pm2 attach <pm_id>

[Unitech]

Allow to attach to a process stdin (and stdout) in order to send commands.
This is very useful when you have implemented a kind of CLI in an application (IoT, electronic...).

How we fork a process:

 var cspr = spawn(command, args, {
          env      : pm2_env,
          detached : true,
          cwd      : pm2_env.pm_cwd || process.cwd(),
          stdio    : ['pipe', 'pipe', 'pipe', 'ipc']   //Same as fork() in node core
 });

https://github.com/Unitech/pm2/blob/master/lib/God/ForkMode.js#L94

Potential solution

Use Node.js readline via pm2 attach <proc_id> and at every new command (separated by a \n), send to PM2 daemon method that will do a `God.clusters_db[pm_id].stdin.write(CMD)

@vmarchaud thoughts?

[Unitech]

• poc to write on forked process stdin
• pm2 attach <pm_id>
• pm2-runtime <app.js> --attach

[Unitech]

Published on PM2 2.6.0:

$ npm install pm2@latest -g
$ pm2 update
$ pm2 attach 0

[GGYaX]

pm2-runtime <app.js> --attach seems to work only for stdout but not stdin

[naturecodevoid]

was this feature removed? I can’t find it in the docs

edit: nevermind, found this file

[grantweii]

I'm getting this error when using npm prompt - which requests input from stdin ENXIO: no such device or address, open '/dev/tty'.