listati/FullRead.c

   1 #include <unistd.h>
   2
   3 ssize_t FullRead(int fd, void *buf, size_t count)
   4 {
   5     size_t nleft;
   6     ssize_t nread;
   7
   8     nleft = count;
   9     while (nleft > 0) {             /* repeat until no left */
  10         if ( (nread = read(fd, buf, nleft)) < 0) {
  11             if (errno == EINTR) {   /* if interrupted by system call */
  12                 continue;           /* repeat the loop */
  13             } else {
  14                 return(nread);      /* otherwise exit */
  15             }
  16         } else if (nread == 0) {    /* EOF */
  17             break;                  /* break loop here */
  18         }
  19         nleft -= nread;             /* set left to read */
  20         buf +=nread;                /* set pointer */
  21     }
  22     return (count - nleft);
  23 }