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![Ben Peart](/assets/img/avatar_default.png)
On Windows, if a tool calls SetCurrentDirectory with a lower case drive letter, the subsequent call to GetCurrentDirectory will return the same lower case drive letter. Powershell, for example, does not normalize the path. If that happens, test-drop-caches will error out as it does not correctly to handle lower case drive letters. Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Ben Peart <Ben.Peart@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
158 lines
3.7 KiB
C
158 lines
3.7 KiB
C
#include "test-tool.h"
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#include "git-compat-util.h"
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#if defined(GIT_WINDOWS_NATIVE)
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#include "lazyload.h"
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static int cmd_sync(void)
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{
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char Buffer[MAX_PATH];
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DWORD dwRet;
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char szVolumeAccessPath[] = "\\\\.\\X:";
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HANDLE hVolWrite;
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int success = 0;
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dwRet = GetCurrentDirectory(MAX_PATH, Buffer);
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if ((0 == dwRet) || (dwRet > MAX_PATH))
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return error("Error getting current directory");
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if (!has_dos_drive_prefix(Buffer))
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return error("'%s': invalid drive letter", Buffer);
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szVolumeAccessPath[4] = Buffer[0];
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hVolWrite = CreateFile(szVolumeAccessPath, GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
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if (INVALID_HANDLE_VALUE == hVolWrite)
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return error("Unable to open volume for writing, need admin access");
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success = FlushFileBuffers(hVolWrite);
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if (!success)
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error("Unable to flush volume");
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CloseHandle(hVolWrite);
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return !success;
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}
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#define STATUS_SUCCESS (0x00000000L)
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#define STATUS_PRIVILEGE_NOT_HELD (0xC0000061L)
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typedef enum _SYSTEM_INFORMATION_CLASS {
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SystemMemoryListInformation = 80,
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} SYSTEM_INFORMATION_CLASS;
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typedef enum _SYSTEM_MEMORY_LIST_COMMAND {
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MemoryCaptureAccessedBits,
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MemoryCaptureAndResetAccessedBits,
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MemoryEmptyWorkingSets,
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MemoryFlushModifiedList,
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MemoryPurgeStandbyList,
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MemoryPurgeLowPriorityStandbyList,
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MemoryCommandMax
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} SYSTEM_MEMORY_LIST_COMMAND;
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static BOOL GetPrivilege(HANDLE TokenHandle, LPCSTR lpName, int flags)
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{
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BOOL bResult;
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DWORD dwBufferLength;
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LUID luid;
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TOKEN_PRIVILEGES tpPreviousState;
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TOKEN_PRIVILEGES tpNewState;
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dwBufferLength = 16;
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bResult = LookupPrivilegeValueA(0, lpName, &luid);
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if (bResult) {
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tpNewState.PrivilegeCount = 1;
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tpNewState.Privileges[0].Luid = luid;
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tpNewState.Privileges[0].Attributes = 0;
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bResult = AdjustTokenPrivileges(TokenHandle, 0, &tpNewState,
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(DWORD)((LPBYTE)&(tpNewState.Privileges[1]) - (LPBYTE)&tpNewState),
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&tpPreviousState, &dwBufferLength);
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if (bResult) {
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tpPreviousState.PrivilegeCount = 1;
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tpPreviousState.Privileges[0].Luid = luid;
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tpPreviousState.Privileges[0].Attributes = flags != 0 ? 2 : 0;
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bResult = AdjustTokenPrivileges(TokenHandle, 0, &tpPreviousState,
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dwBufferLength, 0, 0);
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}
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}
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return bResult;
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}
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static int cmd_dropcaches(void)
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{
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HANDLE hProcess = GetCurrentProcess();
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HANDLE hToken;
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DECLARE_PROC_ADDR(ntdll.dll, DWORD, NtSetSystemInformation, INT, PVOID, ULONG);
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SYSTEM_MEMORY_LIST_COMMAND command;
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int status;
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if (!OpenProcessToken(hProcess, TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES, &hToken))
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return error("Can't open current process token");
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if (!GetPrivilege(hToken, "SeProfileSingleProcessPrivilege", 1))
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return error("Can't get SeProfileSingleProcessPrivilege");
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CloseHandle(hToken);
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if (!INIT_PROC_ADDR(NtSetSystemInformation))
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return error("Could not find NtSetSystemInformation() function");
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command = MemoryPurgeStandbyList;
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status = NtSetSystemInformation(
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SystemMemoryListInformation,
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&command,
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sizeof(SYSTEM_MEMORY_LIST_COMMAND)
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);
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if (status == STATUS_PRIVILEGE_NOT_HELD)
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error("Insufficient privileges to purge the standby list, need admin access");
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else if (status != STATUS_SUCCESS)
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error("Unable to execute the memory list command %d", status);
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return status;
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}
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#elif defined(__linux__)
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static int cmd_sync(void)
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{
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return system("sync");
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}
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static int cmd_dropcaches(void)
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{
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return system("echo 3 | sudo tee /proc/sys/vm/drop_caches");
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}
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#elif defined(__APPLE__)
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static int cmd_sync(void)
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{
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return system("sync");
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}
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static int cmd_dropcaches(void)
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{
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return system("sudo purge");
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}
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#else
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static int cmd_sync(void)
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{
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return 0;
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}
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static int cmd_dropcaches(void)
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{
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return error("drop caches not implemented on this platform");
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}
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#endif
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int cmd__drop_caches(int argc, const char **argv)
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{
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cmd_sync();
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return cmd_dropcaches();
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}
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