diff options
Diffstat (limited to 'projects/sample/autoconf/m4/header_mmap_anonymous.m4')
| -rw-r--r-- | projects/sample/autoconf/m4/header_mmap_anonymous.m4 | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/projects/sample/autoconf/m4/header_mmap_anonymous.m4 b/projects/sample/autoconf/m4/header_mmap_anonymous.m4 new file mode 100644 index 0000000..2270d29 --- /dev/null +++ b/projects/sample/autoconf/m4/header_mmap_anonymous.m4 @@ -0,0 +1,21 @@ +# +# Check for anonymous mmap macros. This is modified from +# http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_slist.html +# +AC_DEFUN([AC_HEADER_MMAP_ANONYMOUS], +[AC_CACHE_CHECK(for MAP_ANONYMOUS vs. MAP_ANON, +ac_cv_header_mmap_anon, +[ AC_LANG_PUSH([C]) + AC_COMPILE_IFELSE([AC_LANG_PROGRAM( + [[#include <sys/mman.h> +#include <unistd.h> +#include <fcntl.h>]], + [[mmap (0, 1, PROT_READ, MAP_ANONYMOUS, -1, 0); return (0);]])], + ac_cv_header_mmap_anon=yes, + ac_cv_header_mmap_anon=no) + AC_LANG_POP([C]) +]) +if test "$ac_cv_header_mmap_anon" = yes; then + AC_DEFINE([HAVE_MMAP_ANONYMOUS],[1],[Define if mmap() uses MAP_ANONYMOUS to map anonymous pages, or undefine if it uses MAP_ANON]) +fi +]) |
