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annotate doc/posix-functions/mmap.texi @ 10876:c83dc7e8df57

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Refer to new POSIX:2008 standard.
author Bruno Haible <bruno@clisp.org>
date Sun, 14 Dec 2008 14:38:13 +0100
parents 070329237839
children bb0ceefd22dc
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070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
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1 @node mmap
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2 @section @code{mmap}
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3 @findex mmap
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4
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c83dc7e8df57 Refer to new POSIX:2008 standard.
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5 POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/mmap.html}
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6
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7 Gnulib module: ---
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8
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9 Portability problems fixed by Gnulib:
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10 @itemize
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11 @end itemize
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12
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13 Portability problems not fixed by Gnulib:
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14 @itemize
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15 @item
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16 This function is missing on some platforms:
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17 mingw, BeOS.
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18 @item
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19 To get anonymous memory, on some platforms, you can use the flags
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20 @code{MAP_ANONYMOUS | MAP_PRIVATE} and @code{-1} instead of a file descriptor;
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21 on others you have to use a read-only file descriptor of @file{/dev/zero}.
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22 @item
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23 On HP-UX, passing a non-NULL first argument, as a hint for the address (even
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24 without @code{MAP_FIXED}, often causes @code{mmap} to fail. Better pass NULL
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25 in this case.
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26 @item
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27 On HP-UX, @code{MAP_FIXED} basically never works. On other platforms, it depends
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28 on the circumstances whether memory can be returned at a given address.
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29 @end itemize