1 files changed, 46 insertions, 0 deletions

diff --git a/tools/lib/api/fd/array.h b/tools/lib/api/fd/array.h
new file mode 100644
index 000000000000..45db01818f45
--- /dev/null
+++ b/tools/lib/api/fd/array.h
@@ -0,0 +1,46 @@
+#ifndef __API_FD_ARRAY__
+#define __API_FD_ARRAY__
+
+#include <stdio.h>
+
+struct pollfd;
+
+/**
+ * struct fdarray: Array of file descriptors
+ *
+ * @priv: Per array entry priv area, users should access just its contents,
+ *        not set it to anything, as it is kept in synch with @entries, being
+ *        realloc'ed, * for instance, in fdarray__{grow,filter}.
+ *
+ *        I.e. using 'fda->priv[N].idx = * value' where N < fda->nr is ok,
+ *        but doing 'fda->priv = malloc(M)' is not allowed.
+ */
+struct fdarray {
+        int            nr;
+        int            nr_alloc;
+        int            nr_autogrow;
+        struct pollfd *entries;
+        union {
+                int    idx;
+        } *priv;
+};
+
+void fdarray__init(struct fdarray *fda, int nr_autogrow);
+void fdarray__exit(struct fdarray *fda);
+
+struct fdarray *fdarray__new(int nr_alloc, int nr_autogrow);
+void fdarray__delete(struct fdarray *fda);
+
+int fdarray__add(struct fdarray *fda, int fd, short revents);
+int fdarray__poll(struct fdarray *fda, int timeout);
+int fdarray__filter(struct fdarray *fda, short revents,
+                    void (*entry_destructor)(struct fdarray *fda, int fd));
+int fdarray__grow(struct fdarray *fda, int extra);
+int fdarray__fprintf(struct fdarray *fda, FILE *fp);
+
+static inline int fdarray__available_entries(struct fdarray *fda)
+{
+        return fda->nr_alloc - fda->nr;
+}
+
+#endif /* __API_FD_ARRAY__ */