calling a shared object from a daemon Post: 302091869

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Top Forums Programming calling a shared object from a daemon Post 302091869 by axes on Thursday 5th of October 2006 01:20:01 PM

10-05-2006

axes

Guest

Thanks corona 4 ur suggestions. I am little bit confused abt thread creation.

For ur reference I am pasting my daemon template code. Pls embed the new code to establish a TCP connection to vendor server so that I can simulate the same.

Sorry to bother abt my code.

Code:

#define _REENTRANT
----- HEADER FILES -----------
/* the TCP port that I will be listening for my clients*/
#define TCP_PORT   6500
void *process_clnt(void *);
main()
{
   int 	sockfd, newsockfd, clilen;
   struct sockaddr_in cli_addr, serv_addr;
   thread_t chld_thr;

   if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
	fprintf(stderr,"my_daemon: can't open stream socket\n"), exit(0);
   memset((char *) &serv_addr, 0, sizeof(serv_addr));
   serv_addr.sin_family = AF_INET;
   serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
   serv_addr.sin_port = htons(TCP_PORT);	
   if(bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
		fprintf(stderr,"server: can't bind local address\n"), exit(0);
   thr_setconcurrency(5);
   listen(sockfd, NULL);

   for(;;){
	clilen = sizeof(cli_addr);
	newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
	if(newsockfd < 0)
		fprintf(stderr,"server: accept error\n"), exit(0);
	/* create a new thread to process the incomming client request */
	thr_create(NULL, 0, process_clnt, (void *) newsockfd, THR_DETACHED, &chld_thr);
   }
   return(0);
}

void *process_clnt(void *arg)
{
   int 	mysocfd = (int) arg;
   char 	data[100];
   /* read from the given socket */
   read(mysocfd, data, data_size);
   /* DO SOME PROCESSING */

   /* This is the place I want to have a TCP connection to vendor server to get the result */
       ----------------------
       ----------------------
   write(mysockfd,result,result_size); /* send back result to my client */
   close(mysocfd);
   thr_exit((void *)0);
}

Last edited by blowtorch; 10-05-2006 at 02:53 PM.. Reason: add code tags

axes

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LEARN ABOUT DEBIAN

msgcache

MSGCACHE(8)						      System Manager's Manual						       MSGCACHE(8)

NAME

       msgcache - Cache client messages for later pickup by hobbitfetch

SYNOPSIS

       msgcache [options]

DESCRIPTION

       msgcache  implements  a Xymon message cache. It is intended for use with clients which cannot deliver their data to the Xymon server in the
       normal way. Instead of having the client tools connect to the Xymon server, msgcache runs locally and the client tools then  deliver  their
       data to the msgcache daemon. The msgcache daemon is then polled regularly by the hobbitfetch(8) utility, which collects the client messages
       stored by msgcache and forwards them to the Xymon server.

       NOTE: When using msgcache, the BBDISP setting for the clients should be BBDISP=127.0.0.1 instead of pointing at the real Xymon server.

RESTRICTIONS

       Clients delivering their data to msgcache instead of the real Xymon server will in general not notice this. Specifically, the  client  con-
       figuration  data provided by the Xymon server when a client delivers its data is forwarded through the hobbitfetch / msgcache chain, so the
       normal centralized client configuration works.

       However, other commands which rely on clients communicating directly with the Xymon server will not work.  This	includes  the  config  and
       query commands which clients may use to fetch configuration files and query the Xymon server for a current status.

       The download command also does not work with msgcache.  This means that the automatic client update facility will not work for clients com-
       municating via msgcache.

OPTIONS

       --listen=IPADDRESS[:PORT]
	      Defines the IP-address and portnumber where msgcache listens for incoming connections. By default, msgcache listens for  connections
	      on all network interfaces, port 1984.

       --server=IPADDRESS[,IPADDRESS]
	      Restricts  which servers are allowed to pick up the cached messages.  By default anyone can contact the msgcache utility and request
	      all of the cached messages. This option allows only the listed servers to request the cached messages.

       --max-age=N
	      Defines how long cached messages are kept. If the message has not been picked up with N seconds after being delivered  to  msgcache,
	      it is silently discarded. Default: N=600 seconds (10 minutes).

       --daemon
	      Run as a daemon, i.e. msgcache will detach from the terminal and run as a background task

       --no-daemon
	      Run  as  a  foreground task. This option must be used when msgcache is started by hobbitlaunch(8) which is the normal way of running
	      msgcache.

       --pidfile=FILENAME
	      Store the process ID of the msgcache task in FILENAME.

       --logfile=FILENAME
	      Log msgcache output to FILENAME.

       --debug
	      Enable debugging output.

SEE ALSO

       hobbitfetch(8), xymon(7)

Xymon							    Version 4.2.3:  4 Feb 2009						       MSGCACHE(8)

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