* path.cc (etc::dir_changed): Change `io' to a static NO_COPY
variable. Explain why. Add a muto to guard overwriting the changed_h handle by multiple concurrent threads. * path.h (class etc): Drop unused changed_h member.
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parent
217618d3d6
commit
68e41cfcf4
@ -1,3 +1,10 @@
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2012-07-31 Corinna Vinschen <corinna@vinschen.de>
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* path.cc (etc::dir_changed): Change `io' to a static NO_COPY
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variable. Explain why. Add a muto to guard overwriting the changed_h
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handle by multiple concurrent threads.
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* path.h (class etc): Drop unused changed_h member.
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2012-07-30 Christopher Faylor <me.cygwin2012@cgf.cx>
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* winlean.h: Define constant which will be needed eventually. Remove
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@ -4311,46 +4311,58 @@ etc::test_file_change (int n)
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bool
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etc::dir_changed (int n)
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{
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static muto lock NO_COPY;
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static HANDLE changed_h NO_COPY;
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/* io MUST be static because NtNotifyChangeDirectoryFile works asynchronously.
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It may write into io after the function has left, which may result in all
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sorts of stack corruption. */
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static IO_STATUS_BLOCK io NO_COPY;
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if (!change_possible[n])
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{
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static HANDLE changed_h NO_COPY;
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NTSTATUS status;
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IO_STATUS_BLOCK io;
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if (!changed_h)
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{
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OBJECT_ATTRIBUTES attr;
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path_conv dir ("/etc");
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status = NtOpenFile (&changed_h, SYNCHRONIZE | FILE_LIST_DIRECTORY,
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dir.get_object_attr (attr, sec_none_nih), &io,
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FILE_SHARE_VALID_FLAGS, FILE_DIRECTORY_FILE);
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if (!NT_SUCCESS (status))
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lock.init ("etc_dir_changed_lock")->acquire ();
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if (!changed_h)
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{
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path_conv dir ("/etc");
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status = NtOpenFile (&changed_h,
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SYNCHRONIZE | FILE_LIST_DIRECTORY,
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dir.get_object_attr (attr, sec_none_nih),
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&io, FILE_SHARE_VALID_FLAGS,
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FILE_DIRECTORY_FILE);
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if (!NT_SUCCESS (status))
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{
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#ifdef DEBUGGING
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system_printf ("NtOpenFile (%S) failed, %p",
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dir.get_nt_native_path (), status);
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system_printf ("NtOpenFile (%S) failed, %p",
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dir.get_nt_native_path (), status);
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#endif
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changed_h = INVALID_HANDLE_VALUE;
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}
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else
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{
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status = NtNotifyChangeDirectoryFile (changed_h, NULL, NULL,
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changed_h = INVALID_HANDLE_VALUE;
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}
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else
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{
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status = NtNotifyChangeDirectoryFile (changed_h, NULL, NULL,
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NULL, &io, NULL, 0,
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FILE_NOTIFY_CHANGE_LAST_WRITE
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| FILE_NOTIFY_CHANGE_FILE_NAME,
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FALSE);
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if (!NT_SUCCESS (status))
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{
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if (!NT_SUCCESS (status))
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{
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#ifdef DEBUGGING
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system_printf ("NtNotifyChangeDirectoryFile (1) failed, %p",
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status);
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system_printf ("NtNotifyChangeDirectoryFile (1) failed, "
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"%p", status);
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#endif
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NtClose (changed_h);
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changed_h = INVALID_HANDLE_VALUE;
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NtClose (changed_h);
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changed_h = INVALID_HANDLE_VALUE;
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}
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}
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memset (change_possible, true, sizeof (change_possible));
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}
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memset (change_possible, true, sizeof (change_possible));
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lock.release ();
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}
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if (changed_h == INVALID_HANDLE_VALUE)
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@ -438,7 +438,6 @@ class etc
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{
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friend class dtable;
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static int curr_ix;
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static HANDLE changed_h;
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static bool change_possible[MAX_ETC_FILES + 1];
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static OBJECT_ATTRIBUTES fn[MAX_ETC_FILES + 1];
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static LARGE_INTEGER last_modified[MAX_ETC_FILES + 1];
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