680 safeopen(fn, omode, cmode, sff)  in safeopen()  argument
682 	int omode;
696 			   fn, omode, cmode, sff);
698 	if (bitset(O_CREAT, omode))
700 	omode &= ~O_CREAT;
701 	switch (omode & O_ACCMODE)
731 		omode |= O_CREAT | (bitset(SFF_NOTEXCL, sff) ? 0 : O_EXCL);
732 	else if (bitset(SFF_CREAT, sff) && bitset(O_EXCL, omode))
740 	truncate = bitset(O_TRUNC, omode);
742 		omode &= ~O_TRUNC;
745 	fd = dfopen(fn, omode, cmode, sff);
787 safefopen(fn, omode, cmode, sff)  in safefopen()  argument
789 	int omode;
798 	switch (omode & O_ACCMODE)
805 		if (bitset(O_APPEND, omode))
812 		if (bitset(O_TRUNC, omode))
814 		else if (bitset(O_APPEND, omode))
821 		syserr("554 5.3.5 safefopen: unknown omode %o", omode);
824 	fd = safeopen(fn, omode, cmode, sff);
843 			   fn, fmode, omode, sff, sm_errstring(errno));
926 dfopen(filename, omode, cmode, sff)  in dfopen()  argument
928 	int omode;
940 		fd = open(filename, omode, cmode);
962 		if ((omode & O_ACCMODE) != O_RDONLY)