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os: return a *PathError from Readdirnames and Readdir on POSIX platforms

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Previously, Readdirnames returned a *PathError on Windows and Plan 9,
but a *SyscallError on POSIX systems.

In contrast, similar methods (such as Stat) return a *PathError on all platforms.

Fixes #38923

Change-Id: I26395905b1e723933f07b792c7aeee7c335949cd
Reviewed-on: https://go-review.googlesource.com/c/go/+/233917
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Bryan C. Mills 2020-05-13 14:59:29 -04:00
parent c78d215ce3
commit b3d9cf7a07
3 changed files with 10 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/os/dir_darwin.go
View File

@ -28,7 +28,7 @@ func (f *File) readdirnames(n int) (names []string, err error) {
if f.dirinfo == nil {
dir, call, errno := f.pfd.OpenDir()
if errno != nil {
return nil, wrapSyscallError(call, errno)
return nil, &PathError{call, f.name, errno}
}
f.dirinfo = &dirInfo{
dir: dir,
@ -46,11 +46,11 @@ func (f *File) readdirnames(n int) (names []string, err error) {
var dirent syscall.Dirent
var entptr *syscall.Dirent
for len(names) < size || n == -1 {
if res := readdir_r(d.dir, &dirent, &entptr); res != 0 {
if syscall.Errno(res) == syscall.EINTR {
if errno := readdir_r(d.dir, &dirent, &entptr); errno != 0 {
if errno == syscall.EINTR {
continue
}
return names, wrapSyscallError("readdir", syscall.Errno(res))
return names, &PathError{"readdir", f.name, errno}
}
if entptr == nil { // EOF
break
@ -84,4 +84,4 @@ func (f *File) readdirnames(n int) (names []string, err error) {
func closedir(dir uintptr) (err error)
//go:linkname readdir_r syscall.readdir_r
func readdir_r(dir uintptr, entry *syscall.Dirent, result **syscall.Dirent) (res int)
func readdir_r(dir uintptr, entry *syscall.Dirent, result **syscall.Dirent) (res syscall.Errno)

2
src/os/dir_unix.go
View File

@ -50,7 +50,7 @@ func (f *File) readdirnames(n int) (names []string, err error) {
d.nbuf, errno = f.pfd.ReadDirent(d.buf)
runtime.KeepAlive(f)
if errno != nil {
return names, wrapSyscallError("readdirent", errno)
return names, &PathError{"readdirent", f.name, errno}
}
if d.nbuf <= 0 {
break // EOF

4
src/os/os_test.go
View File

@ -688,6 +688,10 @@ func TestReaddirOfFile(t *testing.T) {
if err == nil {
t.Error("Readdirnames succeeded; want non-nil error")
}
var pe *PathError
if !errors.As(err, &pe) || pe.Path != f.Name() {
t.Errorf("Readdirnames returned %q; want a PathError with path %q", err, f.Name())
}
if len(names) > 0 {
t.Errorf("unexpected dir names in regular file: %q", names)
}