readn.h File Reference

00051 {
00052   int nleft, nread;
00053   char *ptr;
00054   double int_part;
00055   struct timeval timeout_tv;
00056   fd_set read_fd_set;
00057   timeout_tv.tv_sec = (long) _timeout;
00058   timeout_tv.tv_usec = (long) (_timeout * 1000000.0);
00059   if (timeout_tv.tv_usec >= 1000000)
00060     {
00061       timeout_tv.tv_usec = timeout_tv.tv_usec % 1000000;
00062     }
00063   FD_ZERO (&read_fd_set);
00064   RCS_FD_SET (fd, &read_fd_set);
00065 
00066 
00067   ptr = (char *) vptr;
00068   nleft = n;
00069   while (nleft > 0)
00070     {
00071       if (_timeout > 0.0)
00072         {
00073           switch (dl_select
00074                   (fd + 1, &read_fd_set, (fd_set *) NULL, (fd_set *) NULL,
00075                    &timeout_tv))
00076             {
00077             case -1:
00078               rcs_print_error ("Error in select: %d -> %s\n", errno,
00079                                strerror (errno));
00080               return -1;
00081 
00082             case 0:
00083               rcs_print_error ("Read timed out.\n");
00084               return -1;
00085 
00086             default:
00087               break;
00088             }
00089         }
00090       if ((nread = read (fd, ptr, nleft)) == -1)
00091         {
00092           rcs_print_error ("Read error: %d = %s\n", errno, strerror (errno));
00093           return (-1);          /* error, return < 0 */
00094         }
00095       else if (nread == 0)
00096         {
00097           rcs_print_error ("readn: Premature EOF recieved.\n");
00098           return (-1);
00099         }
00100 
00101       nleft -= nread;
00102       ptr += nread;
00103     }
00104   return (n - nleft);           /* return >= 0 */
00105 }
readn.h File Reference

Functions

Function Documentation

Functions
int	readn (int fd, void *vptr, int n, double timeout)