forked from openkylin/qpdf
32 lines
1.2 KiB
Plaintext
32 lines
1.2 KiB
Plaintext
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dnl @synopsis AX_RANDOM_DEVICE
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dnl
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dnl This macro will check for a random device, allowing the user to explicitly
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dnl set the path. The user uses '--with-random=FILE' as an argument to
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dnl configure.
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dnl
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dnl If A random device is found then HAVE_RANDOM_DEVICE is set to 1 and
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dnl RANDOM_DEVICE contains the path.
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dnl
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dnl @category Miscellaneous
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dnl @author Martin Ebourne
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dnl @version 2005/07/01
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dnl @license AllPermissive
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AC_DEFUN([AX_RANDOM_DEVICE], [
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AC_ARG_WITH([random],
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[AC_HELP_STRING([--with-random=FILE], [Use FILE as random number seed [auto-detected]])],
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[RANDOM_DEVICE="$withval"],
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[AC_CHECK_FILE("/dev/urandom", [RANDOM_DEVICE="/dev/urandom";],
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[AC_CHECK_FILE("/dev/arandom", [RANDOM_DEVICE="/dev/arandom";],
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[AC_CHECK_FILE("/dev/random", [RANDOM_DEVICE="/dev/random";])]
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)])
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])
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if test "x$RANDOM_DEVICE" != "x" ; then
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AC_DEFINE([HAVE_RANDOM_DEVICE], 1,
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[Define to 1 (and set RANDOM_DEVICE) if a random device is available])
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AC_SUBST([RANDOM_DEVICE])
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AC_DEFINE_UNQUOTED([RANDOM_DEVICE], ["$RANDOM_DEVICE"],
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[Define to the filename of the random device (and set HAVE_RANDOM_DEVICE)])
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fi
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])dnl
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