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