len = MAX_IO_SIZE;
while (1) {
nr = read(fd, buf, len);
- if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
- continue;
+ if (nr < 0) {
+ if (errno == EINTR)
+ continue;
+ if (errno == EAGAIN || errno == EWOULDBLOCK) {
+ struct pollfd pfd;
+ pfd.events = POLLIN;
+ pfd.fd = fd;
+ /*
+ * it is OK if this poll() failed; we
+ * want to leave this infinite loop
+ * only when read() returns with
+ * success, or an expected failure,
+ * which would be checked by the next
+ * call to read(2).
+ */
+ poll(&pfd, 1, -1);
+ }
+ }
return nr;
}
}