os: delete os.EINVAL and so on
The set of errors forwarded by the os package varied with system and
was therefore non-portable.
Three helpers added for portable error checking: IsExist, IsNotExist, and IsPermission.
One or two more may need to come, but let's keep the set very small to discourage
thinking about errors that way.
R=mikioh.mikioh, gustavo, r, rsc
CC=golang-dev
https://golang.org/cl/5672047
diff --git a/src/pkg/os/exec_unix.go b/src/pkg/os/exec_unix.go
index 7fe7c2f..a5c2281 100644
--- a/src/pkg/os/exec_unix.go
+++ b/src/pkg/os/exec_unix.go
@@ -29,7 +29,7 @@
// (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
+ return nil, syscall.EINVAL
}
var status syscall.WaitStatus
var rusage *syscall.Rusage
