681 safeopen(fn, omode, cmode, sff)  in safeopen()  argument
683 	int omode;
697 			   fn, omode, cmode, sff);
699 	if (bitset(O_CREAT, omode))
701 	omode &= ~O_CREAT;
702 	switch (omode & O_ACCMODE)
732 		omode |= O_CREAT | (bitset(SFF_NOTEXCL, sff) ? 0 : O_EXCL);
733 	else if (bitset(SFF_CREAT, sff) && bitset(O_EXCL, omode))
741 	truncate = bitset(O_TRUNC, omode);
743 		omode &= ~O_TRUNC;
746 	fd = dfopen(fn, omode, cmode, sff);
788 safefopen(fn, omode, cmode, sff)  in safefopen()  argument
790 	int omode;
799 	switch (omode & O_ACCMODE)
806 		if (bitset(O_APPEND, omode))
813 		if (bitset(O_TRUNC, omode))
815 		else if (bitset(O_APPEND, omode))
822 		syserr("554 5.3.5 safefopen: unknown omode %o", omode);
825 	fd = safeopen(fn, omode, cmode, sff);
844 			   fn, fmode, omode, sff, sm_errstring(errno));
927 dfopen(filename, omode, cmode, sff)  in dfopen()  argument
929 	int omode;
941 		fd = open(filename, omode, cmode);
963 		if ((omode & O_ACCMODE) != O_RDONLY)