usr/src/uts/common/sys/devpoll.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 /*
  23  * Copyright (c) 1998 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #ifndef _SYS_DEVPOLL_H
  28 #define _SYS_DEVPOLL_H
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include <sys/poll_impl.h>
  33 #include <sys/types32.h>
  34
  35 #ifdef  __cplusplus
  36 extern "C" {
  37 #endif
  38
  39
  40 /* /dev/poll ioctl */
  41 #define         DPIOC   (0xD0 << 8)
  42 #define DP_POLL         (DPIOC | 1)     /* poll on fds in cached in /dev/poll */
  43 #define DP_ISPOLLED     (DPIOC | 2)     /* is this fd cached in /dev/poll */
  44
  45 #define DEVPOLLSIZE     1000            /* /dev/poll table size increment */
  46
  47 /*
  48  * /dev/poll DP_POLL ioctl format
  49  */
  50 typedef struct dvpoll {
  51         pollfd_t        *dp_fds;        /* pollfd array */
  52         nfds_t          dp_nfds;        /* num of pollfd's in dp_fds[] */
  53         int             dp_timeout;     /* time out in milisec */
  54 } dvpoll_t;
  55
  56 typedef struct dvpoll32 {
  57         caddr32_t       dp_fds;         /* pollfd array */
  58         uint32_t        dp_nfds;        /* num of pollfd's in dp_fds[] */
  59         int32_t         dp_timeout;     /* time out in milisec */
  60 } dvpoll32_t;
  61
  62 #ifdef _KERNEL
  63
  64 typedef struct dp_entry {
  65         kmutex_t        dpe_lock;       /* protect a devpoll entry */
  66         pollcache_t     *dpe_pcache;    /* a ptr to pollcache */
  67         int             dpe_refcnt;     /* no. of ioctl lwp on the dpe */
  68         int             dpe_writerwait; /* no. of waits on write */
  69         int             dpe_flag;       /* see below */
  70         kcondvar_t      dpe_cv;
  71 } dp_entry_t;
  72
  73 #define DP_WRITER_PRESENT       0x1     /* a write is in progress */
  74
  75 #define DP_REFRELE(dpep) {                      \
  76         mutex_enter(&(dpep)->dpe_lock);         \
  77         ASSERT((dpep)->dpe_refcnt > 0);         \
  78         (dpep)->dpe_refcnt--;                   \
  79         if ((dpep)->dpe_refcnt == 0) {          \
  80                 cv_broadcast(&(dpep)->dpe_cv);  \
  81         }                                       \
  82         mutex_exit(&(dpep)->dpe_lock);          \
  83 }
  84 #endif  /* _KERNEL */
  85
  86 #ifdef  __cplusplus
  87 }
  88 #endif
  89
  90 #endif  /* _SYS_DEVPOLL_H */