Segmentation fault

[cprogczar]

Hi Guys... I am trying to run client server program, but the server program is giving me problem... after the client connects to it.. it says segmentation fault and exits.. i am relatively new to this.. so please bare with me.. i have done lot of research on net, could not find anything that was useful to me... please bail me out!!!!! :-(

Server program

Code:

#include<stdio.h>
#include<string.h>
#include<sys/types.h> 
#include<errno.h>
#include<sys/socket.h> 
#include<netdb.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<stdlib.h>
#include<unistd.h>

#define PORT 6090


int main()
{
       int client_lenght;
       struct sockaddr_in client,server;
       struct hostent *ptrh;
       int sd,sd2;
       char message[50];
       int len;
       memset((char *)&server,0,sizeof(server));
       server.sin_family=AF_INET;
       server.sin_addr.s_addr=INADDR_ANY;
       server.sin_port = htons(PORT);
       sd = socket(AF_INET,SOCK_STREAM,0);
       if(sd<0)
      {
          fprintf(stderr,"cannot create socket\n");
          exit(1);
       }

      if(bind(sd,(struct sockaddr *)&server, sizeof(server))<0)
      {
         fprintf(stderr,"bind failed\n");
         exit(1);
       }

       listen(sd,5);
      while(1)
     {
       len = sizeof(client);

       if((sd2=accept(sd,(struct sockaddr *)&client, &len))<0)
              {
                   fprintf(stderr,"Accept failed\n");
                   exit(1);
              }

       printf("Waiting for message from client\n");
       recv(sd2,message,sizeof(message),0);
       printf("Meesage is %s\n",message);
       close(sd2);
     }
    return 0;
}

Client Program

Code:

#include<stdio.h>
#include<string.h>
#include<sys/types.h> 
#include<errno.h>
#include<sys/socket.h> 
#include<netdb.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<stdlib.h>
#include<unistd.h>

#define PORT 6090

int main()
{
     int client_lenght;
     struct sockaddr_in client,server;
     struct hostent *ptrh;
     int sd;
    char message[50];
    memset((char *)&server,0,sizeof(server));
    memset((char *)&client,0,sizeof(client));
    server.sin_family = AF_INET;


/*
ptrh = gethostbyname(host);
if(((char *)ptrh)==NULL)
{
fprintf(stderr,"invalid host: %s\n", host);
exit(1);
}
memcpy(&server.sin_addr,ptrh->h_addr,ptrh->h_length);*/

       server.sin_addr.s_addr=INADDR_ANY;
       server.sin_port		= htons(PORT);
       if ((sd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
	{
		fprintf(stderr,"Cannot create socket\n");
		exit(1);
	}
        if(connect(sd,(struct sockaddr *)&server, sizeof(server))<0)
        {
           fprintf(stderr, "connect failed\n");
           exit(1);
       }
	printf("Enter the message to be sent to server: ");
	scanf("%s",&message);

        send(sd, message,50,0);
	fflush(stdout);

	/* Closing the socket*/	
	close(sd);
}

Any help is appreciated........

[quzah]

1 - You didn't need to start a new thread for the same topic.
2 - Does the server segfault when it's run alone? (It doesn't for me.)
3 - If it's not segfaulting alone, then it's when it's getting a message or connection, so there's your direction of where to start looking.

You need to learn to troubleshoot problems. Take the first step --- does it happen here? No? Ok, what's the next thing that happens in the program? Does it happen there? Repeat until you find out where it's crashing.


Quzah.

[cprogczar]

Quzah.... Thank you...

seg fault was because of one of the options i missed out in comand line...
doing,
gcc -o server server.c -lsocket -lnsl
./server

works fine...