how to reduce the waiting time for connection?

simple script for connect server:

#include "hiredis.h"
int main(void) {
    int fd;

    unsigned int j;
    redisReply *reply;
    reply = redisConnect(&fd, "test.com", 6379);

    if (reply != NULL) {
      开发者_StackOverflow社区  printf("Connection error: %s", reply->reply);
        exit(1);
    }

    reply = redisCommand(fd,"PING");
    printf("PONG: %s\n", reply->reply);
    freeReplyObject(reply);
}

if the server is available - everything is normal. If not - there is a long pause. How to reduce the waiting time to 2 seconds for example ?

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i don't know much about redis. but I assume, the redisConnect internally is basically also just calling connect() on an blocking fd.

so try setting the timeout beforehand using setsockopt:

struct timeval timeout;
timeout.tv_usec = 0;
timeout.tv_sec = 2;
setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, (void *)&timeout, sizeof(timeout));

this sets the send timout to 2 sec, for the receive, you basically do the same.

cheers,

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You'll need to modify the hiredis library, and the anetTcpGenericConnect function to make connect timeout aware. There's an example here of how to do it.