c++/3.3.5/cstdio:#undef fwrite
c++/3.3.5/cstdio:  using ::fwrite;
stdio.h:size_t	 fwrite(const void * __restrict, size_t, size_t, FILE * __restrict);
sys/fcntl.h: * FREAD and FWRITE are excluded from the #ifdef _KERNEL so that TIOCFLUSH,
sys/fcntl.h: * which was documented to use FREAD/FWRITE, continues to work.
sys/fcntl.h:#define	FWRITE		0x0002
sys/fcntl.h:/* convert from open() flags to/from fflags; convert O_RD/WR to FREAD/FWRITE */
sys/fcntl.h:#define	FMASK		(FREAD|FWRITE|FAPPEND|FASYNC|FFSYNC|FNONBLOCK|O_DIRECT)
sys/param.h:#define FWRITE  0x0002
sys/uio.h:#define FWRITE  2
