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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

linux::distribution::packages

Linux::Distribution::Packages(3pm)			User Contributed Perl Documentation			Linux::Distribution::Packages(3pm)

NAME

       Linux::Distribution::Packages - list all packages on various Linux distributions

SYNOPSIS

	 use Linux::Distribution::Packages qw(distribution_packages distribution_write);

	 $linux = new Linux::Distribution::Packages({'format' => 'csv', 'output_file' => 'packages.csv'});
	 $linux->distribution_write();

	 # Or you can (re)set the options when you write.
	 $linux->distribution_write({'format' => 'xml', 'output_file' => 'packages.xml'});

	 # If you want to reload the package data
	 $linux->distribution_packages();

DESCRIPTION

       This is a simple module that uses Linux::Distribution to guess the linux distribution and then uses the correct commands to list all the
       packages on the system and then output them in one of three formats:  native, csv, and xml.

       Distributions currently working:  debian, ubuntu, fedora, redhat, suse, gentoo, slackware, redflag.

       The module inherits from Linux::Distribution, so can also use its calls.

   EXPORT
       None by default.

TODO

       * Add the capability to correctly get packages for all recognized distributions.  * Seperate out parsing from writing.  Parse data to hash
       and give access to hash.  Then write the formatted data from the hash.

AUTHORS

       Judith Lebzelter, <judith@osdl.org> Alberto Re, <alberto@accidia.net>

COPYRIGHT AND LICENSE

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.5 or,
       at your option, any later version of Perl 5 you may have available.

perl v5.10.1							    2006-04-19					Linux::Distribution::Packages(3pm)
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