// +build linux

package ps

import (
	"fmt"
	"io/ioutil"
	"strings"
)

// Refresh reloads all the data associated with this process.
func (p *UnixProcess) Refresh() error {
	statPath := fmt.Sprintf("/proc/%d/stat", p.pid)
	dataBytes, err := ioutil.ReadFile(statPath)
	if err != nil {
		return err
	}

	// First, parse out the image name
	data := string(dataBytes)
	binStart := strings.IndexRune(data, '(') + 1
	binEnd := strings.IndexRune(data[binStart:], ')')
	p.binary = data[binStart : binStart+binEnd]

	// Move past the image name and start parsing the rest
	data = data[binStart+binEnd+2:]
	_, err = fmt.Sscanf(data,
		"%c %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d",
		&p.state,
		&p.ppid,
		&p.pgrp,
		&p.sid,
		&p.ttynr,
		&p.tpgid,
		&p.flags,
		&p.minflt,
		&p.cminflt,
		&p.majflt,
		&p.cmajflt,
		&p.utime,
		&p.stime,
		&p.cutime,
		&p.cstime,
		&p.priority,
		&p.nice,
		&p.numthreads,
		&p.itrealvalue,
		&p.starttime,
		&p.vsize,
		&p.rss)

	return err
}