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Diffstat (limited to 'gnulib/doc/posix-functions/mmap.texi')
| m--------- | gnulib | 0 | ||||
| -rw-r--r-- | gnulib/doc/posix-functions/mmap.texi | 33 |
2 files changed, 33 insertions, 0 deletions
diff --git a/gnulib b/gnulib deleted file mode 160000 -Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1 diff --git a/gnulib/doc/posix-functions/mmap.texi b/gnulib/doc/posix-functions/mmap.texi new file mode 100644 index 0000000..19a39a6 --- /dev/null +++ b/gnulib/doc/posix-functions/mmap.texi @@ -0,0 +1,33 @@ +@node mmap +@section @code{mmap} +@findex mmap + +POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/mmap.html} + +Gnulib module: --- + +Portability problems fixed by Gnulib: +@itemize +@end itemize + +Portability problems not fixed by Gnulib: +@itemize +@item +This function is missing on some platforms: +mingw, MSVC 9, 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}. +@item +On HP-UX, passing a non-NULL first argument, as a hint for the address (even +without @code{MAP_FIXED}, often causes @code{mmap} to fail. Better pass NULL +in this case. +@item +On HP-UX, @code{MAP_FIXED} basically never works. On other platforms, it depends +on the circumstances whether memory can be returned at a given address. +@end itemize |