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Full Discussion: How to Run a Linux Command and Redirect its output to a socket in C
Top Forums Programming How to Run a Linux Command and Redirect its output to a socket in C Post 302258408 by Corona688 on Friday 14th of November 2008 01:03:22 PM
Old 11-14-2008
I think you can redirect the output to a stream socket if you fork and exec rather than using popen. This is because the redirection has to happen before you run the program, not after.

Code:
{
  pid_t pid=fork();
  int st;

  if(pid < 0)
  {
    perror("Couldn't fork");
  }
  else if(pid == 0) /* child code, run in a seperate process */
  {
    dup2(sock, 1); /* Duplicate socket's FD over FD #1, aka stdout */
    dup2(sock, 0); /* Duplicate socket's FD over FD #0, aka stdin */
    close(sock); /* Only closes the child's copy.  And the stdin/stdout copies remain. */
    execlp("/bin/echo", "HEY GUYS ALJ AF MY FACE IS A ROTTORN BANANA");
    /* Code below will never happen unless exec fails */
    perror("Couldn't exec");
    exit(1);
  }
  else
  {
    close(sock); /* Parent doesn't need socket anymore */
    waitpid(pid, &st, 0); /* Wait for child to finish */
  }
}

 

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LEARN ABOUT DEBIAN

efax-gtk-socket-client

efax-gtk-socket-client(1)				      General Commands Manual					 efax-gtk-socket-client(1)

NAME

       efax-gtk-socket-client - a client of efax-gtk to work with lpd/lprng

SYNOPSIS

       efax-gtk-socket-client [hostname] [port]

DESCRIPTION

       This program enables lpd/lprng to access the efax-gtk socket server. Meaning the user can send faxes to a printer, which will ack as a fax.

       It  takes  two arguments - first a hostname to connect to, and secondly a port number at that hostname to connect to.  All efax-gtk-socket-
       client does is to read from standard input (in this case from lpd/lprng) and passes it to a socket at the hostname and port  number  passed
       as arguments to it (namely the hostname of the computer efax-gtk is running on - normally you would specify localhost - and the port number
       of the socket).

       fax:
	    :sd=/var/spool/fax:
	    :mx#0:
	    :sh:
	    :lp=/dev/null:
	    :if=/var/spool/fax/efax-gtk-faxfilter:

       This will cause a printer by the name of "fax" to be available, which (if printed to) will send the file to the efax-gtk socket server.	If
       you  set  efax-gtk  to  listen on a port other than port 9900, you will need to amend the file /var/spool/fax/efax-gtk-faxfilter by hand to
       specify the correct port number on which efax-gtk is listening.

       Don't forget to restart the lpd printer daemon after amending /etc/printcap.

OPTIONS

       [ hostname ] - The name of the host to listen to. Usually should be locahlhost.
       [ port ] - the port number to listen to on the [ hostname ].

SEE ALSO

       efax(1), efax-gtk(1).

AUTHOR

       efax-gtk-socket-client was written by  Chris Vine <chris@cvine.freeserve.co.uk>.

       This manual page was written by Lior Kaplan <kaplan@debian.org>, for the Debian project (but may be used by others).

								   July 18, 2006					 efax-gtk-socket-client(1)
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