pwrite pread need check EINTR?

like  the following snippet: 
 n = pwrite(fd, slab, size, off);
    if (n < size) {
        log_error("pwrite fd %d %zu bytes at offset %"PRId64" failed: %s",
                  fd, size, off, strerror(errno));
        return FC_ERROR;
    }

when n<size ,pread or pwrite may interrupt by signal ,errno is equal to EINTR,
it should process on writing,not return an error?
