rustc/vendor/sysinfo-0.33.0/md_doc/pid.md

Process ID.

Can be used as an integer type by simple casting. For example:

use sysinfo::Pid;

// 0's type will be different depending on the platform!
let p = Pid::from(0);

// For something more "general":
let p = Pid::from_u32(0);
let i: u32 = p.as_u32();

On glibc systems this is a glibc pid_t.

On Windows systems this is a usize and represents a windows process identifier.

On unsupported systems, this is also a usize.