TCP

gistfile1.c

int read_msg_from_socket(int sock_fd,struct sm_msg *msg){
    char   buffer[sizeof(struct sm_msg)] = {};
    size_t buffer_len = 0;
    int    nbytes     = 0;
    if( NULL == msg ){
        return -1;
    }

    do{
        nbytes = recv(sock_fd,buffer + buffer_len,sizeof(struct sm_msg) - buffer_len,MSG_WAITALL);
        if( nbytes > 0 ){
            buffer_len += nbytes;
        }
        #ifdef DEBUG
        printf("Bytes receved -> %d , need more bytes %d \n",nbytes,(int)sizeof(struct sm_msg)-(int)buffer_len);
        #endif
        
    }while( buffer_len < sizeof(struct sm_msg));

    sm_cast_mem_to_msg(buffer,sizeof(struct sm_msg),msg);
    return nbytes;
}