Sockets!?!?!?!?!?! Post: 39308

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Top Forums Programming Sockets!?!?!?!?!?! Post 39308 by bigB8210 on Tuesday 12th of August 2003 10:47:15 PM

08-12-2003

Registered User

Thanks!! More questions

Thanks for the info, looks good. I actually found some better a better example and wrote the code below, if your interested. (Note there will be a few changes once I compile, I'm almost absolutely sure on that). Now comes the big questions:

1. How can I get the program to startup when the linux kernel starts up(keep in mind it is only a does prompt, like unix)?

2. Where can I find a C compiler?

I know that at least one of them is probably easy, but my only excuse is that it has been a very long day.

Thanks for all your assistance.

Code:

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

int main()
{
 int sockfd, newsockfd, clilen, n;
 int portno = 8010;
 char buffer[256];
 struct sockaddr_in serv_addr,cli_addr;
 
 sockfd = socket(AF_INET, SOCK_STREAM, 0);
 if(sockfd < 0)
 {
  error("ERROR opening socket");
 }
 bzero((char *) &serv_addr, sizeof(serv_addr));
 
 serv_addr.sin_family = AF_INET;
 serv_addr.sin_port = htons(portno);
 serv_addr.sin_addr.s_addr = INADDR_ANY;
 
 if(bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
 {
  error("ERROR on binding");
 }
 while(1==1)
 {
  listen(sockfd,5);
  clilen = sizeof(cli_addr);
  newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
  if(newsockfd < 0)
  {
   error("ERROR on accept");
  }
  bzero(buffer,256);
  n = read(newscokfd, buffer, 255);
  if(n < 0)
  {
   error("ERROR reading from socket");
  }
  else
  {
   system("./RunFile.sh");
   n = write(newsockfd,"Success",7);
   if(n < 0)
   {
    error("ERROR writing to socket");
   }
  }
 }
 return 0;
}

bigB8210

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getsockname

GETSOCKNAME(2)						     Linux Programmer's Manual						    GETSOCKNAME(2)

NAME

       getsockname - get socket name

SYNOPSIS

       #include <sys/socket.h>

       int getsockname(int sockfd, struct sockaddr *addr, socklen_t *addrlen);

DESCRIPTION

       getsockname()  returns  the  current  address  to which the socket sockfd is bound, in the buffer pointed to by addr.  The addrlen argument
       should be initialized to indicate the amount of space (in bytes) pointed to by addr.  On return it contains the actual size of  the  socket
       address.

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       to the call.

RETURN VALUE

       On success, zero is returned.  On error, -1 is returned, and errno is set appropriately.

ERRORS

       EBADF  The argument sockfd is not a valid descriptor.

       EFAULT The addr argument points to memory not in a valid part of the process address space.

       EINVAL addrlen is invalid (e.g., is negative).

       ENOBUFS
	      Insufficient resources were available in the system to perform the operation.

       ENOTSOCK
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CONFORMING TO

       SVr4, 4.4BSD (the getsockname() function call appeared in 4.2BSD), POSIX.1-2001.

NOTES

       The third argument of getsockname() is in reality an int * (and this is what 4.x BSD and libc4  and  libc5  have).   Some  POSIX  confusion
       resulted in the present socklen_t, also used by glibc.  See also accept(2).

SEE ALSO

       bind(2), socket(2), getifaddrs(3), ip(7), socket(7), unix(7)

COLOPHON

       This  page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2008-12-03							    GETSOCKNAME(2)

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