SOCU:poll

Request

Index Word	Description
0	Header code [0x00140084]
1	nfds_t nfds
2	int timeout
3	Value 0x20 (processID header)
4	ProcessID set by the ARM11 kernel.
5	(insize<<14) | 0x2802
6	Pointer to input pollfd struct array

The following is located 0x100-bytes after the beginning of the above command buffer:

Index Word	Description
0	(outsize<<14) | 2
1	Pointer to output pollfd struct array

Response

Index Word	Description
0	Header code
1	Result code
2	POSIX return value

pollfd struct

Type	Name	Description
u32	fd	Socket handle
u32	events	Events to poll for (input)
u32	revents	Events received (output)

Events

Events are a bitwise set of these flags.

Value	Name	Input/Output	Description
0x01	POLLIN	Both	Can recv() data from socket without blocking. For listen sockets, this means you can accept() a connection without blocking.
0x02	POLLPRI	Both	There is OOB data ready to recv(). Appears that recv()'ing without OOB flag still reads OOB data?
0x04	???	???	Have never seen this flag. Could possibly be POLLHUP (need to test).
0x08	???	???	This flag is almost always set when requested.
0x10	POLLOUT	Both	Can send() data to socket without blocking. For a non-blocking connect(), this means the connection has completed (need to test).
0x20	POLLNVAL	Out	Invalid socket handle. This is set if you use fd=-1, which is non-standard behavior.
???	POLLERR	Out	Socket error.
???	POLLHUP	Out	Socket has been disconnected.