nelhage/reptyr
Reptyr
Reptyr is a system utility designed for reparenting running programs, managing pseudo-terminals, and controlling standard input and output assignments. It functions as a low-level Unix process controller that updates controlling terminal assignments and redirects input and output for active processes.
The tool allows for moving a running program from one terminal session to another without interrupting its execution. It also provides utilities for generating pseudo-terminal pairs and redirecting file descriptors to capture or proxy terminal sessions.
The project covers broader process management capabilities, including remote session recovery after a terminal disconnect and the ability to capture the master end of a pseudo-terminal to attach all processes on a specific terminal.
Features
- Interactive Process Redirection - Redirects file descriptors and controlling terminal assignments of active processes to different terminal windows.
- Process Reparenting - Attaches running programs to new terminals by redirecting file descriptors to maintain continuous execution.
- Controlling Terminal Assignments - Implements system call-level updates to process group leaders to restore interactive input from a new terminal.
- File Descriptor Redirection - Provides the ability to redirect process input and output by replacing existing file descriptors with new terminal device handles.
- Process Reparenting Utilities - Provides a utility for moving running programs from one terminal session to another without interruption.
- Process Session Migrations - Changes the session identity of target processes to integrate them into new foreground terminal sessions.
- PTY Interfaces - Generates pseudo-terminal pairs and redirects file descriptors to capture or proxy terminal sessions.
- Pseudo-Terminal Interfaces - Creates and manages pseudo-terminal pairs to redirect process I/O for debugging or proxying.
- Unix Process Management - Functions as a low-level Unix tool to update controlling terminal assignments and redirect standard I/O.
- Process Terminal Migrations - Moves running programs between terminal sessions without stopping their execution.
- Ptrace-Based Attachments - Uses ptrace-based system call interception to seize control of running processes and modify their internal state.
- Interactive Session Recovery - Rescues running processes after terminal disconnects or crashes by attaching them to new active sessions.
- Terminal Session Capturing - Captures the master end of a pseudo-terminal to attach all processes residing on a specific terminal.
- PTY Proxies - Generates pseudo-terminal pairs and proxies the master end to the current session for child processes.
- TTY Attribute Synchronizations - Synchronizes terminal attributes and mode configurations from a new shell to a reparented process.
