Add event I/O abstraction.

 * required to support non-Linux OS e.g. Mac OS X / BSD
 * see Github issue #19

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/nio.h b/nio.h
new file mode 100644
index 000000000..5ee67d883
--- /dev/null
+++ b/nio.h
@@ -0,0 +1,61 @@
+#ifndef NIO_H
+#define NIO_H 1
+
+#include <poll.h>
+
+enum
+{
+    NIO_ERROR_SUCCESS = 0,
+    NIO_ERROR_INTERNAL = 1,
+    NIO_ERROR_SYSTEM = -1
+};
+
+enum
+{
+    NIO_EVENT_INVALID = 0,
+    NIO_EVENT_INPUT = 1,
+    NIO_EVENT_OUTPUT = 2,
+    NIO_EVENT_ERROR = 3,
+};
+
+struct nio
+{
+    int nready;
+
+    nfds_t poll_max_fds;
+    nfds_t poll_cur_fds;
+    struct pollfd * poll_fds;
+    void ** poll_ptrs;
+
+    int epoll_fd;
+    int max_events;
+    void * events;
+};
+
+void nio_init(struct nio * io);
+
+int nio_use_poll(struct nio * io, nfds_t max_fds);
+
+int nio_use_epoll(struct nio * io, int max_events);
+
+int nio_add_fd(struct nio * io, int fd, int event_flags, void * ptr);
+
+int nio_mod_fd(struct nio * io, int fd, int event_flags, void * ptr);
+
+int nio_del_fd(struct nio * io, int fd);
+
+int nio_run(struct nio * io, int timeout);
+
+int nio_check(struct nio * io, int index, int events);
+
+int nio_is_valid(struct nio * io, int index);
+
+int nio_has_input(struct nio * io, int index);
+
+int nio_can_output(struct nio * io, int index);
+
+int nio_has_error(struct nio * io, int index);
+
+void nio_free(struct nio * io);
+
+#endif