os: rename SyscallError.Errno to SyscallError.Err
This lets us get rid of the OS-dependent implementations
of SyscallError. The name "Err" was chosen to match the
PathError type.
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5651084
diff --git a/src/pkg/os/error.go b/src/pkg/os/error.go
index c3dd06f..135cdae 100644
--- a/src/pkg/os/error.go
+++ b/src/pkg/os/error.go
@@ -12,3 +12,21 @@
}
func (e *PathError) Error() string { return e.Op + " " + e.Path + ": " + e.Err.Error() }
+
+// SyscallError records an error from a specific system call.
+type SyscallError struct {
+ Syscall string
+ Err error
+}
+
+func (e *SyscallError) Error() string { return e.Syscall + ": " + e.Err.Error() }
+
+// NewSyscallError returns, as an error, a new SyscallError
+// with the given system call name and error details.
+// As a convenience, if err is nil, NewSyscallError returns nil.
+func NewSyscallError(syscall string, err error) error {
+ if err == nil {
+ return nil
+ }
+ return &SyscallError{syscall, err}
+}
