https://github.com/rapiz1/catp

Print the output of a running process
https://github.com/rapiz1/catp

Last synced: 5 days ago
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Print the output of a running process

• Host: GitHub
• URL: https://github.com/rapiz1/catp
• Owner: rapiz1
• License: gpl-3.0
• Created: 2022-07-23T12:32:06.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2022-07-27T12:28:17.000Z (over 2 years ago)
• Last Synced: 2025-02-08T12:03:49.965Z (12 days ago)
• Language: Rust
• Size: 1.01 MB
• Stars: 1,182
• Watchers: 4
• Forks: 26
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# catp

[![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/rapiz1/catp)](https://github.com/rapiz1/catp/releases)

![GitHub Workflow Status (branch)](https://img.shields.io/github/workflow/status/rapiz1/catp/Rust/main)

Print the output of *a running process*

![screenshot](docs/img/screenshot.png)

```plain

catp 0.2.0

Print the output of a running process

USAGE:

    catp [OPTIONS] 

ARGS:

        PID of the process to print

OPTIONS:

    -h, --help       Print help information

    -v, --verbose    Print more verbose information to stderr

    -V, --version    Print version information

```

## Why

Sometimes a process is redirected to `/dev/null` because we don't expect to check its output.

However, we may regret that decision and don't want to restart the process.

Or we just don't know where a running process is printing to.

Then just type `catp`!

## How It Works

`catp` uses `ptrace` to intercept syscall and extracts data from the syscall `write`.

So it should work for most applications. Since it slows down the syscall, it may impact the performance of IO-sensitive applications.

`catp` requires `ptrace` privilege to run, which in most systems means root.

## Get Started

Download the binary from [release](https://github.com/rapiz1/catp/releases). The one with `gnu` should work with a really recent glibc version. If that's not working, try the `musl` one.

## Platform

Currently only x86_64 Linux is supported.