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@@ -1,3 +1,22 @@
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+/*
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+ * Based on an example code from Roberto E. Vargas Caballero.
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+ *
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+ * Copyright (c) 2020 Jan Klemkow <j.klemkow@wemelug.de>
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+ * Copyright (c) 2020 Jochen Sprickerhof <git@jochen.sprickerhof.de>
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+ *
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+ * Permission to use, copy, modify, and distribute this software for any
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+ * purpose with or without fee is hereby granted, provided that the above
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+ * copyright notice and this permission notice appear in all copies.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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+ */
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+
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/select.h>
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Jan Klemkow