27 lines
679 B
Plaintext
27 lines
679 B
Plaintext
#
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# Check for the ability to mmap a file.
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#
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AC_DEFUN([AC_FUNC_MMAP_FILE],
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[AC_CACHE_CHECK(for mmap of files,
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ac_cv_func_mmap_file,
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[ AC_LANG_PUSH([C])
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AC_RUN_IFELSE([
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AC_LANG_PROGRAM([[
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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]],[[
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int fd;
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fd = creat ("foo",0777);
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fd = (int) mmap (0, 1, PROT_READ, MAP_SHARED, fd, 0);
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unlink ("foo");
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return (fd != (int) MAP_FAILED);]])],
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[ac_cv_func_mmap_file=yes],[ac_cv_func_mmap_file=no],[ac_cv_func_mmap_file=no])
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AC_LANG_POP([C])
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])
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if test "$ac_cv_func_mmap_file" = yes; then
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AC_DEFINE([HAVE_MMAP_FILE],[],[Define if mmap() can map files into memory])
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AC_SUBST(MMAP_FILE,[yes])
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fi
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])
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