/* echo-thread.c
 *
 * Copyright (c) 2000 Sean Walton and Macmillan Publishers.  Use may be in
 * whole or in part in accordance to the General Public License (GPL).
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
*/

/*****************************************************************************/
/*** echo-thread.c                                                         ***/
/***                                                                       ***/
/*** An echo server using threads.                                         ***/
/*****************************************************************************/
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <sys/wait.h>
#include <sys/socket.h>
/*#include <resolv.h>*/
#include <arpa/inet.h>
#include <pthread.h>

void PANIC(char* msg);
#define PANIC(msg)  { perror(msg); exit(-1); }

/*--------------------------------------------------------------------*/
/*--- Child - echo servlet                                         ---*/
/*--------------------------------------------------------------------*/
void* Child(void* arg)
{   
  char line[100];
  int bytes_read;
  int client = *(int *)arg;
  
  bzero(line, 100);
  
  /*do
    {*/
  printf("CHILD: Processing request ...\n");
  bytes_read = recv(client, line, sizeof(line), 0);
  send(client, line, bytes_read, 0);
  /*}
    while (strncmp(line, "bye\r", 4) != 0);*/
  printf("CHILD: Sending %s\n", line);
  close(client);
  printf("CHILD: Returning ...\n");
  return arg;
}

/*--------------------------------------------------------------------*/
/*--- main - setup server and await connections (no need to clean  ---*/
/*--- up after terminated children.                                ---*/
/*--------------------------------------------------------------------*/
int main(void)
{   
  int sd;
  struct sockaddr_in addr;
  
  if ( (sd = socket(PF_INET, SOCK_STREAM, 0)) < 0 )
    PANIC("Socket");
  printf("PARENT: socket created\n");
  
  addr.sin_family = AF_INET;
  addr.sin_port = htons(9999);
  addr.sin_addr.s_addr = INADDR_ANY;
  if ( bind(sd, (struct sockaddr*)&addr, sizeof(addr)) != 0 )
    PANIC("Bind");
  printf("PARENT: socket bound\n");
  
  if ( listen(sd, 20) != 0 )
    PANIC("Listen");
  printf("PARENT: listening...\n");
  
  while (1)
    {   int client, addr_size = sizeof(addr);
    pthread_t child;
    
    printf("PARENT: waiting to accept ...\n");
    client = accept(sd, (struct sockaddr*)&addr, &addr_size);
    printf("PARENT: Connected: %s:%d\n", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
    if ( pthread_create(&child, NULL, Child, &client) != 0 )
      {
	perror("Thread creation");
      }
    else
      {
	printf("PARENT: Thread created\n");
	
	pthread_detach(child);  /* disassociate from parent */
	printf("PARENT: Thread detached\n");
      }
    }
  return 0;
}