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ws_select
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The select function determines the status of one or more sockets, waiting if necessary, to perform synchronous I/O.
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| Code examples: |
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| Declaration: |
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int select(
int nfds,
fd_set* readfds,
fd_set* writefds,
fd_set* exceptfds,
const struct timeval* timeout
);
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| FoxPro declaration: |
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DECLARE INTEGER select IN ws2_32 AS ws_select;
INTEGER nfds,;
STRING @ readfds,;
STRING @ writefds,;
STRING @ exceptfds,;
INTEGER timeout
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| Parameters: |
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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.
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| Return value: |
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| 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. |
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| Word Index links for the ws_select : |
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| Created: | 2003-02-05 19:14:03 | | Modified: | 2003-02-05 19:39:35 |
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