src/kits/network/netresolv/isc/eventlib_p.h

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