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|
// +build freebsd,amd64
package ps
import (
"bytes"
"encoding/binary"
"syscall"
"unsafe"
)
// copied from sys/sysctl.h
const (
CTL_KERN = 1 // "high kernel": proc, limits
KERN_PROC = 14 // struct: process entries
KERN_PROC_PID = 1 // by process id
KERN_PROC_PROC = 8 // only return procs
KERN_PROC_PATHNAME = 12 // path to executable
)
// copied from sys/user.h
type Kinfo_proc struct {
Ki_structsize int32
Ki_layout int32
Ki_args int64
Ki_paddr int64
Ki_addr int64
Ki_tracep int64
Ki_textvp int64
Ki_fd int64
Ki_vmspace int64
Ki_wchan int64
Ki_pid int32
Ki_ppid int32
Ki_pgid int32
Ki_tpgid int32
Ki_sid int32
Ki_tsid int32
Ki_jobc [2]byte
Ki_spare_short1 [2]byte
Ki_tdev int32
Ki_siglist [16]byte
Ki_sigmask [16]byte
Ki_sigignore [16]byte
Ki_sigcatch [16]byte
Ki_uid int32
Ki_ruid int32
Ki_svuid int32
Ki_rgid int32
Ki_svgid int32
Ki_ngroups [2]byte
Ki_spare_short2 [2]byte
Ki_groups [64]byte
Ki_size int64
Ki_rssize int64
Ki_swrss int64
Ki_tsize int64
Ki_dsize int64
Ki_ssize int64
Ki_xstat [2]byte
Ki_acflag [2]byte
Ki_pctcpu int32
Ki_estcpu int32
Ki_slptime int32
Ki_swtime int32
Ki_cow int32
Ki_runtime int64
Ki_start [16]byte
Ki_childtime [16]byte
Ki_flag int64
Ki_kiflag int64
Ki_traceflag int32
Ki_stat [1]byte
Ki_nice [1]byte
Ki_lock [1]byte
Ki_rqindex [1]byte
Ki_oncpu [1]byte
Ki_lastcpu [1]byte
Ki_ocomm [17]byte
Ki_wmesg [9]byte
Ki_login [18]byte
Ki_lockname [9]byte
Ki_comm [20]byte
Ki_emul [17]byte
Ki_sparestrings [68]byte
Ki_spareints [36]byte
Ki_cr_flags int32
Ki_jid int32
Ki_numthreads int32
Ki_tid int32
Ki_pri int32
Ki_rusage [144]byte
Ki_rusage_ch [144]byte
Ki_pcb int64
Ki_kstack int64
Ki_udata int64
Ki_tdaddr int64
Ki_spareptrs [48]byte
Ki_spareint64s [96]byte
Ki_sflag int64
Ki_tdflags int64
}
// UnixProcess is an implementation of Process that contains Unix-specific
// fields and information.
type UnixProcess struct {
pid int
ppid int
state rune
pgrp int
sid int
binary string
}
func (p *UnixProcess) Pid() int {
return p.pid
}
func (p *UnixProcess) PPid() int {
return p.ppid
}
func (p *UnixProcess) Executable() string {
return p.binary
}
// Refresh reloads all the data associated with this process.
func (p *UnixProcess) Refresh() error {
mib := []int32{CTL_KERN, KERN_PROC, KERN_PROC_PID, int32(p.pid)}
buf, length, err := call_syscall(mib)
if err != nil {
return err
}
proc_k := Kinfo_proc{}
if length != uint64(unsafe.Sizeof(proc_k)) {
return err
}
k, err := parse_kinfo_proc(buf)
if err != nil {
return err
}
p.ppid, p.pgrp, p.sid, p.binary = copy_params(&k)
return nil
}
func copy_params(k *Kinfo_proc) (int, int, int, string) {
n := -1
for i, b := range k.Ki_comm {
if b == 0 {
break
}
n = i + 1
}
comm := string(k.Ki_comm[:n])
return int(k.Ki_ppid), int(k.Ki_pgid), int(k.Ki_sid), comm
}
func findProcess(pid int) (Process, error) {
mib := []int32{CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, int32(pid)}
_, _, err := call_syscall(mib)
if err != nil {
return nil, err
}
return newUnixProcess(pid)
}
func processes() ([]Process, error) {
results := make([]Process, 0, 50)
mib := []int32{CTL_KERN, KERN_PROC, KERN_PROC_PROC, 0}
buf, length, err := call_syscall(mib)
if err != nil {
return results, err
}
// get kinfo_proc size
k := Kinfo_proc{}
procinfo_len := int(unsafe.Sizeof(k))
count := int(length / uint64(procinfo_len))
// parse buf to procs
for i := 0; i < count; i++ {
b := buf[i*procinfo_len : i*procinfo_len+procinfo_len]
k, err := parse_kinfo_proc(b)
if err != nil {
continue
}
p, err := newUnixProcess(int(k.Ki_pid))
if err != nil {
continue
}
p.ppid, p.pgrp, p.sid, p.binary = copy_params(&k)
results = append(results, p)
}
return results, nil
}
func parse_kinfo_proc(buf []byte) (Kinfo_proc, error) {
var k Kinfo_proc
br := bytes.NewReader(buf)
err := binary.Read(br, binary.LittleEndian, &k)
if err != nil {
return k, err
}
return k, nil
}
func call_syscall(mib []int32) ([]byte, uint64, error) {
miblen := uint64(len(mib))
// get required buffer size
length := uint64(0)
_, _, err := syscall.RawSyscall6(
syscall.SYS___SYSCTL,
uintptr(unsafe.Pointer(&mib[0])),
uintptr(miblen),
0,
uintptr(unsafe.Pointer(&length)),
0,
0)
if err != 0 {
b := make([]byte, 0)
return b, length, err
}
if length == 0 {
b := make([]byte, 0)
return b, length, err
}
// get proc info itself
buf := make([]byte, length)
_, _, err = syscall.RawSyscall6(
syscall.SYS___SYSCTL,
uintptr(unsafe.Pointer(&mib[0])),
uintptr(miblen),
uintptr(unsafe.Pointer(&buf[0])),
uintptr(unsafe.Pointer(&length)),
0,
0)
if err != 0 {
return buf, length, err
}
return buf, length, nil
}
func newUnixProcess(pid int) (*UnixProcess, error) {
p := &UnixProcess{pid: pid}
return p, p.Refresh()
}
|
