program automatically closing after writing to socket

I have the following code:

  bytes_read = read(0, buffer_stdin, 65535);
  printf("bytes read from stdin: %d\n", bytes_read);
  bytes_written = write(sock, buffer_stdin, bytes_read);
  printf("bytes written to socket: %d\n", bytes_written); 

sock is the socket descriptor. In the code I have connected the socket to a server and the connection returned (0), indicating the connection was successful.

Now in the code above I type something into stdin, let's say "hello" and the number of bytes read would be 6 (because of null termination after letter 'o'). The program executes the first print statement.

But for some reason the program doesn't execute the second print statement. It just exits.

When I commented out line 3 where I write to the socket, the 2nd print statement executes.

My question is, why is the program exiting early without my instruction to do so?

Here is the preliminary code:

int main(int argc, char *argv[]) {
  if (argc != 3) {
    printf("Invalid arguments\n");
    exit(1);
  }

  char *serverIP = argv[1]; /*Server hostname*/
  char *portNumber = argv[2]; /*Port Number*/
  void *numericAddress;
  char buffer_stdin[65535];
  char buffer_stdout[65535];
  int bytes_read = 0;
  int bytes_written = 0;

  /*getting integral number of string representation of port number*/
  in_port_t servPort = atoi(argv[2]);

  /*------------------get binary number of hostname-----------------*/
  struct addrinfo addrCriteria;
  memset(&addrCriteria, 0, sizeof(addrCriteria));
  addrCriteria.ai_family = AF_INET;
  addrCriteria.ai_socktype = SOCK_STREAM;
  addrCriteria.ai_protocol = IPPROTO_TCP;

  struct addrinfo *addrList;

  int rtnVal = getaddrinfo(serverIP, portNumber, &addrCriteria, &addrList);
  if (rtnVal != 0) {
    printf("getaddrinfo() failed\n");
    exit(1);
  }
  if (rtnVal == 0) {
    printf("getaddrinfo() successful\n");
  }

  numericAddress = &((struct sockaddr_in *) (addrList->ai_addr))->sin_addr;
  ((struct sockaddr_in *)(addrList->ai_addr))->sin_port = htons(servPort);
  /*----------------------------------------------------------------*/

  /*Creating socket*/
  int sock = socket(AF_INET,SOCK_STREAM, IPPROTO_TCP);
  if (sock < 0) {
    printf("error creating socket\n");
    exit(1);
  }

  /*Establish connection to the echo server*/
  int r = connect(sock, (struct sockaddr *) addrList, sizeof(addrList));
  if (r < 0) {
    printf("Connection failed\n");
    exit(1);
  }
  if (r == 0) {
    printf("connection succesful\n");
  }