Hi,
Perhaps we need to reverse engineer to understand how cd command
works... :) It seems it is not based on SetCurrentDirectory() function.
cmd.exe:
Command:
C:\Documents and Settings\Administrator>cd d:\prg
API call:
GetCurrentDirectoryW(DWORD:260, PWSTR:0x13f80c:"??") 0x4ad041f0
GetCurrentDirectoryW returned 0x27
GetCurrentDirectoryW(DWORD:260, PWSTR:0x4ad34400:"C:\Documents and
Settings\Administrator")
GetCurrentDirectoryW returned 0x27
GetCurrentDirectoryW(DWORD:260, PWSTR:0x4ad34400:"C:\Documents and
Settings\Administrator")
GetCurrentDirectoryW returned 0x27
Conclusion: no SetCurrentDirectory() called!
--------------------------------------------------
Command:
C:\Documents and Settings\Administrator>d:
API call:
SetCurrentDirectoryW(PWSTR:0x4ad2ba20:"D:\PRG")
SetCurrentDirectoryW returned 0x1
GetCurrentDirectoryW(DWORD:260, PWSTR:0x4ad34400:"C:\Documents and
Settings\Administrator")
GetCurrentDirectoryW returned 0x6
GetCurrentDirectoryW(DWORD:260, PWSTR:0x4ad34400:"D:\PRG")
GetCurrentDirectoryW returned 0x6
Conclusion: here SetCurrentDirectory() is called! So, cmd.exe caches cd
instructions for all drives and calls real SetCurrentDirectory() on disk
change.
--------------------------------------------------
Command:
D:\PRG>cd c:
C:\Documents and Settings\Administrator
API call:
GetCurrentDirectoryW(DWORD:260, PWSTR:0x4ad34400:"D:\PRG")
GetCurrentDirectoryW returned 0x6
Conclusion: no SetCurrentDirectoryW() is called at all.
GetCurrentDirectoryW() returned 6 bytes sting (i.e., "D:\PRG"). So
command result (C:\Documents and Settings\Administrator) is printed from
cmd.exe "cache".
Regards,
Mindaugas
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