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ws_select.md

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Function name : ws_select

Group: Windows Sockets 2 (Winsock) - Library: ws2_32

The select function determines the status of one or more sockets, waiting if necessary, to perform synchronous I/O.

Declaration:

int select(
  int nfds,
  fd_set* readfds,
  fd_set* writefds,
  fd_set* exceptfds,
  const struct timeval* timeout
);

FoxPro declaration:

DECLARE INTEGER select IN ws2_32 AS ws_select;
	INTEGER   nfds,;
	STRING  @ readfds,;
	STRING  @ writefds,;
	STRING  @ exceptfds,;
	INTEGER   timeout

Parameters:

nfds [in] Ignored. The nfds parameter is included only for compatibility with Berkeley sockets.

readfds [in, out] Optional pointer to a set of sockets to be checked for readability.

writefds [in, out] Optional pointer to a set of sockets to be checked for writability

exceptfds [in, out] Optional pointer to a set of sockets to be checked for errors.

timeout [in] Maximum time for select to wait, provided in the form of a TIMEVAL structure.

Return value:

The select function returns the total number of socket handles that are ready and contained in the fd_set structures, zero if the time limit expired, or SOCKET_ERROR if an error occurred.