Imported Upstream version 1upstream/1

1 files changed, 34 insertions, 41 deletions

diff --git a/src/pkg/os/exec_unix.go b/src/pkg/os/exec_unix.go
index 8a4b2e1b8..ecfe5353b 100644
--- a/src/pkg/os/exec_unix.go
+++ b/src/pkg/os/exec_unix.go
@@ -2,65 +2,53 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build darwin freebsd linux netbsd openbsd
+
 package os
 
 import (
+	"errors"
 	"runtime"
 	"syscall"
+	"time"
 )
 
-// Options for Wait.
-const (
-	WNOHANG   = syscall.WNOHANG   // Don't wait if no process has exited.
-	WSTOPPED  = syscall.WSTOPPED  // If set, status of stopped subprocesses is also reported.
-	WUNTRACED = syscall.WUNTRACED // Usually an alias for WSTOPPED.
-	WRUSAGE   = 1 << 20           // Record resource usage.
-)
-
-// WRUSAGE must not be too high a bit, to avoid clashing with Linux's
-// WCLONE, WALL, and WNOTHREAD flags, which sit in the top few bits of
-// the options
-
-// Wait waits for the Process to exit or stop, and then returns a
-// Waitmsg describing its status and an Error, if any. The options
-// (WNOHANG etc.) affect the behavior of the Wait call.
-func (p *Process) Wait(options int) (w *Waitmsg, err Error) {
+func (p *Process) wait() (ps *ProcessState, err error) {
 	if p.Pid == -1 {
-		return nil, EINVAL
+		return nil, syscall.EINVAL
 	}
 	var status syscall.WaitStatus
-	var rusage *syscall.Rusage
-	if options&WRUSAGE != 0 {
-		rusage = new(syscall.Rusage)
-		options ^= WRUSAGE
-	}
-	pid1, e := syscall.Wait4(p.Pid, &status, options, rusage)
-	if e != 0 {
+	var rusage syscall.Rusage
+	pid1, e := syscall.Wait4(p.Pid, &status, 0, &rusage)
+	if e != nil {
 		return nil, NewSyscallError("wait", e)
 	}
-	if options&WSTOPPED == 0 {
+	if pid1 != 0 {
 		p.done = true
 	}
-	w = new(Waitmsg)
-	w.Pid = pid1
-	w.WaitStatus = status
-	w.Rusage = rusage
-	return w, nil
+	ps = &ProcessState{
+		pid:    pid1,
+		status: status,
+		rusage: &rusage,
+	}
+	return ps, nil
 }
 
-// Signal sends a signal to the Process.
-func (p *Process) Signal(sig Signal) Error {
+func (p *Process) signal(sig Signal) error {
 	if p.done {
-		return NewError("os: process already finished")
+		return errors.New("os: process already finished")
 	}
-	if e := syscall.Kill(p.Pid, int(sig.(UnixSignal))); e != 0 {
-		return Errno(e)
+	s, ok := sig.(syscall.Signal)
+	if !ok {
+		return errors.New("os: unsupported signal type")
+	}
+	if e := syscall.Kill(p.Pid, s); e != nil {
+		return e
 	}
 	return nil
 }
 
-// Release releases any resources associated with the Process.
-func (p *Process) Release() Error {
+func (p *Process) release() error {
 	// NOOP for unix.
 	p.Pid = -1
 	// no need for a finalizer anymore
@@ -68,10 +56,15 @@ func (p *Process) Release() Error {
 	return nil
 }
 
-// FindProcess looks for a running process by its pid.
-// The Process it returns can be used to obtain information
-// about the underlying operating system process.
-func FindProcess(pid int) (p *Process, err Error) {
+func findProcess(pid int) (p *Process, err error) {
 	// NOOP for unix.
 	return newProcess(pid, 0), nil
 }
+
+func (p *ProcessState) userTime() time.Duration {
+	return time.Duration(p.rusage.Utime.Nano()) * time.Nanosecond
+}
+
+func (p *ProcessState) systemTime() time.Duration {
+	return time.Duration(p.rusage.Stime.Nano()) * time.Nanosecond
+}