code review 4149046: os: Plan 9 support.

src/pkg/os/exec_posix.go

Index: src/pkg/os/exec_posix.go
===================================================================
copy from src/pkg/os/exec.go
copy to src/pkg/os/exec_posix.go
--- a/src/pkg/os/exec.go
+++ b/src/pkg/os/exec_posix.go
@@ -4,40 +4,7 @@
 
 package os
 
-import (
-	"runtime"
-	"syscall"
-)
-
-// Process stores the information about a process created by StartProcess.
-type Process struct {
-	Pid    int
-	handle int
-}
-
-func newProcess(pid, handle int) *Process {
-	p := &Process{pid, handle}
-	runtime.SetFinalizer(p, (*Process).Release)
-	return p
-}
-
-// ProcAttr holds the attributes that will be applied to a new process
-// started by StartProcess.
-type ProcAttr struct {
-	// If Dir is non-empty, the child changes into the directory before
-	// creating the process.
-	Dir string
-	// If Env is non-nil, it gives the environment variables for the
-	// new process in the form returned by Environ.
-	// If it is nil, the result of Environ will be used.
-	Env []string
-	// Files specifies the open files inherited by the new process.  The
-	// first three entries correspond to standard input, standard output, and
-	// standard error.  An implementation may support additional entries,
-	// depending on the underlying operating system.  A nil entry corresponds
-	// to that file being closed when the process starts.
-	Files []*File
-}
+import "syscall"
 
 // StartProcess starts a new process with the program, arguments and attributes
 // specified by name, argv and attr.
@@ -61,7 +28,7 @@
 	sysattr.Files = intfd
 
 	pid, h, e := syscall.StartProcess(name, argv, sysattr)
-	if e != 0 {
+	if iserror(e) {
 		return nil, &PathError{"fork/exec", name, Errno(e)}
 	}
 	return newProcess(pid, h), nil
@@ -76,7 +43,7 @@
 		envv = Environ()
 	}
 	e := syscall.Exec(name, argv, envv)
-	if e != 0 {
+	if iserror(e) {
 		return &PathError{"exec", name, Errno(e)}
 	}
 	return nil
@@ -158,9 +125,3 @@
 	}
 	return res
 }
-
-// Getpid returns the process id of the caller.
-func Getpid() int { return syscall.Getpid() }
-
-// Getppid returns the process id of the caller's parent.
-func Getppid() int { return syscall.Getppid() }