usr/src/uts/common/sys/poll.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  23 /*        All Rights Reserved   */
  24
  25
  26 /*
  27  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
  28  *
  29  * Copyright (c) 1995, 1998 by Sun Microsystems, Inc.
  30  * All rights reserved.
  31  */
  32
  33 /*
  34  * Copyright 2015, Joyent, Inc.
  35  */
  36
  37 #ifndef _SYS_POLL_H
  38 #define _SYS_POLL_H
  39
  40 #ifdef  __cplusplus
  41 extern "C" {
  42 #endif
  43
  44 /*
  45  * Structure of file descriptor/event pairs supplied in
  46  * the poll arrays.
  47  */
  48 typedef struct pollfd {
  49         int fd;                         /* file desc to poll */
  50         short events;                   /* events of interest on fd */
  51         short revents;                  /* events that occurred on fd */
  52 } pollfd_t;
  53
  54 typedef unsigned long   nfds_t;
  55
  56 /*
  57  * Testable select events
  58  */
  59 #define POLLIN          0x0001          /* fd is readable */
  60 #define POLLPRI         0x0002          /* high priority info at fd */
  61 #define POLLOUT         0x0004          /* fd is writeable (won't block) */
  62 #define POLLRDNORM      0x0040          /* normal data is readable */
  63 #define POLLWRNORM      POLLOUT
  64 #define POLLRDBAND      0x0080          /* out-of-band data is readable */
  65 #define POLLWRBAND      0x0100          /* out-of-band data is writeable */
  66 #define POLLRDHUP       0x4000          /* read-side hangup */
  67
  68 #define POLLNORM        POLLRDNORM
  69
  70 /*
  71  * Non-testable poll events (may not be specified in events field,
  72  * but may be returned in revents field).
  73  */
  74 #define POLLERR         0x0008          /* fd has error condition */
  75 #define POLLHUP         0x0010          /* fd has been hung up on */
  76 #define POLLNVAL        0x0020          /* invalid pollfd entry */
  77
  78 /*
  79  * These events will never be specified in revents, but may be specified in
  80  * events to control /dev/poll behavior.
  81  */
  82 #define POLLREMOVE      0x0800          /* remove cached /dev/poll fd */
  83 #define POLLONESHOT     0x1000          /* /dev/poll should one-shot this fd */
  84 #define POLLET          0x2000          /* edge-triggered /dev/poll fd */
  85
  86 #ifdef _KERNEL
  87
  88 /*
  89  * Additional private poll flags supported only by strpoll().
  90  * Must be bit-wise distinct from the above POLL flags.
  91  */
  92 #define POLLRDDATA      0x0200  /* Wait for M_DATA; ignore M_PROTO only msgs */
  93 #define POLLNOERR       0x0400  /* Ignore POLLERR conditions */
  94
  95 #define POLLCLOSED      0x8000  /* a (cached) poll fd has been closed */
  96
  97 #endif /* _KERNEL */
  98
  99 #if defined(_KERNEL) || defined(_KMEMUSER)
 100
 101 #include <sys/thread.h>
 102
 103 /*
 104  * XXX We are forced to use a forward reference here because including
 105  * file.h here will break i386 build. The real solution is to fix the
 106  * broken parts in usr/src/stand/lib/fs.
 107  */
 108 struct fpollinfo;
 109
 110 /*
 111  * Poll list head structure.  A pointer to this is passed to
 112  * pollwakeup() from the caller indicating an event has occurred.
 113  * Only the ph_list field is used, but for DDI compliance, we can't
 114  * change the size of the structure.
 115  */
 116 typedef struct pollhead {
 117         struct polldat          *ph_list;       /* list of pollers */
 118         void                    *ph_pad1;       /* unused -- see above */
 119         short                   ph_pad2;        /* unused -- see above */
 120 } pollhead_t;
 121
 122 #if defined(_KERNEL)
 123
 124 /*
 125  * Routine called to notify a process of the occurrence
 126  * of an event.
 127  */
 128 extern void pollwakeup(pollhead_t *, short);
 129
 130 /*
 131  * Internal routines.
 132  */
 133 extern int polllock(pollhead_t *, kmutex_t *);
 134 extern int pollunlock(int *);
 135 extern void pollrelock(int);
 136 extern void pollcleanup(void);
 137 extern void pollblockexit(struct fpollinfo *);
 138 extern void pollcacheclean(struct fpollinfo *, int);
 139
 140 /*
 141  * public poll head interface:
 142  *
 143  *  pollhead_clean      clean up all polldats on a pollhead list
 144  */
 145 extern void pollhead_clean(pollhead_t *);
 146
 147 #endif /* defined(_KERNEL) */
 148
 149 #endif /* defined(_KERNEL) || defined(_KMEMUSER) */
 150
 151 #if !defined(_KERNEL)
 152 int poll(struct pollfd *, nfds_t, int);
 153 #endif /* !_KERNEL */
 154
 155 #ifdef  __cplusplus
 156 }
 157 #endif
 158
 159 #endif  /* _SYS_POLL_H */