xref: /illumos-gate/usr/src/uts/common/sys/poll.h (revision 8329232e)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved	*/


/*
 * Copyright 2014 Garrett D'Amore <garrett@damore.org>
 *
 * Copyright (c) 1995, 1998 by Sun Microsystems, Inc.
 * All rights reserved.
 */

/*
 * Copyright 2015, Joyent, Inc.
 */

#ifndef _SYS_POLL_H
#define	_SYS_POLL_H

#ifdef	__cplusplus
extern "C" {
#endif

/*
 * Structure of file descriptor/event pairs supplied in
 * the poll arrays.
 */
typedef struct pollfd {
	int fd;				/* file desc to poll */
	short events;			/* events of interest on fd */
	short revents;			/* events that occurred on fd */
} pollfd_t;

typedef unsigned long	nfds_t;

/*
 * 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	POLLRDHUP	0x4000		/* read-side hangup */

#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 */

/*
 * These events will never be specified in revents, but may be specified in
 * events to control /dev/poll behavior.
 */
#define	POLLREMOVE	0x0800		/* remove cached /dev/poll fd */
#define	POLLONESHOT	0x1000		/* /dev/poll should one-shot this fd */
#define	POLLET		0x2000		/* edge-triggered /dev/poll fd */

#ifdef _KERNEL

/*
 * Additional private poll flags supported only by strpoll().
 * Must be bit-wise distinct from the above POLL flags.
 */
#define	POLLRDDATA	0x0200	/* Wait for M_DATA; ignore M_PROTO only msgs */
#define	POLLNOERR	0x0400	/* Ignore POLLERR conditions */

#define	POLLCLOSED	0x8000	/* a (cached) poll fd has been closed */

#endif /* _KERNEL */

#if defined(_KERNEL) || defined(_FAKE_KERNEL) || defined(_KMEMUSER)

#include <sys/thread.h>

/*
 * XXX We are forced to use a forward reference here because including
 * file.h here will break i386 build. The real solution is to fix the
 * broken parts in usr/src/stand/lib/fs.
 */
struct fpollinfo;

/*
 * Poll list head structure.  A pointer to this is passed to
 * pollwakeup() from the caller indicating an event has occurred.
 * Only the ph_list field is used, but for DDI compliance, we can't
 * change the size of the structure.
 */
typedef struct pollhead {
	struct polldat		*ph_list;	/* list of pollers */
	void			*ph_pad1;	/* unused -- see above */
	short			ph_pad2;	/* unused -- see above */
} pollhead_t;

#if defined(_KERNEL)

/*
 * Routine called to notify a process of the occurrence
 * of an event.
 */
extern void pollwakeup(pollhead_t *, short);

/*
 * Internal routines.
 */
extern int polllock(pollhead_t *, kmutex_t *);
extern int pollunlock(int *);
extern void pollrelock(int);
extern void pollcleanup(void);
extern void pollblockexit(struct fpollinfo *);
extern void pollcacheclean(struct fpollinfo *, int);

/*
 * public poll head interface:
 *
 *  pollhead_clean      clean up all polldats on a pollhead list
 */
extern void pollhead_clean(pollhead_t *);

#endif /* defined(_KERNEL) */

#endif /* defined(_KERNEL) || defined(_KMEMUSER) */

#if !defined(_KERNEL)
int poll(struct pollfd *, nfds_t, int);
#endif /* !_KERNEL */

#ifdef	__cplusplus
}
#endif

#endif	/* _SYS_POLL_H */