rosapps/net/ncftp/sio/SSelect.c

   1 #include "syshdrs.h"
   2
   3 void
   4 SelectSetInit(SelectSetPtr const ssp, const double timeout)
   5 {
   6         double i;
   7         long l;
   8
   9         /* Inititalize SelectSet, which will clear the fd_set, the
  10          * timeval, and the maxfd and numfds to 0.
  11          */
  12         memset(ssp, 0, sizeof(SelectSet));
  13         l = (long) timeout;
  14         i = (double) l;
  15         ssp->timeout.tv_sec = l;
  16         ssp->timeout.tv_usec = (long) ((timeout - i) * 1000000.0);
  17 }       /* SelectSetInit */
  18
  19
  20
  21
  22 void
  23 SelectSetAdd(SelectSetPtr const ssp, const int fd)
  24 {
  25         if (fd >= 0) {
  26                 FD_SET(fd, &ssp->fds);
  27                 if (ssp->maxfd < (fd + 1))
  28                         ssp->maxfd = (fd + 1);
  29                 ++ssp->numfds;
  30         }
  31 }       /* SelectSetAdd */
  32
  33
  34
  35
  36 void
  37 SelectSetRemove(SelectSetPtr const ssp, const int fd)
  38 {
  39         if ((fd >= 0) && (FD_ISSET(fd, &ssp->fds))) {
  40                 FD_CLR(fd, &ssp->fds);
  41                 /* Note that maxfd is left alone, even if maxfd was
  42                  * this one.  That is okay.
  43                  */
  44                 --ssp->numfds;
  45         }
  46 }       /* SelectSetRemove */
  47
  48
  49
  50 int
  51 SelectW(SelectSetPtr ssp, SelectSetPtr resultssp)
  52 {
  53         int rc;
  54
  55         do {
  56                 memcpy(resultssp, ssp, sizeof(SelectSet));
  57                 rc = select(resultssp->maxfd, NULL, SELECT_TYPE_ARG234 &resultssp->fds, NULL, SELECT_TYPE_ARG5 &resultssp->timeout);
  58         } while ((rc < 0) && (errno == EINTR));
  59         return (rc);
  60 }       /* SelectW */
  61
  62
  63
  64 int
  65 SelectR(SelectSetPtr ssp, SelectSetPtr resultssp)
  66 {
  67         int rc;
  68
  69         do {
  70                 memcpy(resultssp, ssp, sizeof(SelectSet));
  71                 rc = select(resultssp->maxfd, SELECT_TYPE_ARG234 &resultssp->fds, NULL, NULL, SELECT_TYPE_ARG5 &resultssp->timeout);
  72         } while ((rc < 0) && (errno == EINTR));
  73         return (rc);
  74 }       /* SelectR */