poll.h

7号信令功能代码,为开源代码

/*                               -*- Mode: C -*- 
 * <strpoll> --- poll
 * Author          : gram & nemo
 * Created On      : Mon Oct 17 11:37:12 1994
 * RCS Id          ; poll.h,v 1.1.1.1 2002/06/04 16:39:25 brian Exp
 * Last Modified By: David Grothe
 * Last Modified On: 
 * Update Count    : 6
 * Status          : Debugged
 * Prefix(es)      : 
 * Requirements    :
 * Purpose         :
 *                 :
 *    Copyright (C) 1995  Graham Wheeler, Francisco J. Ballesteros
 *    Copyright (C) 1997  David Grothe, Gcom, Inc <[e-mail]>
 *
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Cambridge,
 * MA 02139, USA.
 * 
 *
 *    You can reach us by email to any of
 *    [e-mail], [e-mail]
 */

#ifndef _SYS_POLL_H
#define	_SYS_POLL_H

#ident "@(#) LiS poll.h 2.5 6/4/02 16:39:25 "

/*  -------------------------------------------------------------------  */


#if defined(__linux__)
/*
 * The strategy here is that if we are compiling for a 2.1 or 2.2 kernel
 * we want to use the kernel's poll.h.  Otherwise we will use the poll.h
 * that comes with LiS.  "Otherwise" also includes the use of LiS as a
 * portable STREAMS with no kernel poll.h to be included.
 */
# if !defined(_LIS_M_DEP_H) || !defined(__KERNEL__)
# ifndef USER		/* Nonsense, and error if no linux/version.h */
#  include <linux/version.h>
#  ifndef KERNEL_VERSION
#  define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
#  endif
#  if LINUX_VERSION_CODE < KERNEL_VERSION(2,1,0)
#   define	KERNEL_2_0
#  else
#   define	KERNEL_2_1
#  endif
# endif				/* USER */
# endif				/* _LIS_M_DEP_H */
#endif				/* __linux__ */

/*
 * KERNEL_2_1 defined only if __linux__ is also defined.
 */
#if defined(KERNEL_2_1)		/* 2.1 kernel uses Linux's poll.h */
#define USED_LINUX_POLL_H	1
#include <linux/poll.h>		/* instead of the rest of this file */
#  if defined(_SPARC_LIS_) && !defined(POLLMSG)
#    define POLLMSG         0x0200  /* supply missing def for SPARC */
#  endif
#else				/* use LiS's poll.h */
				/* include the rest of this file */
#define USED_LIS_POLL_H	1
#ifndef _POLL_H
#include <sys/LiS/poll.h>	/* streams module symbols & types */
#endif

/*  -------------------------------------------------------------------  */
/*
 * Structure of file descriptor/event pairs supplied in
 * the poll arrays.
 *
 * Magic Garden calls this "struct pollfd", AT&T STREAMS Programers Guide
 * calls it "struct poll".
 */
typedef struct poll {
	int fd;				/* file desc to poll */
	short events;			/* events of interest on fd */
	short revents;			/* events that occurred on fd */
} pollfd_t;

struct pollfd {
	int fd;				/* file desc to poll */
	short events;			/* events of interest on fd */
	short revents;			/* events that occurred on fd */
} ;

/*
 * Testable select events
 */
#define	POLLIN		0x0001		/* fd is readable */
#define	POLLPRI		0x0002		/* high priority info at fd */
#define	POLLOUT		0x0004		/* fd is writeable (won't block) */
#define	POLLRDNORM	0x0040		/* normal data is readable */
#define	POLLWRNORM	POLLOUT
#define	POLLRDBAND	0x0080		/* out-of-band data is readable */
#define	POLLWRBAND	0x0100		/* out-of-band data is writeable */
#define	POLLMSG		0x0200		/* M_SIG at head of queue */

#define	POLLNORM	POLLRDNORM

/*
 * Non-testable poll events (may not be specified in events field,
 * but may be returned in revents field).
 */
#define	POLLERR		0x0008		/* fd has error condition */
#define	POLLHUP		0x0010		/* fd has been hung up on */
#define	POLLNVAL	0x0020		/* invalid pollfd entry */

#endif				 /* defined(KERNEL_2_1) */

/*
 * The prototype for the routine called from user programs for the
 * poll system call.
 */
#ifndef poll		/* no macro by that name */

#ifdef __cplusplus
extern "C" {
#endif

extern int poll(struct pollfd *fds, unsigned long nfds, int timeout);

#ifdef __cplusplus
}
#endif

#endif

/*  -------------------------------------------------------------------  */


#endif	/* _SYS_POLL_H */