136 lines
3.7 KiB
C
Executable File
136 lines
3.7 KiB
C
Executable File
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#ifndef _SYS_POLL_H
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#define _SYS_POLL_H
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#pragma ident "@(#)poll.h 1.19 94/08/31 SMI" /* SVr4.0 11.9 */
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#ifdef __cplusplus
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extern "C" {
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#endif
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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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typedef struct pollfd {
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int fd; /* file desc to poll */
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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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} pollfd_t;
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/*
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* Testable select events
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*/
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#define POLLIN 0x0001 /* fd is readable */
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#define POLLPRI 0x0002 /* high priority info at fd */
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#define POLLOUT 0x0004 /* fd is writeable (won't block) */
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#define POLLRDNORM 0x0040 /* normal data is readable */
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#define POLLWRNORM POLLOUT
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#define POLLRDBAND 0x0080 /* out-of-band data is readable */
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#define POLLWRBAND 0x0100 /* out-of-band data is writeable */
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#define POLLNORM POLLRDNORM
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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 0x0008 /* fd has error condition */
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#define POLLHUP 0x0010 /* fd has been hung up on */
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#define POLLNVAL 0x0020 /* invalid pollfd entry */
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#if defined(_KERNEL) || defined(_KMEMUSER)
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#include <sys/t_lock.h>
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#include <sys/thread.h>
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/*
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* Poll list head structure. A pointer to this is passed to
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* pollwakeup() from the caller indicating an event has occurred.
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* Only the ph_list field is used, but for DDI compliance, we can't
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* change the size of the structure.
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*/
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typedef struct pollhead {
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struct polldat *ph_list; /* list of pollers */
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struct polldat *ph_dummy; /* unused -- see above */
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short ph_events; /* unused -- see above */
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} pollhead_t;
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/*
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* Data necessary to notify process sleeping in poll(2)
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* when an event has occurred.
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*/
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typedef struct polldat {
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kthread_t *pd_thread; /* thread doing poll */
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int pd_events; /* events being polled */
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struct polldat *pd_next; /* next in poll list */
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struct polldat *pd_prev; /* previous in poll list */
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struct pollhead *pd_headp; /* backpointer to head of list */
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struct pollhead *pd_sphp; /* stored pollhead struct pointer */
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} polldat_t;
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/*
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* State information kept by each polling thread
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*/
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typedef struct pollstate {
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int ps_nfds;
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int ps_flag;
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pollfd_t *ps_pollfd;
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polldat_t *ps_polldat;
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kmutex_t ps_lock; /* mutex for the polling thread */
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kmutex_t ps_no_exit; /* protects ps_busy*, can't be nested */
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int ps_busy; /* can only exit when its 0 */
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kcondvar_t ps_busy_cv; /* cv to wait on if ps_busy != 0 */
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kcondvar_t ps_cv; /* cv to wait on if needed */
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} pollstate_t;
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/* ps_flag */
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#define T_POLLTIME 0x01 /* poll timeout pending */
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#define T_POLLWAKE 0x02 /* pollwakeup() occurred */
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#if defined(_KERNEL)
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/*
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* Routine called to notify a process of the occurrence
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* of an event.
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*/
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extern void pollwakeup(pollhead_t *, short);
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/*
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* pollwakeup_safe will replace pollwakeup when the support
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* for unsafe drivers is removed.
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*/
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extern void pollwakeup_safe(pollhead_t *, short);
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/*
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* Internal routines.
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*/
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extern void polltime(kthread_t *);
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extern void pollrun(kthread_t *);
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extern void polldel(pollstate_t *);
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extern void pplock_init(void);
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extern void pplock(pollhead_t *);
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extern void ppunlock(pollhead_t *);
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extern int pplockowned(pollhead_t *);
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extern void ppwaitemptylist(pollhead_t *);
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#endif /* defined(_KERNEL) */
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#endif /* defined(_KERNEL) || defined(_KMEMUSER) */
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#if defined(__STDC__) && !defined(_KERNEL)
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int poll(struct pollfd *, unsigned long, int);
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_POLL_H */
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