.IP
This function sets the value of \fBkey\fR for \fBtrack\fR to
\fBvalue\fR.
-On success, 0 is returned; on error, -1 is returned.
+On success, 0 is returned; on error, \-1 is returned.
.IP
If \fBvalue\fR is a null pointer then the preference is deleted.
.IP
.fi
.IP
Check whether file \fBpath\fR under \fBroot\fR still exists.
-Should return 1 if it exists, 0 if it does not and -1 on error.
+Should return 1 if it exists, 0 if it does not and \-1 on error.
This is run in the main server process.
.PP
Both scan and recheck are executed inside a subprocess, so it will not
server.
.IP
On success, should return 0 and set \fB*playedp\fR to the number of
-seconds played so far of this track, or to -1 if this cannot be
+seconds played so far of this track, or to \-1 if this cannot be
determined.
.IP
-On error, should return -1.
+On error, should return \-1.
.PP
.nf
\fBvoid disorder_play_resume(void *data);