simple_lpush.c

/*
 * apk add hiredis
 * gcc -o simple-lpush simple_lpush.c -lhiredis
 * ./simple-lpush mylist value
 *
 * On the consumer side:
 * while :; do redis-cli BLPOP mylist 0; done
 */

#include <stdlib.h>
#include <hiredis/hiredis.h>

#define CHECK(X) if ( !X || X->type == REDIS_REPLY_ERROR ) { printf("Error\n"); exit(-1); }

int main (int argc, char *argv[]) {
  redisContext *c;
  redisReply *reply;

  c = redisConnect("localhost", 6379);
  if (c->err) {
    printf("Connection error: %s\n", c->errstr);
    exit(1);
  }

  reply = (redisReply *) redisCommand(c,"LPUSH %s %s", argv[1], argv[2]);
  CHECK(reply);
  freeReplyObject(reply);

  redisFree(c);

  return 0;
}