BLK_UNKNOWN       187 srclib/apr/file_io/os2/pipe.c     (*file)->blocking = BLK_UNKNOWN; /* app needs to make a timeout call */
BLK_UNKNOWN       243 srclib/apr/file_io/unix/open.c     (*file)->blocking = BLK_UNKNOWN; /* in case it is a pipe */
BLK_UNKNOWN       147 srclib/apr/file_io/unix/pipe.c     (*file)->blocking = BLK_UNKNOWN; /* app needs to make a timeout call */