lib/libc/isc/eventlib_p.h

   1 /*      $NetBSD: eventlib_p.h,v 1.1.1.4 2009/04/12 16:35:46 christos Exp $      */
   2
   3 /*
   4  * Copyright (c) 2005 by Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (c) 1995-1999 by Internet Software Consortium
   6  *
   7  * Permission to use, copy, modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  12  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  13  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  14  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  15  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  17  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /*! \file
  21  * \brief private interfaces for eventlib
  22  * \author vix 09sep95 [initial]
  23  *
  24  * Id: eventlib_p.h,v 1.9 2006/03/09 23:57:56 marka Exp
  25  */
  26
  27 #ifndef _EVENTLIB_P_H
  28 #define _EVENTLIB_P_H
  29
  30 #include <sys/param.h>
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33 #include <netinet/in.h>
  34 #include <sys/un.h>
  35
  36 #define EVENTLIB_DEBUG 1
  37
  38 #include <errno.h>
  39 #include <fcntl.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43
  44 #include <isc/heap.h>
  45 #include <isc/list.h>
  46 #include <isc/memcluster.h>
  47
  48 #define EV_MASK_ALL     (EV_READ | EV_WRITE | EV_EXCEPT)
  49 #define EV_ERR(e)               return (errno = (e), -1)
  50 #define OK(x)           if ((x) < 0) EV_ERR(errno); else (void)NULL
  51 #define OKFREE(x, y)    if ((x) < 0) { FREE((y)); EV_ERR(errno); } \
  52                         else (void)NULL
  53
  54 #define NEW(p)          if (((p) = memget(sizeof *(p))) != NULL) \
  55                                 FILL(p); \
  56                         else \
  57                                 (void)NULL;
  58 #define OKNEW(p)        if (!((p) = memget(sizeof *(p)))) { \
  59                                 errno = ENOMEM; \
  60                                 return (-1); \
  61                         } else \
  62                                 FILL(p)
  63 #define FREE(p)         memput((p), sizeof *(p))
  64
  65 #if EVENTLIB_DEBUG
  66 #define FILL(p)         memset((p), 0xF5, sizeof *(p))
  67 #else
  68 #define FILL(p)
  69 #endif
  70
  71 #ifdef USE_POLL
  72 #ifdef HAVE_STROPTS_H
  73 #include <stropts.h>
  74 #endif
  75 #include <poll.h>
  76 #endif /* USE_POLL */
  77
  78 typedef struct evConn {
  79         evConnFunc      func;
  80         void *          uap;
  81         int             fd;
  82         int             flags;
  83 #define EV_CONN_LISTEN          0x0001          /*%< Connection is a listener. */
  84 #define EV_CONN_SELECTED        0x0002          /*%< evSelectFD(conn->file). */
  85 #define EV_CONN_BLOCK           0x0004          /*%< Listener fd was blocking. */
  86         evFileID        file;
  87         struct evConn * prev;
  88         struct evConn * next;
  89 } evConn;
  90
  91 typedef struct evAccept {
  92         int             fd;
  93         union {
  94                 struct sockaddr         sa;
  95                 struct sockaddr_in      in;
  96 #ifndef NO_SOCKADDR_UN
  97                 struct sockaddr_un      un;
  98 #endif
  99         }               la;
 100         ISC_SOCKLEN_T   lalen;
 101         union {
 102                 struct sockaddr         sa;
 103                 struct sockaddr_in      in;
 104 #ifndef NO_SOCKADDR_UN
 105                 struct sockaddr_un      un;
 106 #endif
 107         }               ra;
 108         ISC_SOCKLEN_T   ralen;
 109         int             ioErrno;
 110         evConn *        conn;
 111         LINK(struct evAccept) link;
 112 } evAccept;
 113
 114 typedef struct evFile {
 115         evFileFunc      func;
 116         void *          uap;
 117         int             fd;
 118         int             eventmask;
 119         int             preemptive;
 120         struct evFile * prev;
 121         struct evFile * next;
 122         struct evFile * fdprev;
 123         struct evFile * fdnext;
 124 } evFile;
 125
 126 typedef struct evStream {
 127         evStreamFunc    func;
 128         void *          uap;
 129         evFileID        file;
 130         evTimerID       timer;
 131         int             flags;
 132 #define EV_STR_TIMEROK  0x0001  /*%< IFF timer valid. */
 133         int             fd;
 134         struct iovec *  iovOrig;
 135         int             iovOrigCount;
 136         struct iovec *  iovCur;
 137         int             iovCurCount;
 138         int             ioTotal;
 139         int             ioDone;
 140         int             ioErrno;
 141         struct evStream *prevDone, *nextDone;
 142         struct evStream *prev, *next;
 143 } evStream;
 144
 145 typedef struct evTimer {
 146         evTimerFunc     func;
 147         void *          uap;
 148         struct timespec due, inter;
 149         int             index;
 150         int             mode;
 151 #define EV_TMR_RATE     1
 152 } evTimer;
 153
 154 typedef struct evWait {
 155         evWaitFunc      func;
 156         void *          uap;
 157         const void *    tag;
 158         struct evWait * next;
 159 } evWait;
 160
 161 typedef struct evWaitList {
 162         evWait *                first;
 163         evWait *                last;
 164         struct evWaitList *     prev;
 165         struct evWaitList *     next;
 166 } evWaitList;
 167
 168 typedef struct evEvent_p {
 169         enum {  Accept, File, Stream, Timer, Wait, Free, Null  } type;
 170         union {
 171                 struct {  evAccept *this;  }                    accept;
 172                 struct {  evFile *this; int eventmask;  }       file;
 173                 struct {  evStream *this;  }                    stream;
 174                 struct {  evTimer *this;  }                     timer;
 175                 struct {  evWait *this;  }                      wait;
 176                 struct {  struct evEvent_p *next;  }            free;
 177                 struct {  const void *placeholder;  }           null;
 178         } u;
 179 } evEvent_p;
 180
 181 #ifdef USE_POLL
 182 typedef struct {
 183         void            *ctx;   /* pointer to the evContext_p   */
 184         uint32_t        type;   /* READ, WRITE, EXCEPT, nonblk  */
 185         uint32_t        result; /* 1 => revents, 0 => events    */
 186 } __evEmulMask;
 187
 188 #define emulMaskInit(ctx, field, ev, lastnext) \
 189         ctx->field.ctx = ctx; \
 190         ctx->field.type = ev; \
 191         ctx->field.result = lastnext;
 192
 193 extern short    *__fd_eventfield(int fd, __evEmulMask *maskp);
 194 extern short    __poll_event(__evEmulMask *maskp);
 195 extern void             __fd_clr(int fd, __evEmulMask *maskp);
 196 extern void             __fd_set(int fd, __evEmulMask *maskp);
 197
 198 #undef  FD_ZERO
 199 #define FD_ZERO(maskp)
 200
 201 #undef  FD_SET
 202 #define FD_SET(fd, maskp) \
 203         __fd_set(fd, maskp)
 204
 205 #undef  FD_CLR
 206 #define FD_CLR(fd, maskp) \
 207         __fd_clr(fd, maskp)
 208
 209 #undef  FD_ISSET
 210 #define FD_ISSET(fd, maskp) \
 211         ((*__fd_eventfield(fd, maskp) & __poll_event(maskp)) != 0)
 212
 213 #endif /* USE_POLL */
 214
 215 typedef struct {
 216         /* Global. */
 217         const evEvent_p *cur;
 218         /* Debugging. */
 219         int             debug;
 220         FILE            *output;
 221         /* Connections. */
 222         evConn          *conns;
 223         LIST(evAccept)  accepts;
 224         /* Files. */
 225         evFile          *files, *fdNext;
 226 #ifndef USE_POLL
 227         fd_set          rdLast, rdNext;
 228         fd_set          wrLast, wrNext;
 229         fd_set          exLast, exNext;
 230         fd_set          nonblockBefore;
 231         int             fdMax, fdCount, highestFD;
 232         evFile          *fdTable[FD_SETSIZE];
 233 #else
 234         struct pollfd   *pollfds;       /* Allocated as needed  */
 235         evFile          **fdTable;      /* Ditto                */
 236         int             maxnfds;        /* # elements in above  */
 237         int             firstfd;        /* First active fd      */
 238         int             fdMax;          /* Last active fd       */
 239         int             fdCount;        /* # fd:s with I/O      */
 240         int             highestFD;      /* max fd allowed by OS */
 241         __evEmulMask    rdLast, rdNext;
 242         __evEmulMask    wrLast, wrNext;
 243         __evEmulMask    exLast, exNext;
 244         __evEmulMask    nonblockBefore;
 245 #endif /* USE_POLL */
 246 #ifdef EVENTLIB_TIME_CHECKS
 247         struct timespec lastSelectTime;
 248         int             lastFdCount;
 249 #endif
 250         /* Streams. */
 251         evStream        *streams;
 252         evStream        *strDone, *strLast;
 253         /* Timers. */
 254         struct timespec lastEventTime;
 255         heap_context    timers;
 256         /* Waits. */
 257         evWaitList      *waitLists;
 258         evWaitList      waitDone;
 259 } evContext_p;
 260
 261 /* eventlib.c */
 262 #define evPrintf __evPrintf
 263 void evPrintf(const evContext_p *ctx, int level, const char *fmt, ...)
 264      ISC_FORMAT_PRINTF(3, 4);
 265
 266 #ifdef USE_POLL
 267 extern int evPollfdRealloc(evContext_p *ctx, int pollfd_chunk_size, int fd);
 268 #endif /* USE_POLL */
 269
 270 /* ev_timers.c */
 271 #define evCreateTimers __evCreateTimers
 272 heap_context evCreateTimers(const evContext_p *);
 273 #define evDestroyTimers __evDestroyTimers
 274 void evDestroyTimers(const evContext_p *);
 275
 276 /* ev_waits.c */
 277 #define evFreeWait __evFreeWait
 278 evWait *evFreeWait(evContext_p *ctx, evWait *old);
 279
 280 /* Global options */
 281 extern int      __evOptMonoTime;
 282
 283 #endif /*_EVENTLIB_P_H*/