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* doc/gnulib-intro.texi (Target Platforms): Classify MSVC as "rarely tested". * doc/posix-functions/*.texi: Update with info about MSVC 9. * doc/posix-headers/*.texi: Likewise. * doc/pastposix-functions/*.texi: Likewise. * doc/glibc-functions/*.texi: Likewise. * doc/glibc-headers/*.texi: Likewise.
34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
@node mmap
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@section @code{mmap}
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@findex mmap
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/mmap.html}
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Gnulib module: ---
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Portability problems fixed by Gnulib:
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@itemize
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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This function is missing on some platforms:
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mingw, MSVC 9, BeOS.
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@item
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On platforms where @code{off_t} is a 32-bit type, this function may not
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work correctly across the entire data range of files larger than 2 GB.
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The fix is to use the @code{AC_SYS_LARGEFILE} macro.
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@item
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To get anonymous memory, on some platforms, you can use the flags
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@code{MAP_ANONYMOUS | MAP_PRIVATE} and @code{-1} instead of a file descriptor;
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on others you have to use a read-only file descriptor of @file{/dev/zero}.
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@item
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On HP-UX, passing a non-NULL first argument, as a hint for the address (even
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without @code{MAP_FIXED}, often causes @code{mmap} to fail. Better pass NULL
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in this case.
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@item
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On HP-UX, @code{MAP_FIXED} basically never works. On other platforms, it depends
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on the circumstances whether memory can be returned at a given address.
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@end itemize
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