C socket successfully accept() but fails on recv() - c

Question

I am trying to implement a server which accepts 2 connections one after another each of them sending data. My client-side can connect and fwrite successfully whereas my server-side connects successfully but fails to recv() anything. I have tried many things on the net but I could not resolve this. Why would recv() fail in this code after succesfully accepting and connecting on the socket?
Code of Server part —— Successful on accept() but fail on recv()
char** get_host_ip(){
char** arr = malloc(3* sizeof(char*));
int x;
for(x=0; x<3;x++){
arr[x] = malloc(256 *sizeof(char));
}
int socket_desc , client_sock , c , *new_sock;
struct sockaddr_in server , client;
fd_set fdset;
struct timeval tv;
//Create socket
socket_desc = socket(AF_INET , SOCK_STREAM , 0);
//fcntl(socket_desc, F_SETFL, O_NONBLOCK);
if (socket_desc == -1)
{
printf("Could not create socket");
}
puts("Socket created");
//Prepare the sockaddr_in structure
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_ANY;
server.sin_port = htons( 8888 );
int reuse = 1;
if (setsockopt(socket_desc, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(int)) < 0){
perror("setsockopt(SO_REUSEADDR) failed");
}
if(setsockopt(socket_desc, SOL_SOCKET, SO_REUSEPORT, &reuse, sizeof(int)) < 0){
perror("setsockopt(SO_REUSEPORT) failed");
}
//Bind
if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0)
{
//print the error message
perror("bind failed. Error");
char* err = "Error on binding\r\n";
printf("%s\r\n",err);
}
puts("bind done");
//Listen
listen(socket_desc , 20);
//Accept and incoming connection
puts("Waiting for incoming connections...");
c = sizeof(struct sockaddr_in);
int k;
for(k=0; k<2; k++){
client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c);
if(client_sock < 0){
puts("Accept failed\r\n");
exit(0);
}
else{
puts("Accept succeeded");
}
if(k == 0) {
char* host_ip = inet_ntoa(client.sin_addr);
printf("IP address is: %s\n", inet_ntoa(client.sin_addr));
printf("port is: %d\n", (int) ntohs(client.sin_port));
strcpy(arr[k],host_ip);
int read_size = 0;
char readBuf[256];
if((read_size = recv(client_sock , readBuf , 256 , 0)) > 0){
printf("readBuf: %s\r\n",readBuf);
strcpy(arr[k+1],readBuf);
memset(readBuf,0,256);
}
else{
printf("Receive has failed.. read_size: %d\r\n",read_size);
}
}
else {
int read_size;
char readBuf[256];
if((read_size = recv(client_sock , readBuf , 256 , 0)) > 0){
printf("readBuf: %s\r\n",readBuf);
strcpy(arr[k+2],readBuf);
memset(readBuf,0,256);
}
else{
printf("Receive has failed.. read_size: %d\r\n",read_size);
}
}
}
close(client_sock);
close(socket_desc);
return arr;
}
Client part —— connect() and fwrite() successful
void give_envi(char* env_var) {
printf("The environment variable sent: %s\r\n",env_var);
int receive_no = 1;
int sock;
struct sockaddr_in server;
//Create socket
sock = socket(AF_INET , SOCK_STREAM , 0);
if (sock == -1)
{
printf("Could not create socket");
}
//puts("Socket created");
//char host_ip[20];
//strcpy(host_ip,getenv("HOST_IP"));
server.sin_addr.s_addr = inet_addr("127.0.0.1"); //PROVIDE THE IP OF THE TARGET TO SEND YOUR DATA.
server.sin_family = AF_INET;
server.sin_port = htons( 8888 );
int reuse = 1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(int)) < 0){
perror("setsockopt(SO_REUSEADDR) failed");
}
if(setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &reuse, sizeof(int)) < 0){
perror("setsockopt(SO_REUSEPORT) failed");
}
//Connect to remote server
if ( connect(sock , (struct sockaddr *)&server , sizeof(server)) > -1) {
puts("Connection established!\r\n");
}
else{
puts("Connection failed\r\n");
}
FILE * file = fdopen(sock, "w");
if(fwrite (env_var ,sizeof(char), strlen(env_var), file) == strlen(env_var)){
printf("fwrite() SUCCESS\r\n");
}
else{
printf("FAILED on fwrite()\r\n");
}
close(sock);
}