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Library for creating a new process detached from the controlling terminal (daemon).

• Minimal library to daemonize, fork, double-fork a process.
• daemon(3) has beendeprecated in MacOSX 10.5, by usingfork andsetsid syscalls, new methodscan be created to achieve the same goal.

Example:

Create a new test project:

$ cargo new --bin myapp

To installcargo use:curl https://sh.rustup.rs -sSf | sh

Addfork as a depdendecie:

cargo add fork

or Editmyapp/Cargo.toml and add to[dependencies]:

fork = "0.1"

Add the following code tomyapp/main.rs

use fork::{daemon,Fork};use std::process::Command;fnmain(){ifletOk(Fork::Child) =daemon(false,false){Command::new("sleep").arg("300").output().expect("failed to execute process");}}

If usingdaemon(false, false),it willchdir to/ and close the standard input, standard output, and standard error file descriptors.

Test running:

$ cargo run

Useps to check the process, for example:

$ ps -axo ppid,pid,pgid,sess,tty,tpgid,stat,uid,%mem,%cpu,command, | egrep "myapp|sleep|PID"

egrep is used to show theps headers

Output should be something like:

 PPID   PID  PGID   SESS TTY      TPGID STAT   UID       %MEM  %CPU COMMAND    1 48738 48737      0 ??           0 S      501        0.0   0.0 target/debug/myapp48738 48753 48737      0 ??           0 S      501        0.0   0.0 sleep 300

• PPID == 1 that's the parent process

• TTY = ?? no controlling terminal

• newPGID = 48737

  1 - root (init/launchd) \-- 48738 myapp        PGID - 48737  \--- 48753 sleep      PGID - 48737