training_repo/Non_Blocking_socket/client.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <errno.h>

#define PORT 8081

#define SERVER_IP "127.0.0.1"

int main() {
    int sockfd;
    struct sockaddr_in server_address;

    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("Socket creation failed");
        exit(EXIT_FAILURE);
    }
    printf("enter into program\n");

    int flags = fcntl(sockfd, F_GETFL, 0);
    fcntl(sockfd, F_SETFL, flags | O_NONBLOCK);


    server_address.sin_family = AF_INET;
    server_address.sin_port = htons(PORT);
    inet_pton(AF_INET, SERVER_IP, &server_address.sin_addr);

    int connect_status;
label:
    connect_status = connect(sockfd, (struct sockaddr *)&server_address, sizeof(server_address));


    if (connect_status == 0) {
        printf("conncetion succcessfully\n");
         while(1)
            {
                char s[20];
                printf("enter the data two send\n");

                scanf("%s",s);
                send(sockfd,s,strlen(s),0);
            }

    }
    else
    {

    while (1) {

        printf("still trying to connect\n");

        sleep(1);

        goto label;
    }
    }

    close(sockfd);
    return 0;
}