034b.c

/*
..........................................................................................................................................
Name : 034b.c
Author : SHRUTI VERMA
Description : Write a program to create a concurrent server.
                a. use fork
                b. use pthread_create
Date : 30 Sep 2025
..........................................................................................................................................
*/

#include<unistd.h>
#include<stdlib.h>
#include<stdio.h>
#include<sys/socket.h>
#include<fcntl.h>
#include<netinet/in.h>
#include<pthread.h>

void* handleClient(void* arg) {
    int newsockfd = *(int*)arg;
    free(arg);

    char buffer[1024];
    read(newsockfd, buffer, sizeof(buffer));
    printf("Client says - %s\n", buffer);
    write(newsockfd, "Hello from server!", 19);
    close(newsockfd);
    return NULL;

}

int main() {
    int sockfd, newsockfd;

    //create socket
    sockfd = socket(AF_INET, SOCK_STREAM, 0);

    //bind to IP/Port
    struct sockaddr_in saddr, caddr;
    saddr.sin_family = AF_INET;
    saddr.sin_addr.s_addr = INADDR_ANY;
    saddr.sin_port = htons(8080); 
    bind(sockfd, (struct sockaddr*)&saddr, sizeof(saddr));

    //listen for connections on socket
    listen(sockfd, 5);

    while(1) {
        //accept client on newsocket
        socklen_t clen;
        clen = sizeof(caddr);
        int *newsockfd = malloc(sizeof(int));
        *newsockfd = accept(sockfd, (struct sockaddr*)&caddr, &clen);


        pthread_t tid;
        pthread_create(&tid, NULL, handleClient, newsockfd);
        pthread_detach(tid);  
    }
    
    //close 
    close(sockfd);
    
}

/*------------------------------------OUTPUT------------------------------------
vumma@vumma-VivoBook-15-ASUS-Laptop-X507UF:~/Desktop/SS/HOL2$ ./34b
Client says - Hello Server!!
Client says - Hello Server!!

terminal 2
vumma@vumma-VivoBook-15-ASUS-Laptop-X507UF:~/Desktop/SS/HOL2$ ./client
Server says : Hello from server!
vumma@vumma-VivoBook-15-ASUS-Laptop-X507UF:~/Desktop/SS/HOL2$ 
vumma@vumma-VivoBook-15-ASUS-Laptop-X507UF:~/Desktop/SS/HOL2$ ./client
Server says : Hello from server!

*/