Function openChildInfoPipe

src/childinfo.cpp:44–55

Open a child-parent channel used in order to move information about the * RDB / AOF saving process from the child to the parent (for instance * the amount of copy on write memory used) */

 * RDB / AOF saving process from the child to the parent (for instance
 * the amount of copy on write memory used) */
void openChildInfoPipe(void) {
    serverAssert(g_pserver->child_info_pipe[0] == -1);
    if (pipe(g_pserver->child_info_pipe) == -1) {
        /* On error our two file descriptors should be still set to -1,
         * but we call anyway closeChildInfoPipe() since can't hurt. */
        closeChildInfoPipe();
    } else if (anetNonBlock(NULL,g_pserver->child_info_pipe[0]) != ANET_OK) {
        closeChildInfoPipe();
    } else {
        g_pserver->child_info_nread = 0;
    }
}

/* Close the pipes opened with openChildInfoPipe(). */
void closeChildInfoPipe(void) {