Imported Upstream version 60upstream/60

1 files changed, 77 insertions, 0 deletions

diff --git a/src/pkg/os/exec_unix.go b/src/pkg/os/exec_unix.go
new file mode 100644
index 000000000..8a4b2e1b8
--- /dev/null
+++ b/src/pkg/os/exec_unix.go
@@ -0,0 +1,77 @@
+// Copyright 2009 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 os
+
+import (
+	"runtime"
+	"syscall"
+)
+
+// 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) {
+	if p.Pid == -1 {
+		return nil, 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 {
+		return nil, NewSyscallError("wait", e)
+	}
+	if options&WSTOPPED == 0 {
+		p.done = true
+	}
+	w = new(Waitmsg)
+	w.Pid = pid1
+	w.WaitStatus = status
+	w.Rusage = rusage
+	return w, nil
+}
+
+// Signal sends a signal to the Process.
+func (p *Process) Signal(sig Signal) Error {
+	if p.done {
+		return NewError("os: process already finished")
+	}
+	if e := syscall.Kill(p.Pid, int(sig.(UnixSignal))); e != 0 {
+		return Errno(e)
+	}
+	return nil
+}
+
+// Release releases any resources associated with the Process.
+func (p *Process) Release() Error {
+	// NOOP for unix.
+	p.Pid = -1
+	// no need for a finalizer anymore
+	runtime.SetFinalizer(p, nil)
+	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) {
+	// NOOP for unix.
+	return newProcess(pid, 0), nil
+}