Creates the file if necessary. Implies
.Ql write .
.It Ic exclusive , excl
+.Dv O_EXCL:
+Fails if the file already exists. Implies write and create. May
+not be used with
+.Ql truncate .
+.It Ic truncate , trunc
.Dv O_TRUNC:
Truncate any existing file. Implies
.Ql write .