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    <p>I also had this problem, but I use gdb in KDevelop sparsely enough that hadn't bothered me yet. Here's my log of trying to fix it:</p> <p>Grepping through the GDB 7.3.1 source code reveals that this message is printed when GDB tries to set its master TTY to a newly-created pseudo-tty (see gdb/inflow.c, lines 683-740). In particular, a call to ioctl with request TIOCSCTTY fails with a permissions error.</p> <p>With this in mind, I took a look at the Linux kernel source code to see what could cause a failure. A bit of searching shows that it will eventually degenerate into a call to tiocsctty(). The comment from tiocsctty that is important here:</p> <pre><code>/* * The process must be a session leader and * not have a controlling tty already. */ </code></pre> <p>Since the only other reason it can fail with EPERM is if the tty that GDB creates is actually a controlling tty for <em>another</em> process (which seems highly unlikely), I thought it reasonable to assume that GDB is not a session leader. Fair enough, it's launched by KDevelop after all!</p> <p>So: I tried <em>not</em> launching the GDB session in an external terminal, and it works. Problem narrowed down.</p> <p>Originally, the external terminal line was set to <code>konsole --noclose --workdir %workdir -e %exe</code>. Changing this to <code>terminator -e %exe</code> made a slight difference: KDevelop warned me that</p> <pre><code>GDB cannot use the tty* or pty* devices. Check the settings on /dev/tty* and /dev/pty* As root you may need to "chmod ug+rw" tty* and pty* devices and/or add the user to the tty group using "usermod -G tty username". </code></pre> <p>I checked my permissions; my user was part of the tty group and all relevant files were readable and writable.</p> <p>Grepping through the KDevelop source code reveals how KDevelop actually sets up the terminal. It runs the shell script</p> <pre><code>tty &gt; FIFO_PATH ; trap "" INT QUIT TSTP ; exec&lt;&amp;-; exec&gt;&amp;-; while :; do sleep 3600;done </code></pre> <p>and then sets up GDB to use the terminal device it reads from FIFO_PATH. (My name, by the way, not the one that KDevelop uses.) The problem (as best I can tell) is that gdb is not launched as a child of the shell script, and thus cannot use it as its main tty.</p> <p>I'm not feeling up to patching KDevelop to make this work properly as of yet (or finding what actually caused this to stop working in the first place . . .), so the best I can suggest at the moment is to simply not use an external terminal for debugging purposes.</p> <p>Good luck! I'll update if I find anything useful.</p>
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    1. COand you only got +54 for your reply?! dude that goes on my twitter straight away! What a nice/perfect feedback
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