The @code{F_DUPFD} action of this function does not reject
out-of-range targets properly on some platforms:
Cygwin 1.5.x.
+
+@item
+This function is missing on some platforms:
+mingw.
@end itemize
Portability problems not fixed by Gnulib:
@itemize
@item
-This function is missing on some platforms:
-mingw.
+The replacement function does not support @code{F_SETFD},
+@code{F_GETFL}, @code{F_SETFL}, @code{F_GETOWN}, @code{F_SETOWN},
+@code{F_GETLK}, @code{F_SETLK}, and @code{F_SETLKW} on some platforms:
+mingw
@end itemize