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use std::fmt::{self, Formatter, Debug};
use libc::{c_int, gid_t, kill, pid_t, uid_t};
#[derive(Clone)]
pub struct Process {
pub name: String,
pub cmd: Vec<String>,
pub exe: String,
pub pid: pid_t,
pub parent: Option<pid_t>,
pub environ: Vec<String>,
pub cwd: String,
pub root: String,
pub memory: u64,
utime: u64,
stime: u64,
old_utime: u64,
old_stime: u64,
pub start_time: u64,
updated: bool,
pub cpu_usage: f32,
pub uid: uid_t,
pub gid: gid_t,
}
impl Process {
pub fn new(pid: pid_t, parent: Option<pid_t>, start_time: u64) -> Process {
Process {
name: String::new(),
pid: pid,
parent: parent,
cmd: Vec::new(),
environ: Vec::new(),
exe: String::new(),
cwd: String::new(),
root: String::new(),
memory: 0,
cpu_usage: 0.,
utime: 0,
stime: 0,
old_utime: 0,
old_stime: 0,
updated: true,
start_time: start_time,
uid: 0,
gid: 0,
}
}
pub fn kill(&self, signal: ::Signal) -> bool {
unsafe { kill(self.pid, signal as c_int) == 0 }
}
}
#[allow(unused_must_use)]
impl Debug for Process {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
writeln!(f, "pid: {}", self.pid);
writeln!(f, "parent: {:?}", self.parent);
writeln!(f, "name: {}", self.name);
writeln!(f, "environment:");
for var in &self.environ {
if !var.is_empty() {
writeln!(f, "\t{}", var);
}
}
writeln!(f, "command:");
for arg in &self.cmd {
writeln!(f, "\t{}", arg);
}
writeln!(f, "executable path: {}", self.exe);
writeln!(f, "current working directory: {}", self.cwd);
writeln!(f, "owner/group: {}:{}", self.uid, self.gid);
writeln!(f, "memory usage: {} kB", self.memory);
writeln!(f, "cpu usage: {}%", self.cpu_usage);
write!(f, "root path: {}", self.root)
}
}
pub fn compute_cpu_usage(p: &mut Process, time: u64, task_time: u64) {
let system_time_delta = task_time - p.old_utime;
let time_delta = time - p.old_stime;
p.old_utime = task_time;
p.old_stime = time;
p.cpu_usage = if time_delta == 0 {
0f32
} else {
(system_time_delta as f64 * 100f64 / time_delta as f64) as f32
};
if p.cpu_usage > 100f32 {
p.cpu_usage = 100f32;
}
p.updated = true;
}
pub fn has_been_updated(p: &mut Process) -> bool {
let old = p.updated;
p.updated = false;
old
}