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while(1)
{
ret = read(fd, buf, len);
if(ret == -1)
{
if(errno == EINTR)
continue;
perror("read");
break;
}
len -= ret;
buf += ret;
if(len == 0 || ret == 0)
{
break;
}
}
ssize_t /* Read "n" bytes from a descriptor */
readn(int fd, void *ptr, size_t n)
{
size_t nleft;
ssize_t nread;
nleft = n;
while (nleft > 0) {
if ((nread = read(fd, ptr, nleft)) < 0) {
if (nleft == n)
return(-1); /* error, return -1 */
else
break; /* error, return amount read so far */
} else if (nread == 0) {
break; /* EOF */
}
nleft -= nread;
ptr += nread;
}
return(n - nleft); /* return >= 0 */
}