120 lines
2.4 KiB
Go
120 lines
2.4 KiB
Go
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// +build windows
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package ps
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import (
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"fmt"
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"syscall"
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"unsafe"
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)
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// Windows API functions
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var (
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modKernel32 = syscall.NewLazyDLL("kernel32.dll")
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procCloseHandle = modKernel32.NewProc("CloseHandle")
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procCreateToolhelp32Snapshot = modKernel32.NewProc("CreateToolhelp32Snapshot")
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procProcess32First = modKernel32.NewProc("Process32FirstW")
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procProcess32Next = modKernel32.NewProc("Process32NextW")
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)
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// Some constants from the Windows API
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const (
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ERROR_NO_MORE_FILES = 0x12
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MAX_PATH = 260
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)
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// PROCESSENTRY32 is the Windows API structure that contains a process's
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// information.
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type PROCESSENTRY32 struct {
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Size uint32
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CntUsage uint32
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ProcessID uint32
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DefaultHeapID uintptr
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ModuleID uint32
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CntThreads uint32
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ParentProcessID uint32
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PriorityClassBase int32
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Flags uint32
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ExeFile [MAX_PATH]uint16
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}
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// WindowsProcess is an implementation of Process for Windows.
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type WindowsProcess struct {
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pid int
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ppid int
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exe string
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}
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func (p *WindowsProcess) Pid() int {
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return p.pid
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}
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func (p *WindowsProcess) PPid() int {
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return p.ppid
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}
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func (p *WindowsProcess) Executable() string {
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return p.exe
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}
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func newWindowsProcess(e *PROCESSENTRY32) *WindowsProcess {
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// Find when the string ends for decoding
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end := 0
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for {
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if e.ExeFile[end] == 0 {
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break
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}
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end++
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}
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return &WindowsProcess{
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pid: int(e.ProcessID),
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ppid: int(e.ParentProcessID),
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exe: syscall.UTF16ToString(e.ExeFile[:end]),
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}
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}
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func findProcess(pid int) (Process, error) {
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ps, err := processes()
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if err != nil {
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return nil, err
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}
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for _, p := range ps {
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if p.Pid() == pid {
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return p, nil
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}
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}
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return nil, nil
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}
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func processes() ([]Process, error) {
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handle, _, _ := procCreateToolhelp32Snapshot.Call(
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0x00000002,
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0)
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if handle < 0 {
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return nil, syscall.GetLastError()
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}
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defer procCloseHandle.Call(handle)
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var entry PROCESSENTRY32
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entry.Size = uint32(unsafe.Sizeof(entry))
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ret, _, _ := procProcess32First.Call(handle, uintptr(unsafe.Pointer(&entry)))
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if ret == 0 {
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return nil, fmt.Errorf("Error retrieving process info.")
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}
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results := make([]Process, 0, 50)
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for {
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results = append(results, newWindowsProcess(&entry))
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ret, _, _ := procProcess32Next.Call(handle, uintptr(unsafe.Pointer(&entry)))
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if ret == 0 {
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break
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}
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}
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return results, nil
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}
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