@section @code{mmap}
@findex mmap
-POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/mmap.html}
+POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/mmap.html}
Gnulib module: ---
This function is missing on some platforms:
mingw, BeOS.
@item
+On platforms where @code{off_t} is a 32-bit type, this function may not
+work correctly across the entire data range of files larger than 2 GB.
+The fix is to use the @code{AC_SYS_LARGEFILE} macro.
+@item
To get anonymous memory, on some platforms, you can use the flags
@code{MAP_ANONYMOUS | MAP_PRIVATE} and @code{-1} instead of a file descriptor;
on others you have to use a read-only file descriptor of @file{/dev/zero}.