Mercurial > hg > octave-shane > gnulib-hg

annotate doc/posix-functions/mmap.texi @ 17632:86af85d364e1 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
unistd: port readlink to Mac OS X 10.3.9 * lib/unistd.in.h (_GL_INCLUDING_UNISTD_H): New macro, to work around self-include problem in Mac OS X 10.3.9 when combined with readlink module. Problem reported by Klaus Zietler in <http://bugs.gnu.org/16825>.
author Paul Eggert <eggert@penguin.cs.ucla.edu>
date Tue, 25 Feb 2014 11:16:27 -0800
parents 6355dc4626b5
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
9638
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
1 @node mmap
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
2 @section @code{mmap}
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
3 @findex mmap
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
4
13549
bb0ceefd22dc avoid some overlong lines from posix urls, etc.
Karl Berry <karl@freefriends.org>
parents: 10876
diff changeset
5 POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/mmap.html}
9638
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
6
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
7 Gnulib module: ---
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
8
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
9 Portability problems fixed by Gnulib:
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
10 @itemize
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
11 @end itemize
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
12
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
13 Portability problems not fixed by Gnulib:
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
14 @itemize
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
15 @item
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
16 This function is missing on some platforms:
15607
6355dc4626b5 doc: Update regarding MSVC 9.
Bruno Haible <bruno@clisp.org>
parents: 15458
diff changeset
17 mingw, MSVC 9, BeOS.
9638
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
18 @item
15458
f4cc0c20e892 doc: Mention the effects of AC_SYS_LARGEFILE.
Bruno Haible <bruno@clisp.org>
parents: 13549
diff changeset
19 On platforms where @code{off_t} is a 32-bit type, this function may not
f4cc0c20e892 doc: Mention the effects of AC_SYS_LARGEFILE.
Bruno Haible <bruno@clisp.org>
parents: 13549
diff changeset
20 work correctly across the entire data range of files larger than 2 GB.
f4cc0c20e892 doc: Mention the effects of AC_SYS_LARGEFILE.
Bruno Haible <bruno@clisp.org>
parents: 13549
diff changeset
21 The fix is to use the @code{AC_SYS_LARGEFILE} macro.
f4cc0c20e892 doc: Mention the effects of AC_SYS_LARGEFILE.
Bruno Haible <bruno@clisp.org>
parents: 13549
diff changeset
22 @item
9638
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
23 To get anonymous memory, on some platforms, you can use the flags
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
24 @code{MAP_ANONYMOUS | MAP_PRIVATE} and @code{-1} instead of a file descriptor;
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
25 on others you have to use a read-only file descriptor of @file{/dev/zero}.
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
26 @item
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
27 On HP-UX, passing a non-NULL first argument, as a hint for the address (even
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
28 without @code{MAP_FIXED}, often causes @code{mmap} to fail. Better pass NULL
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
29 in this case.
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
30 @item
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
31 On HP-UX, @code{MAP_FIXED} basically never works. On other platforms, it depends
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
32 on the circumstances whether memory can be returned at a given address.
070329237839 Rename two directories: headers -> posix-headers, functions -> posix-functions.
Bruno Haible <bruno@clisp.org>
parents:
diff changeset
33 @end itemize