taketty
Create a new PTY that other programs can attach to as their controlling terminal.
Building
make
Usage
Creating a PTY
Run taketty to create a new PTY and forward I/O:
./taketty
This will:
- Create a new PTY via /dev/ptmx
- Configure and unlock the slave
- Put the master terminal in raw mode
- Forward stdin/stdout to the PTY master
- Print the slave path to stderr as TAKETTY_PTY=/dev/pts/N
Attaching to the PTY
Method 1: Using the attach helper (with job control)
In another terminal, capture the PTY path and use the attach helper to exec a shell:
export TAKETTY_PTY=/dev/pts/N
./attach $TAKETTY_PTY bash
Or pass the command directly:
./attach /dev/pts/N bash
The attach helper will:
- Call setsid() to create a new session
- Open the slave PTY
- Use ioctl(TIOCSCTTY) to make it the controlling terminal
- Redirect stdin/stdout/stderr to the PTY
- Execute the specified program (or return if none specified)
Method 2: Source the bash script (I/O only, no job control)
If you only need I/O redirection without full job control:
export TAKETTY_PTY=/dev/pts/N
source ./attach.sh
Note: This method redirects file descriptors but doesn't set the controlling terminal, so signals like Ctrl+C won't work as expected.
Architecture
- taketty.c: Creates PTY master, forwards I/O between stdin/stdout and master FD
- attach.c: Helper to attach a process to the PTY slave as controlling terminal
- attach.sh: Bash script for simple I/O redirection (sourcing only)