gdb set inferior-tty warning: GDB: Failed to set controlling terminal: Operation not permitted

Question

I am trying to debug a program using (gdb) , this program has a command that let you route the Input/Output of the program been debug into other spawned terminal of the same system (set inferior-tty <myTty> ). I open a new Terminal (/dev/pts/22) and set this option. And start debugging the program.

Straight after I get this message in the second terminal GDB: Failed to set controlling terminal: Operation not permitted

The Input/Output seems to be redirected to this Second Terminal but it missbehaves ending up the command not achieving its functionality.

Terminal1: https://asciinema.org/a/obOQEjLR7lGxLdcje1VQvEHiL Terminal2: https://asciinema.org/a/AEjCyQFqSdiqXNBSRrVW2uuMa

score 1 · Accepted Answer · answered Jul 18 '23 at 13:55

1

In your second terminal, run something like:

tty && tail -f /dev/null

then use the output of the tty command with GDB just as you are currently doing.

Without the tail command your existing shell and GDB are both fighting for control of the terminal.

answered Jul 18 '23 at 13:55

Andrew

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Thank you , it looks like it works , it grabs the standard input of that terminal. It is though unable to pipe the stdout that should be printed there – freddie_ventura Jul 18 '23 at 14:52
Oh, it works with `tail` as well? I've always used `sleep INF`. – ssbssa Jul 18 '23 at 18:53
I use `sleep 99999`. Nice to know that `INF` works, if I ever have an especially long debugging session. – Mark Plotnick Jul 22 '23 at 17:55

gdb set inferior-tty warning: GDB: Failed to set controlling terminal: Operation not permitted

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