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exec: missing docs, errors

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R=rsc
CC=golang-dev
https://golang.org/cl/4550111
This commit is contained in:
Brad Fitzpatrick 2011-06-02 09:57:24 -07:00
parent e59aa8ea4a
commit f3c351982f
1 changed files with 26 additions and 1 deletions
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27
src/pkg/exec/exec.go
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@ -63,6 +63,7 @@ type Cmd struct {
err os.Error // last error (from LookPath, stdin, stdout, stderr)
process *os.Process
finished bool // when Wait was called
childFiles []*os.File
closeAfterStart []*os.File
closeAfterWait []*os.File
@ -182,7 +183,7 @@ func (c *Cmd) writerDescriptor(w io.Writer) (f *os.File, err os.Error) {
return pw, nil
}
// Run runs the specified command and waits for it to complete.
// Run starts the specified command and waits for it to complete.
//
// The returned error is nil if the command runs, has no problems
// copying stdin, stdout, and stderr, and exits with a zero exit
@ -198,6 +199,7 @@ func (c *Cmd) Run() os.Error {
return c.Wait()
}
// Start starts the specified command but does not wait for it to complete.
func (c *Cmd) Start() os.Error {
if c.err != nil {
return c.err
@ -239,10 +241,24 @@ func (c *Cmd) Start() os.Error {
return nil
}
// Wait waits for the command to exit.
// It must have been started by Start.
//
// The returned error is nil if the command runs, has no problems
// copying stdin, stdout, and stderr, and exits with a zero exit
// status.
//
// If the command fails to run or doesn't complete successfully, the
// error is of type *os.Waitmsg. Other error types may be
// returned for I/O problems.
func (c *Cmd) Wait() os.Error {
if c.process == nil {
return os.NewError("exec: not started")
}
if c.finished {
return os.NewError("exec: Wait was already called")
}
c.finished = true
msg, err := c.process.Wait(0)
var copyError os.Error
@ -267,6 +283,9 @@ func (c *Cmd) Wait() os.Error {
// Output runs the command and returns its standard output.
func (c *Cmd) Output() ([]byte, os.Error) {
if c.Stdout != nil {
return nil, os.NewError("exec: Stdout already set")
}
var b bytes.Buffer
c.Stdout = &b
err := c.Run()
@ -276,6 +295,12 @@ func (c *Cmd) Output() ([]byte, os.Error) {
// CombinedOutput runs the command and returns its combined standard
// output and standard error.
func (c *Cmd) CombinedOutput() ([]byte, os.Error) {
if c.Stdout != nil {
return nil, os.NewError("exec: Stdout already set")
}
if c.Stderr != nil {
return nil, os.NewError("exec: Stderr already set")
}
var b bytes.Buffer
c.Stdout = &b
c.Stderr = &b