1 files changed, 28 insertions, 0 deletions
diff --git a/include/watcher.h b/include/watcher.h
new file mode 100644
index 0000000..ff31809
--- /dev/null
+++ b/include/watcher.h
@@ -0,0 +1,28 @@
+#ifndef WATCHER_H
+#define WATCHER_H
+
+#include <poll.h>
+#include <stdbool.h>
+
+#include "block.h"
+#include "main.h"
+
+enum watcher_fd_index {
+    SIGNAL_FD = BLOCK_COUNT,
+    WATCHER_FD_COUNT,
+};
+
+typedef struct pollfd watcher_fd;
+
+typedef struct {
+    watcher_fd fds[WATCHER_FD_COUNT];
+    unsigned short active_blocks[BLOCK_COUNT];
+    unsigned short active_block_count;
+    bool got_signal;
+} watcher;
+
+int watcher_init(watcher *const watcher, const block *const blocks,
+                 const unsigned short block_count, const int signal_fd);
+int watcher_poll(watcher *const watcher, const int timeout_ms);
+
+#endif  // WATCHER_H