| 1 | dnl @synopsis AX_RANDOM_DEVICE |
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| 2 | dnl |
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| 3 | dnl This macro will check for a random device, allowing the user to explicitly |
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| 4 | dnl set the path. The user uses '--with-random=FILE' as an argument to |
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| 5 | dnl configure. |
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| 6 | dnl |
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| 7 | dnl If A random device is found then HAVE_RANDOM_DEVICE is set to 1 and |
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| 8 | dnl RANDOM_DEVICE contains the path. |
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| 9 | dnl |
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| 10 | dnl @category Miscellaneous |
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| 11 | dnl @author Martin Ebourne |
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| 12 | dnl @version 2005/07/01 |
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| 13 | dnl @license AllPermissive |
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| 14 | |
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| 15 | AC_DEFUN([AX_RANDOM_DEVICE], [ |
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| 16 | AC_ARG_WITH([random], |
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| 17 | [AC_HELP_STRING([--with-random=FILE], [Use FILE as random number seed [auto-detected]])], |
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| 18 | [RANDOM_DEVICE="$withval"], |
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| 19 | [AC_CHECK_FILE("/dev/urandom", [RANDOM_DEVICE="/dev/urandom";], |
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| 20 | [AC_CHECK_FILE("/dev/arandom", [RANDOM_DEVICE="/dev/arandom";], |
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| 21 | [AC_CHECK_FILE("/dev/random", [RANDOM_DEVICE="/dev/random";])] |
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| 22 | )]) |
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| 23 | ]) |
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| 24 | if test "x$RANDOM_DEVICE" != "x" ; then |
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| 25 | AC_DEFINE([HAVE_RANDOM_DEVICE], 1, |
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| 26 | [Define to 1 (and set RANDOM_DEVICE) if a random device is available]) |
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| 27 | AC_SUBST([RANDOM_DEVICE]) |
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| 28 | AC_DEFINE_UNQUOTED([RANDOM_DEVICE], ["$RANDOM_DEVICE"], |
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| 29 | [Define to the filename of the random device (and set HAVE_RANDOM_DEVICE)]) |
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| 30 | fi |
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| 31 | ])dnl |
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