Add TODO markers as part of looking at supporting multiple "-d" options (#12).

src/include/pv-internal.h

@@ -175,6 +175,7 @@ struct pvstate_s {
 		off_t rate_limit;                /* rate limit, in bytes per second */
 		size_t target_buffer_size;       /* buffer size (0=default) */
 		off_t size;                      /* total size of data */
+		/* TODO: replace watch_pid, watch_fd with an array of structs (#12) */
 		pid_t watch_pid;		 /* process to watch fds of */
 		unsigned int skip_errors;        /* skip read errors counter */
 		int watch_fd;			 /* fd to watch */

src/pv/watchpid.c

@@ -449,6 +449,11 @@ int pv_watchpid_scanfds(pvstate_t state,
 			continue;
 #endif
 
+		/*
+		 * TODO: determine whether fd_to_idx really helps here,
+		 * since it constrains us to fds < FD_SETSIZE.
+		 */
+
 		/* Skip if the fd is outside the array. */
 		if ((fd < 0) || (fd >= FD_SETSIZE))
 			continue;