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diff --git a/docs/examples/crypt_log_usage.c b/docs/examples/crypt_log_usage.c
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+/*
+ * libcryptsetup API log example
+ *
+ * Copyright (C) 2011-2023 Red Hat, Inc. All rights reserved.
+ *
+ * This file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <libcryptsetup.h>
+
+/*
+ * This is an example of crypt_set_log_callback API callback.
+ *
+ */
+static void simple_syslog_wrapper(int level, const char *msg, void *usrptr)
+{
+ const char *prefix = (const char *)usrptr;
+ int priority;
+
+ switch(level) {
+ case CRYPT_LOG_NORMAL: priority = LOG_NOTICE; break;
+ case CRYPT_LOG_ERROR: priority = LOG_ERR; break;
+ case CRYPT_LOG_VERBOSE: priority = LOG_INFO; break;
+ case CRYPT_LOG_DEBUG: priority = LOG_DEBUG; break;
+ default:
+ fprintf(stderr, "Unsupported log level requested!\n");
+ return;
+ }
+
+ if (prefix)
+ syslog(priority, "%s:%s", prefix, msg);
+ else
+ syslog(priority, "%s", msg);
+}
+
+int main(void)
+{
+ struct crypt_device *cd;
+ char usrprefix[] = "cslog_example";
+ int r;
+
+ if (geteuid()) {
+ printf("Using of libcryptsetup requires super user privileges.\n");
+ return 1;
+ }
+
+ openlog("cryptsetup", LOG_CONS | LOG_PID, LOG_USER);
+
+ /* Initialize empty crypt device context */
+ r = crypt_init(&cd, NULL);
+ if (r < 0) {
+ printf("crypt_init() failed.\n");
+ return 2;
+ }
+
+ /* crypt_set_log_callback() - register a log callback for crypt context */
+ crypt_set_log_callback(cd, &simple_syslog_wrapper, (void *)usrprefix);
+
+ /* send messages ithrough the crypt_log() interface */
+ crypt_log(cd, CRYPT_LOG_NORMAL, "This is normal log message");
+ crypt_log(cd, CRYPT_LOG_ERROR, "This is error log message");
+ crypt_log(cd, CRYPT_LOG_VERBOSE, "This is verbose log message");
+ crypt_log(cd, CRYPT_LOG_DEBUG, "This is debug message");
+
+ /* release crypt context */
+ crypt_free(cd);
+
+ /* Initialize default (global) log callback */
+ crypt_set_log_callback(NULL, &simple_syslog_wrapper, NULL);
+
+ crypt_log(NULL, CRYPT_LOG_NORMAL, "This is normal log message");
+ crypt_log(NULL, CRYPT_LOG_ERROR, "This is error log message");
+ crypt_log(NULL, CRYPT_LOG_VERBOSE, "This is verbose log message");
+ crypt_log(NULL, CRYPT_LOG_DEBUG, "This is debug message");
+
+ closelog();
+ return 0;
+}