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comparison autoconf/m4/func_mmap_file.m4 @ 0:95c75e76d11b

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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-1:000000000000 0:95c75e76d11b
1 #
2 # Check for the ability to mmap a file.
3 #
4 AC_DEFUN([AC_FUNC_MMAP_FILE],
5 [AC_CACHE_CHECK(for mmap of files,
6 ac_cv_func_mmap_file,
7 [ AC_LANG_PUSH([C])
8 AC_RUN_IFELSE([
9 AC_LANG_PROGRAM([[
10 #include <sys/types.h>
11 #include <sys/mman.h>
12 #include <fcntl.h>
13 ]],[[
14 int fd;
15 fd = creat ("foo",0777);
16 fd = (int) mmap (0, 1, PROT_READ, MAP_SHARED, fd, 0);
17 unlink ("foo");
18 return (fd != (int) MAP_FAILED);]])],
19 [ac_cv_func_mmap_file=yes],[ac_cv_func_mmap_file=no],[ac_cv_func_mmap_file=no])
20 AC_LANG_POP([C])
21 ])
22 if test "$ac_cv_func_mmap_file" = yes; then
23 AC_DEFINE([HAVE_MMAP_FILE],[],[Define if mmap() can map files into memory])
24 AC_SUBST(MMAP_FILE,[yes])
25 fi
26 ])