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syscall: support more flags when opening directories on Windows

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syscall.Open was artificially limiting the flags that were eligible
to open directories on Windows. This change extend the cases where we
pass FILE_FLAG_BACKUP_SEMANTICS to all flag combinations allowed by
Unix.

Change-Id: Ia7c083bcba070f92ea61c6d67487bdefd0d99546
Reviewed-on: https://go-review.googlesource.com/c/go/+/619295
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
This commit is contained in:
qmuntal 2024-10-10 11:56:56 +02:00 committed by Quim Muntal
parent 9cc737d482
commit d20a4c2403
2 changed files with 6 additions and 4 deletions
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6
src/syscall/syscall_windows.go
View File

@ -388,8 +388,10 @@ func Open(name string, flag int, perm uint32) (fd Handle, err error) {
if perm&S_IWRITE == 0 {
attrs = FILE_ATTRIBUTE_READONLY
}
if createmode == OPEN_EXISTING && access == GENERIC_READ {
// Necessary for opening directory handles.
if flag&O_WRONLY == 0 && flag&O_RDWR == 0 {
// We might be opening or creating a directory.
// CreateFile requires FILE_FLAG_BACKUP_SEMANTICS
// to work with directories.
attrs |= FILE_FLAG_BACKUP_SEMANTICS
}
if flag&O_SYNC != 0 {

4
src/syscall/syscall_windows_test.go
View File

@ -24,8 +24,8 @@ func TestOpen_Dir(t *testing.T) {
err error
}{
{syscall.O_RDONLY, nil},
{syscall.O_CREAT, syscall.ERROR_ACCESS_DENIED}, // TODO(qmuntal): should be allowed.
{syscall.O_RDONLY | syscall.O_CREAT, syscall.ERROR_ACCESS_DENIED}, // TODO(qmuntal): should be allowed.
{syscall.O_CREAT, nil},
{syscall.O_RDONLY | syscall.O_CREAT, nil},
{syscall.O_RDONLY | syscall.O_TRUNC, syscall.ERROR_ACCESS_DENIED},
{syscall.O_WRONLY | syscall.O_RDWR, syscall.EISDIR},
{syscall.O_WRONLY, syscall.EISDIR},