as modified by the process'
umask value (see
.Xr umask 2 ) .
+.\" C11 ยง7.21.5.3p7
.Pp
-Reads and writes may be intermixed on read/write streams in any order,
-and do not require an intermediate seek as in previous versions of
-.Em stdio .
-This is not portable to other systems, however;
-.Tn ANSI C
-requires that
-a file positioning function intervene between output and input, unless
-an input operation encounters end-of-file.
+Reads and writes may be intermixed on read/write streams in any order; however,
+a file positioning function must be called when switching between output and
+input, unless an input operation encounters end-of-file.
.Pp
The
.Fn fdopen