Function updateMaxclients

app/redis-6.2.6/src/config.c:2297–2323

}

static int updateMaxclients(long long val, long long prev, const char **err) {
    /* Try to check if the OS is capable of supporting so many FDs. */
    if (val > prev) {
        adjustOpenFilesLimit();
        if (server.maxclients != val) {
            static char msg[128];
            sprintf(msg, "The operating system is not able to handle the specified number of clients, try with %d", server.maxclients);
            *err = msg;
            if (server.maxclients > prev) {
                server.maxclients = prev;
                adjustOpenFilesLimit();
            }
            return 0;
        }
        if ((unsigned int) aeGetSetSize(server.el) <
            server.maxclients + CONFIG_FDSET_INCR)
        {
            if (aeResizeSetSize(server.el,
                server.maxclients + CONFIG_FDSET_INCR) == AE_ERR)
            {
                *err = "The event loop API used by Redis is not able to handle the specified number of clients";
                return 0;
            }
        }
    }
    return 1;
}

static int updateOOMScoreAdj(int val, int prev, const char **err) {
    UNUSED(prev);