| // Copyright 2014 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package server |
| |
| // TODO: syscall.PTRACE_O_TRACECLONE shenanigans to trace multi-threaded |
| // programs. |
| |
| import ( |
| "fmt" |
| "os" |
| "runtime" |
| "syscall" |
| ) |
| |
| // ptraceRun runs all the closures from fc on a dedicated OS thread. Errors |
| // are returned on ec. Both channels must be unbuffered, to ensure that the |
| // resultant error is sent back to the same goroutine that sent the closure. |
| func ptraceRun(fc chan func() error, ec chan error) { |
| if cap(fc) != 0 || cap(ec) != 0 { |
| panic("ptraceRun was given unbuffered channels") |
| } |
| runtime.LockOSThread() |
| for f := range fc { |
| ec <- f() |
| } |
| } |
| |
| func (s *Server) startProcess(name string, argv []string, attr *os.ProcAttr) (proc *os.Process, err error) { |
| s.fc <- func() error { |
| var err1 error |
| proc, err1 = os.StartProcess(name, argv, attr) |
| return err1 |
| } |
| return proc, <-s.ec |
| } |
| |
| func (s *Server) ptraceCont(pid int, signal int) (err error) { |
| s.fc <- func() error { |
| return syscall.PtraceCont(pid, signal) |
| } |
| return <-s.ec |
| } |
| |
| func (s *Server) ptraceGetRegs(pid int, regsout *syscall.PtraceRegs) (err error) { |
| s.fc <- func() error { |
| return syscall.PtraceGetRegs(pid, regsout) |
| } |
| return <-s.ec |
| } |
| |
| func (s *Server) ptraceSetRegs(pid int, regs *syscall.PtraceRegs) (err error) { |
| s.fc <- func() error { |
| return syscall.PtraceSetRegs(pid, regs) |
| } |
| return <-s.ec |
| } |
| |
| func (s *Server) ptracePeek(pid int, addr uintptr, out []byte) (err error) { |
| s.fc <- func() error { |
| n, err := syscall.PtracePeekText(pid, addr, out) |
| if err != nil { |
| return err |
| } |
| if n != len(out) { |
| return fmt.Errorf("ptracePeek: peeked %d bytes, want %d", n, len(out)) |
| } |
| return nil |
| } |
| return <-s.ec |
| } |
| |
| func (s *Server) ptracePoke(pid int, addr uintptr, data []byte) (err error) { |
| s.fc <- func() error { |
| n, err := syscall.PtracePokeText(pid, addr, data) |
| if err != nil { |
| return err |
| } |
| if n != len(data) { |
| return fmt.Errorf("ptracePoke: poked %d bytes, want %d", n, len(data)) |
| } |
| return nil |
| } |
| return <-s.ec |
| } |
| |
| func (s *Server) ptraceSingleStep(pid int) (err error) { |
| s.fc <- func() error { |
| return syscall.PtraceSingleStep(pid) |
| } |
| return <-s.ec |
| } |
| |
| func (s *Server) wait() (err error) { |
| var status syscall.WaitStatus |
| s.fc <- func() error { |
| _, err1 := syscall.Wait4(-1, &status, 0, nil) |
| return err1 |
| } |
| // TODO: do something with status. |
| return <-s.ec |
| } |