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75 lines
1.7 KiB
75 lines
1.7 KiB
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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poll.h
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Abstract:
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Contains #defines, types, and macros for poll
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Author:
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Sam Patton (sampa) July 26, 1991
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Revision History:
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--*/
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#ifndef SYS_POLL_INCLUDED
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#define SYS_POLL_INCLUDED
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/*
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* Structure of file descriptor/event pairs supplied in
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* the poll arrays.
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*/
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struct pollfd {
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#ifndef _POSIX_SOURCE
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HANDLE fd; /* file handle to poll */
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#else
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int fd; /* file desc to poll */
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#endif
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short events; /* events of interest on fd */
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short revents; /* events that occurred on fd */
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};
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/*
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* Testable select events
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*/
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#define POLLIN 01 /* fd is readable */
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#define POLLPRI 02 /* priority info at fd */
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#define POLLOUT 04 /* fd is writeable (won't block) */
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#define POLLMSG 0100 /* M_SIG or M_PCSIG arrived */
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/*
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* Non-testable poll events (may not be specified in events field,
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* but may be returned in revents field).
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*/
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#define POLLERR 010 /* fd has error condition */
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#define POLLHUP 020 /* fd has been hung up on */
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#define POLLNVAL 040 /* invalid pollfd entry */
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/*
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* Number of pollfd entries to read in at a time in poll.
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* The larger the value the better the performance, up to the
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* maximum number of open files allowed. Large numbers will
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* use excessive amounts of kernel stack space.
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*/
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#define NPOLLFILE 20
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/*
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* Poll function prototype
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*
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*/
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int
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poll(
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IN OUT struct pollfd *,
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IN unsigned int,
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IN int);
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#endif //SYS_POLL_INCLUDED
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