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    <blockquote> <p>Is it possible for an application to block data from coming from pipes, but still accepting from a normal user shell</p> </blockquote> <p>It can call <a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/isatty.html" rel="nofollow"><code>isatty</code></a> which will tell it if input comes from a terminal or not.</p> <blockquote> <p>if that's the case, is there anything I can do to make it accept my pipe input</p> </blockquote> <p>There is a way, but you might not like it:</p> <ol> <li>Open a pseudoterminal using <code>posix_openpt</code> <code>grantpt</code> and <code>unlockpt</code>. You now have the "master" fd</li> <li>Fork a new process</li> <li>Call <code>setsid()</code> in the new process to kill its terminal association</li> <li>In the child call <code>ptsname</code> on the fd obtained in step 1</li> <li>Open the name obtained from <code>ptsname</code> and call <code>TIOCSTTY</code> on it - it becomes the controlling terminal</li> <li>Duplicate the descriptor obtained in step 5 into <code>STDIN_FILENO</code></li> <li>Exec your program</li> </ol> <p>You can probably adapt <a href="http://man7.org/tlpi/code/online/dist/pty/pty_fork.c.html" rel="nofollow">the function <code>ptyFork</code></a> from TLPI for this or <a href="http://www.apuebook.com/code3e.html" rel="nofollow">the function <code>pty_fork</code> from APUE</a>.</p> <p>At this point you can write into the master fd - as if it were a pipe - from your process and the child will think it comes from a terminal.</p>
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    1. COBy using your answer, I was able to find a very good explanation about the whole process [here](http://rachid.koucha.free.fr/tech_corner/pty_pdip.html). I made minor adjustments in the example that uses `fork` and `execvp` and worked like a charm =).
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    2. CO@Felipe Good to hear, thanks for the link.
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