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23b1400f83
This patch unifies the layout of the clipboard descriptor cygcb_t for 32- and 64-bit Cygwin. It allows correct copy/paste between the two environments without corruption of user's copied data and without access violations due to interpreting that data as a size field. The definitions of CYGWIN_NATIVE and cygcb_t are moved to a new include file, sys/clipboard.h. The include file is used by fhandler_clipboard.cc as well as getclip.c and putclip.c in the Cygwin cygutils package. When copy/pasting between 32- and 64-bit Cygwin environments, both must be running version 3.3.0 or later for successful operation.
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/* sys/clipboard.h
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#ifndef _SYS_CLIPBOARD_H_
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#define _SYS_CLIPBOARD_H_
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/*
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* These definitions are used in fhandler_clipboard.cc
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* as well as in the Cygwin cygutils package, specifically
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* getclip.c and putclip.c.
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*/
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static const WCHAR *CYGWIN_NATIVE = L"CYGWIN_NATIVE_CLIPBOARD";
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/*
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* The following layout of cygcb_t is new with Cygwin 3.3.0. It aids in the
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* transfer of clipboard contents between 32- and 64-bit Cygwin environments.
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*/
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typedef struct
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{
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union
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{
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/*
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* Note that ts below overlays the struct following it. On 32-bit Cygwin
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* timespec values have to be converted to|from cygcb_t layout. On 64-bit
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* Cygwin timespec values perfectly conform to the struct following, so
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* no conversion is needed.
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*
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* We avoid directly using 'struct timespec' or 'size_t' here because they
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* are different sizes on different architectures. When copy/pasting
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* between 32- and 64-bit Cygwin, the pasted data could appear corrupted,
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* or partially interpreted as a size which can cause an access violation.
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*/
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struct timespec ts; // 8 bytes on 32-bit Cygwin, 16 bytes on 64-bit Cygwin
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struct
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{
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uint64_t cb_sec; // 8 bytes everywhere
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uint64_t cb_nsec; // 8 bytes everywhere
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};
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};
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uint64_t cb_size; // 8 bytes everywhere
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} cygcb_t;
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#endif
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