Function aofReadDiffFromParent

src/aof.cpp:1538–1548

This function is called by the child rewriting the AOF file to read * the difference accumulated from the parent into a buffer, that is * concatenated at the end of the rewrite. */

 * the difference accumulated from the parent into a buffer, that is
 * concatenated at the end of the rewrite. */
ssize_t aofReadDiffFromParent(void) {
    char buf[65536]; /* Default pipe buffer size on most Linux systems. */
    ssize_t nread, total = 0;

    while ((nread =
            read(g_pserver->aof_pipe_read_data_from_parent,buf,sizeof(buf))) > 0) {
        g_pserver->aof_child_diff = sdscatlen(g_pserver->aof_child_diff,buf,nread);
        total += nread;
    }
    return total;
}

int rewriteAppendOnlyFileRio(rio *aof) {
    size_t processed = 0;