Function xread

wrapper.c:228–243

* xread() is the same a read(), but it automatically restarts read() * operations with a recoverable error (EAGAIN and EINTR). xread() * DOES NOT GUARANTEE that "len" bytes is read even if the data is available. */

 * DOES NOT GUARANTEE that "len" bytes is read even if the data is available.
 */
ssize_t xread(int fd, void *buf, size_t len)
{
	ssize_t nr;
	if (len > MAX_IO_SIZE)
		len = MAX_IO_SIZE;
	while (1) {
		nr = read(fd, buf, len);
		if (nr < 0) {
			if (errno == EINTR)
				continue;
			if (handle_nonblock(fd, POLLIN, errno))
				continue;
		}
		return nr;
	}
}

/*
 * xwrite() is the same a write(), but it automatically restarts write()