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annotate autoconf/m4/func_mmap_file.m4 @ 116:a609e5c42ecc

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change from CGF to this
author mir3636
date Mon, 08 Aug 2016 19:47:00 +0900
parents 95c75e76d11b
children
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95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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1 #
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2 # Check for the ability to mmap a file.
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3 #
95c75e76d11b LLVM 3.4
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4 AC_DEFUN([AC_FUNC_MMAP_FILE],
95c75e76d11b LLVM 3.4
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5 [AC_CACHE_CHECK(for mmap of files,
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6 ac_cv_func_mmap_file,
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7 [ AC_LANG_PUSH([C])
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8 AC_RUN_IFELSE([
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9 AC_LANG_PROGRAM([[
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10 #include <sys/types.h>
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11 #include <sys/mman.h>
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12 #include <fcntl.h>
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13 ]],[[
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14 int fd;
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15 fd = creat ("foo",0777);
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16 fd = (int) mmap (0, 1, PROT_READ, MAP_SHARED, fd, 0);
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17 unlink ("foo");
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18 return (fd != (int) MAP_FAILED);]])],
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19 [ac_cv_func_mmap_file=yes],[ac_cv_func_mmap_file=no],[ac_cv_func_mmap_file=no])
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20 AC_LANG_POP([C])
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21 ])
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22 if test "$ac_cv_func_mmap_file" = yes; then
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23 AC_DEFINE([HAVE_MMAP_FILE],[],[Define if mmap() can map files into memory])
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24 AC_SUBST(MMAP_FILE,[yes])
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25 fi
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26 ])