libpurple/protocols/zephyr/ZWait4Not.c

   1 /* This file is part of the Project Athena Zephyr Notification System.
   2  * It contains the ZCheckIfNotice/select loop used for waiting for
   3  * a notice, with a timeout.
   4  *
   5  *      Copyright (c) 1991 by the Massachusetts Institute of Technology.
   6  *      For copying and distribution information, see the file
   7  *      "mit-copyright.h".
   8  */
   9
  10 #include "internal.h"
  11
  12 #ifdef WIN32
  13 #include <winsock2.h>
  14
  15 #ifndef ZEPHYR_USES_KERBEROS
  16 static int  gettimeofday(struct timeval* tv, struct timezone* tz){
  17      union {
  18      long long ns100; /*time since 1 Jan 1601 in 100ns units */
  19        FILETIME ft;
  20      } _now;
  21
  22      GetSystemTimeAsFileTime( &(_now.ft) );
  23      tv->tv_usec=(long)((_now.ns100 / 10LL) % 1000000LL );
  24      tv->tv_sec= (long)((_now.ns100-(116444736000000000LL))/10000000LL);
  25      return 0;
  26    }
  27 #endif
  28
  29 #else
  30 #include <sys/socket.h>
  31 #endif
  32
  33 Code_t Z_WaitForNotice (notice, pred, arg, timeout)
  34      ZNotice_t *notice;
  35      int (*pred)(ZNotice_t *, void *);
  36      void *arg;
  37      int timeout;
  38 {
  39   Code_t retval;
  40   struct timeval tv, t0;
  41   fd_set fdmask;
  42   int i, fd;
  43
  44   retval = ZCheckIfNotice (notice, (struct sockaddr_in *) 0, pred,
  45                            (char *) arg);
  46   if (retval == ZERR_NONE)
  47     return ZERR_NONE;
  48   if (retval != ZERR_NONOTICE)
  49     return retval;
  50
  51   fd = ZGetFD ();
  52   FD_ZERO (&fdmask);
  53   tv.tv_sec = timeout;
  54   tv.tv_usec = 0;
  55   gettimeofday (&t0, (struct timezone *)NULL);
  56   t0.tv_sec += timeout;
  57   while (1) {
  58     FD_SET (fd, &fdmask);
  59     i = select (fd + 1, &fdmask, (fd_set *) 0, (fd_set *) 0, &tv);
  60     if (i == 0)
  61       return ETIMEDOUT;
  62     if (i < 0 && errno != EINTR)
  63       return errno;
  64     if (i > 0) {
  65       retval = ZCheckIfNotice (notice, (struct sockaddr_in *) 0, pred,
  66                                (char *) arg);
  67       if (retval != ZERR_NONOTICE) /* includes ZERR_NONE */
  68         return retval;
  69     }
  70     gettimeofday (&tv, (struct timezone *) NULL);
  71     tv.tv_usec = t0.tv_usec - tv.tv_usec;
  72     if (tv.tv_usec < 0) {
  73       tv.tv_usec += 1000000;
  74       tv.tv_sec = t0.tv_sec - tv.tv_sec - 1;
  75     }
  76     else
  77       tv.tv_sec = t0.tv_sec - tv.tv_sec;
  78   }
  79   /*NOTREACHED*/
  80 }