sockets( ) programming

im tring to make a connection to a port and im tring to send some data to and then recv it but.. i dont fully understand sockets yet.. anyhelp

Code:

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

#define MYPORT 3490
#define ALLOW 10

static void
   BAIL( const char *on_what )
   {
      fputs( strerror( errno), stderr );
      fputs( on_what, stderr );
      exit(1);
   }

int main( int argc, char **argv )
{

  struct sockaddr_in mysock;
  struct sockaddr_in their_addr;
  char *msg = "xlordt was here";
  int s_sock;
  int b_bind;
  int c_connet;
  int s_listen;
  int a_accept, r_recv;
  int size, len, bsent;

  s_sock = socket( AF_INET, SOCK_STREAM, 0 );
  
  if( s_sock == -1 )
  {
     BAIL( "error on: socket( )\n" );
  }

  printf( "Status on socket( ): OK!\n" );

  mysock.sin_family = AF_INET;
  mysock.sin_port = htons( MYPORT );
  mysock.sin_addr.s_addr = inet_addr( "127.0.0.1" );

  memset( &mysock, 0, sizeof mysock );

  b_bind = bind( s_sock,( struct sockaddr *)&mysock,sizeof( struct sockaddr ));

  if( b_bind == -1 )
  {
     BAIL( "error on: bind( )\n" );
  }

  printf( "Status on bind( ): OK!\n" );

  c_connet = connect( s_sock,( struct sockaddr *)&mysock,sizeof( struct sockaddr ));
  
  if( c_connet == -1 )
  {
    BAIL( "error on: connect( )\n" );
  }

  printf( "Status on connect( ): OK!\n" );

  s_listen = listen( s_sock, ALLOW );

  if( s_listen == -1 )
  {
    BAIL( "error on: listen( )\n" );
  }

  printf( "Status on listen: OK!\n" );
  size = sizeof( struct sockaddr_in );

  a_accept = accept( s_sock,( struct sockaddr *)&their_addr,&size );

  if( a_accept == -1 )
  {
    BAIL( "error on: accept( )\n" );
  }

  printf( "Status on accept: OK!\n" );
  
  len = strlen( msg );
  bsent = send( s_sock, msg, len, 0 );

  if( bsent == -1 )
  {
    BAIL( "error on: send( )\n" );
  }
  
  r_recv = recv( s_sock, msg, len, 0 );
  printf( "%s", r_recv );

  return 0;

}

>> memset( &mysock, 0, sizeof mysock );

You just erased what you put *in* the structure.

>> connect...

Figure out what you're trying to do here - server or client??

Server does:

socket()
bind()
loop:
listen()
accept()
loop:
recv()
send()

Client:

socket()
connect()
loop:
send()
recv()

Notice that a server start communicating with a recv(), while the client starts with a send().

Next, when your server calls accept(), you capture the return value of the function - that will be the socket you will use to communicate with that client. So a client uses a minimum of one socket, a server - two(one for accept()ing, and one for the connection with a client).

>>static void BAIL(...)
Just curious, why is it static?

I used static void cause.. when i tried using.. struct i was getting errors.. so when i used static it worked like a charm..

btw.. Sebastiani thanx for the info im still a bit confused in socket programming.. but im sure i will get it soon =) thanx again

btw.. what would the loop represent.. what would you normaly loop there? cause as far as what i was doing.. i was looping send and recv to get date and send it.. what do you suggest.. is this wrong or write?

I used static void cause.. when i tried using.. struct i was getting errors..

*begins to giggle wildly*

*cough cough*
Erm, have you ever considered the reason that "struct" was giving you errors? You do not declare a function by calling it a struct.

Code:

//Example of a struct, and making a global object of one
struct myStructureWithVariablesInIt
{
     int variable1;
     char variable2;
     std::string variable3;
     SomeClass variable4;
     float variable5;
};

//This is the C++ way of making an object of the struct
myStructureWithVariablesInIt someStructure;
//This is the C way of making an object of the struct
struct myStructureWithVariablesInIt someStructure2;


//Example of a global function
void doSomething(int argument1, float argument2)
{
     someStructure.variable1 = argument1;
     someStructure.variable5 = argument2;
}

Note the lack of "struct" or "static" or anything else before the "void".

I hope this is just a bad day for you, but if it's not then (not meaning to be harsh) I suggest you go back and learn about functions/structures/loops/if's/pointers before taking up socket programming

*begins to giggle wildly =)*

hehe its ok.. i know what i know.. its likei said.. i forgot.. but.. im starting to remember now.. but.. anyways thanx.. Your post was really educational
i understand pointers, loops, if, structures =) but.. anyways.. thanx again just been a while since i coded in c good thing it's similar to php in lots of ways heh

*breathes huge sigh of relief*

sorry.. its just hard to remember after a long time.. im coding like if i never coded before.. but.. little by little im getting it all back