1 dnl @synopsis AX_RANDOM_DEVICE
3 dnl This macro will check for a random device, allowing the user to explicitly
4 dnl set the path. The user uses '--with-random=FILE' as an argument to
7 dnl If A random device is found then HAVE_RANDOM_DEVICE is set to 1 and
8 dnl RANDOM_DEVICE contains the path.
10 dnl @category Miscellaneous
11 dnl @author Martin Ebourne
12 dnl @version 2005/07/01
13 dnl @license AllPermissive
15 AC_DEFUN([AX_RANDOM_DEVICE], [
17 [AC_HELP_STRING([--with-random=FILE], [Use FILE as random number seed [auto-detected]])],
18 [RANDOM_DEVICE="$withval"],
19 [AC_CHECK_FILE("/dev/urandom", [RANDOM_DEVICE="/dev/urandom";],
20 [AC_CHECK_FILE("/dev/arandom", [RANDOM_DEVICE="/dev/arandom";],
21 [AC_CHECK_FILE("/dev/random", [RANDOM_DEVICE="/dev/random";])]
24 if test "x$RANDOM_DEVICE" != "x" ; then
25 AC_DEFINE([HAVE_RANDOM_DEVICE], 1,
26 [Define to 1 (and set RANDOM_DEVICE) if a random device is available])
27 AC_SUBST([RANDOM_DEVICE])
28 AC_DEFINE_UNQUOTED([RANDOM_DEVICE], ["$RANDOM_DEVICE"],
29 [Define to the filename of the random device (and set HAVE_RANDOM_DEVICE)])