diff --git a/include/sudo_iolog.h b/include/sudo_iolog.h
index d4b4c71b3..b49ed29f3 100644
--- a/include/sudo_iolog.h
+++ b/include/sudo_iolog.h
@@ -106,13 +106,12 @@ struct iolog_path_escape {
 char *expand_iolog_path(const char *prefix, const char *dir, const char *file, char **slashp, const struct iolog_path_escape *escapes, void *closure);
 
 /* iolog_util.c */
-/* XXX - prefix these */
-bool parse_timing(const char *line, struct timing_closure *timing);
-char *parse_delay(const char *cp, struct timespec *delay, const char *decimal_point);
-int read_timing_record(struct iolog_file *iol, struct timing_closure *timing);
-struct iolog_info *parse_logfile(FILE *fp, const char *iolog_dir);
-void adjust_delay(struct timespec *delay, struct timespec *max_delay, double scale_factor);
-void free_iolog_info(struct iolog_info *li);
+bool iolog_parse_timing(const char *line, struct timing_closure *timing);
+char *iolog_parse_delay(const char *cp, struct timespec *delay, const char *decimal_point);
+int iolog_read_timing_record(struct iolog_file *iol, struct timing_closure *timing);
+struct iolog_info *iolog_parse_loginfo(FILE *fp, const char *iolog_dir);
+void iolog_adjust_delay(struct timespec *delay, struct timespec *max_delay, double scale_factor);
+void iolog_free_loginfo(struct iolog_info *li);
 
 /* iolog_fileio.c */
 struct passwd;
diff --git a/lib/iolog/iolog_util.c b/lib/iolog/iolog_util.c
index 7a9265626..daa37736c 100644
--- a/lib/iolog/iolog_util.c
+++ b/lib/iolog/iolog_util.c
@@ -61,16 +61,16 @@
 static int timing_event_adj;
 
 struct iolog_info *
-parse_logfile(FILE *fp, const char *logfile)
+iolog_parse_loginfo(FILE *fp, const char *logfile)
 {
     char *buf = NULL, *cp, *ep;
     const char *errstr;
     size_t bufsize = 0, cwdsize = 0, cmdsize = 0;
     struct iolog_info *li = NULL;
-    debug_decl(parse_logfile, SUDO_DEBUG_UTIL)
+    debug_decl(iolog_parse_loginfo, SUDO_DEBUG_UTIL)
 
     /*
-     * ID file has three lines:
+     * Info file has three lines:
      *  1) a log info line
      *  2) cwd
      *  3) command with args
@@ -172,16 +172,16 @@ parse_logfile(FILE *fp, const char *logfile)
 
 bad:
     free(buf);
-    free_iolog_info(li);
+    iolog_free_loginfo(li);
     debug_return_ptr(NULL);
 }
 
 void
-adjust_delay(struct timespec *delay, struct timespec *max_delay,
+iolog_adjust_delay(struct timespec *delay, struct timespec *max_delay,
      double scale_factor)
 {
     double seconds;
-    debug_decl(adjust_delay, SUDO_DEBUG_UTIL)
+    debug_decl(iolog_adjust_delay, SUDO_DEBUG_UTIL)
 
     if (scale_factor != 1.0) {
 	/* Order is important: we don't want to double the remainder. */
@@ -212,13 +212,14 @@ adjust_delay(struct timespec *delay, struct timespec *max_delay,
  * in the C locale this may not match the current locale.
  */
 char *
-parse_delay(const char *cp, struct timespec *delay, const char *decimal_point)
+iolog_parse_delay(const char *cp, struct timespec *delay,
+    const char *decimal_point)
 {
     char numbuf[(((sizeof(long long) * 8) + 2) / 3) + 2];
     const char *errstr, *ep;
     long long llval;
     size_t len;
-    debug_decl(parse_delay, SUDO_DEBUG_UTIL)
+    debug_decl(iolog_parse_delay, SUDO_DEBUG_UTIL)
 
     /* Parse seconds (whole number portion). */
     for (ep = cp; isdigit((unsigned char)*ep); ep++)
@@ -295,11 +296,11 @@ parse_delay(const char *cp, struct timespec *delay, const char *decimal_point)
  * Returns true on success and false on failure.
  */
 bool
-parse_timing(const char *line, struct timing_closure *timing)
+iolog_parse_timing(const char *line, struct timing_closure *timing)
 {
     unsigned long ulval;
     char *cp, *ep;
-    debug_decl(parse_timing, SUDO_DEBUG_UTIL)
+    debug_decl(iolog_parse_timing, SUDO_DEBUG_UTIL)
 
     /* Clear iolog descriptor. */
     timing->iol = NULL;
@@ -319,7 +320,7 @@ parse_timing(const char *line, struct timing_closure *timing)
 	continue;
 
     /* Parse delay, returns the next field or NULL on error. */
-    if ((cp = parse_delay(cp, &timing->delay, timing->decimal)) == NULL)
+    if ((cp = iolog_parse_delay(cp, &timing->delay, timing->decimal)) == NULL)
 	goto bad;
 
     switch (timing->event) {
@@ -367,11 +368,11 @@ bad:
  * Return 0 on success, 1 on EOF and -1 on error.
  */
 int
-read_timing_record(struct iolog_file *iol, struct timing_closure *timing)
+iolog_read_timing_record(struct iolog_file *iol, struct timing_closure *timing)
 {
     char line[LINE_MAX];
     const char *errstr;
-    debug_decl(read_timing_record, SUDO_DEBUG_UTIL)
+    debug_decl(iolog_read_timing_record, SUDO_DEBUG_UTIL)
 
     /* Read next record from timing file. */
     if (iolog_gets(iol, line, sizeof(line), &errstr) == NULL) {
@@ -384,7 +385,7 @@ read_timing_record(struct iolog_file *iol, struct timing_closure *timing)
 
     /* Parse timing file record. */
     line[strcspn(line, "\n")] = '\0';
-    if (!parse_timing(line, timing)) {
+    if (!iolog_parse_timing(line, timing)) {
 	sudo_warnx(U_("invalid timing file line: %s"), line);
 	debug_return_int(-1);
     }
@@ -393,7 +394,7 @@ read_timing_record(struct iolog_file *iol, struct timing_closure *timing)
 }
 
 void
-free_iolog_info(struct iolog_info *li)
+iolog_free_loginfo(struct iolog_info *li)
 {
     if (li != NULL) {
 	free(li->cwd);
diff --git a/lib/iolog/regress/iolog_util/check_iolog_util.c b/lib/iolog/regress/iolog_util/check_iolog_util.c
index 6021fa8d9..f72657f5e 100644
--- a/lib/iolog/regress/iolog_util/check_iolog_util.c
+++ b/lib/iolog/regress/iolog_util/check_iolog_util.c
@@ -53,7 +53,7 @@ static struct parse_delay_test {
 };
 
 /*
- * Test parse_delay()
+ * Test iolog_parse_delay()
  */
 void
 test_parse_delay(int *ntests, int *nerrors)
@@ -63,7 +63,7 @@ test_parse_delay(int *ntests, int *nerrors)
     for (i = 0; i < nitems(parse_delay_tests); i++) {
 	struct timespec delay;
 	struct parse_delay_test *test = &parse_delay_tests[i];
-	char *cp = parse_delay(test->input, &delay, ".");
+	char *cp = iolog_parse_delay(test->input, &delay, ".");
 	if (cp == NULL) {
 	    sudo_warnx("%s:%u failed to parse delay: %s", __func__,
 		i, test->input);
@@ -110,7 +110,7 @@ static struct adjust_delay_test {
 };
 
 /*
- * Test adjust_delay()
+ * Test iolog_adjust_delay()
  */
 void
 test_adjust_delay(int *ntests, int *nerrors)
@@ -120,8 +120,9 @@ test_adjust_delay(int *ntests, int *nerrors)
     for (i = 0; i < nitems(adjust_delay_tests); i++) {
 	struct adjust_delay_test *test = &adjust_delay_tests[i];
 
-	adjust_delay(&test->in_delay, sudo_timespecisset(&test->max_delay) ?
-	    &test->max_delay : NULL, test->scale_factor);
+	iolog_adjust_delay(&test->in_delay,
+	    sudo_timespecisset(&test->max_delay) ? &test->max_delay : NULL,
+	    test->scale_factor);
 	if (!sudo_timespeccmp(&test->in_delay, &test->out_delay, ==)) {
 	    sudo_warnx("%s:%u want {%lld, %ld}, got {%lld, %ld}", __func__, i,
 		(long long)test->out_delay.tv_sec, test->out_delay.tv_nsec,
diff --git a/logsrvd/iolog_writer.c b/logsrvd/iolog_writer.c
index 3ea8d8beb..b10717d60 100644
--- a/logsrvd/iolog_writer.c
+++ b/logsrvd/iolog_writer.c
@@ -670,7 +670,7 @@ iolog_rewrite(const struct timespec *target, struct connection_closure *closure)
     /* TODO: use iolog_seekto with a callback? */
     for (;;) {
 	/* Read next record from timing file. */
-	if (read_timing_record(&closure->iolog_files[IOFD_TIMING], &timing) != 0)
+	if (iolog_read_timing_record(&closure->iolog_files[IOFD_TIMING], &timing) != 0)
 	    goto done;
 	sudo_timespecadd(&timing.delay, &closure->elapsed_time,
 	    &closure->elapsed_time);
diff --git a/logsrvd/logsrv_util.c b/logsrvd/logsrv_util.c
index 4fc9f8a0b..806c5c40a 100644
--- a/logsrvd/logsrv_util.c
+++ b/logsrvd/logsrv_util.c
@@ -141,7 +141,7 @@ iolog_seekto(int iolog_dir_fd, const char *iolog_path,
 
     /* Parse timing file until we reach the target point. */
     for (;;) {
-	if (read_timing_record(&iolog_files[IOFD_TIMING], &timing) != 0)
+	if (iolog_read_timing_record(&iolog_files[IOFD_TIMING], &timing) != 0)
 	    goto bad;
 	sudo_timespecadd(&timing.delay, elapsed_time, elapsed_time);
 	if (timing.event < IOFD_TIMING) {
diff --git a/logsrvd/sendlog.c b/logsrvd/sendlog.c
index f496741a7..605b0eb4d 100644
--- a/logsrvd/sendlog.c
+++ b/logsrvd/sendlog.c
@@ -622,7 +622,7 @@ fmt_next_iolog(struct client_closure *closure)
 
     /* TODO: fill write buffer with multiple messages */
 again:
-    switch (read_timing_record(&iolog_files[IOFD_TIMING], timing)) {
+    switch (iolog_read_timing_record(&iolog_files[IOFD_TIMING], timing)) {
     case 0:
 	/* OK */
 	break;
@@ -1045,7 +1045,7 @@ iolog_seekto(int iolog_dir_fd, const char *iolog_path,
 
     /* Parse timing file until we reach the target point. */
     for (;;) {
-	if (read_timing_record(&iolog_files[IOFD_TIMING], &timing) != 0)
+	if (iolog_read_timing_record(&iolog_files[IOFD_TIMING], &timing) != 0)
 	    goto bad;
 	sudo_timespecadd(&timing.delay, elapsed_time, elapsed_time);
 	if (timing.event < IOFD_TIMING) {
@@ -1223,7 +1223,7 @@ main(int argc, char *argv[])
 	sudo_warn("%s/log", iolog_dir);
 	goto bad;
     }
-    if ((log_info = parse_logfile(fp, iolog_dir)) == NULL)
+    if ((log_info = iolog_parse_loginfo(fp, iolog_dir)) == NULL)
 	goto bad;
 
     /* Open the I/O log files and seek to restart point if there is one. */
diff --git a/plugins/sudoers/regress/iolog_plugin/check_iolog_plugin.c b/plugins/sudoers/regress/iolog_plugin/check_iolog_plugin.c
index 9a336b8b8..bb44b159e 100644
--- a/plugins/sudoers/regress/iolog_plugin/check_iolog_plugin.c
+++ b/plugins/sudoers/regress/iolog_plugin/check_iolog_plugin.c
@@ -95,7 +95,7 @@ validate_iolog_info(const char *logfile)
 	sudo_warn("%s", logfile);
 	return false;
     }
-    info = parse_logfile(fp, logfile);
+    info = iolog_parse_loginfo(fp, logfile);
     fclose(fp);
     if (info == NULL)
 	return false;
@@ -146,7 +146,7 @@ validate_iolog_info(const char *logfile)
 	return false;
     }
 
-    free_iolog_info(info);
+    iolog_free_loginfo(info);
 
     return true;
 }
@@ -162,7 +162,7 @@ validate_timing(FILE *fp, int recno, int type, unsigned int p1, unsigned int p2)
 	return false;
     }
     buf[strcspn(buf, "\n")] = '\0';
-    if (!parse_timing(buf, &timing)) {
+    if (!iolog_parse_timing(buf, &timing)) {
 	sudo_warnx("invalid timing file line: %s", buf);
 	return false;
     }
diff --git a/plugins/sudoers/sudoreplay.c b/plugins/sudoers/sudoreplay.c
index 6b3f0f3c5..bfabe00e9 100644
--- a/plugins/sudoers/sudoreplay.c
+++ b/plugins/sudoers/sudoreplay.c
@@ -366,7 +366,7 @@ main(int argc, char *argv[])
     fd = openat(iolog_dir_fd, "log", O_RDONLY, 0);
     if (fd == -1 || (fp = fdopen(fd, "r")) == NULL)
 	sudo_fatal(U_("unable to open %s/%s"), iolog_dir, "log");
-    if ((li = parse_logfile(fp, iolog_dir)) == NULL)
+    if ((li = iolog_parse_loginfo(fp, iolog_dir)) == NULL)
 	goto done;
     fclose(fp);
     printf(_("Replaying sudo session: %s"), li->cmd);
@@ -379,7 +379,7 @@ main(int argc, char *argv[])
     putchar('\n');
 
     /* Done with parsed log file. */
-    free_iolog_info(li);
+    iolog_free_loginfo(li);
     li = NULL;
 
     /* Replay session corresponding to iolog_files[]. */
@@ -735,7 +735,7 @@ get_timing_record(struct replay_closure *closure)
     int ret;
     debug_decl(get_timing_record, SUDO_DEBUG_UTIL)
 
-    if ((ret = read_timing_record(&iolog_files[IOFD_TIMING], timing)) != 0)
+    if ((ret = iolog_read_timing_record(&iolog_files[IOFD_TIMING], timing)) != 0)
 	debug_return_int(ret);
 
     /* Record number bytes to read. */
@@ -748,7 +748,7 @@ get_timing_record(struct replay_closure *closure)
     }
 
     /* Adjust delay using speed factor and max_delay. */
-    adjust_delay(&timing->delay, closure->max_delay, speed_factor);
+    iolog_adjust_delay(&timing->delay, closure->max_delay, speed_factor);
 
     /* Schedule the delay event. */
     if (sudo_ev_add(closure->evbase, closure->delay_ev, &timing->delay, false) == -1)
@@ -1319,7 +1319,7 @@ list_session(char *logfile, regex_t *re, const char *user, const char *tty)
 	sudo_warn("%s", logfile);
 	goto done;
     }
-    if ((li = parse_logfile(fp, logfile)) == NULL)
+    if ((li = iolog_parse_loginfo(fp, logfile)) == NULL)
 	goto done;
 
     /* Match on search expression if there is one. */
@@ -1356,7 +1356,7 @@ list_session(char *logfile, regex_t *re, const char *user, const char *tty)
 done:
     if (fp != NULL)
 	fclose(fp);
-    free_iolog_info(li);
+    iolog_free_loginfo(li);
     debug_return_int(ret);
 }