| 1 | #define DISABLE_SIGN_COMPARE_WARNINGS |
| 2 | |
| 3 | #include "test-tool.h" |
| 4 | #include "git-compat-util.h" |
| 5 | |
| 6 | #if defined(GIT_WINDOWS_NATIVE) |
| 7 | #include "lazyload.h" |
| 8 | #include <winnt.h> |
| 9 | |
| 10 | static int cmd_sync(void) |
| 11 | { |
| 12 | char Buffer[MAX_PATH]; |
| 13 | DWORD dwRet; |
| 14 | char szVolumeAccessPath[] = "\\\\.\\XXXX:"; |
| 15 | HANDLE hVolWrite; |
| 16 | int success = 0, dos_drive_prefix; |
| 17 | |
| 18 | dwRet = GetCurrentDirectory(MAX_PATH, Buffer); |
| 19 | if ((0 == dwRet) || (dwRet > MAX_PATH)) |
| 20 | return error("Error getting current directory"); |
| 21 | |
| 22 | dos_drive_prefix = has_dos_drive_prefix(Buffer); |
| 23 | if (!dos_drive_prefix) |
| 24 | return error("'%s': invalid drive letter", Buffer); |
| 25 | |
| 26 | memcpy(szVolumeAccessPath, Buffer, dos_drive_prefix); |
| 27 | szVolumeAccessPath[dos_drive_prefix] = '\0'; |
| 28 | |
| 29 | hVolWrite = CreateFile(szVolumeAccessPath, GENERIC_READ | GENERIC_WRITE, |
| 30 | FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL); |
| 31 | if (INVALID_HANDLE_VALUE == hVolWrite) |
| 32 | return error("Unable to open volume for writing, need admin access"); |
| 33 | |
| 34 | success = FlushFileBuffers(hVolWrite); |
| 35 | if (!success) |
| 36 | error("Unable to flush volume"); |
| 37 | |
| 38 | CloseHandle(hVolWrite); |
| 39 | |
| 40 | return !success; |
| 41 | } |
| 42 | |
| 43 | #define STATUS_SUCCESS (0x00000000L) |
| 44 | #define STATUS_PRIVILEGE_NOT_HELD (0xC0000061L) |
| 45 | |
| 46 | typedef enum _SYSTEM_INFORMATION_CLASS { |
| 47 | SystemMemoryListInformation = 80, |
| 48 | } SYSTEM_INFORMATION_CLASS; |
| 49 | |
| 50 | typedef enum _SYSTEM_MEMORY_LIST_COMMAND { |
| 51 | MemoryCaptureAccessedBits, |
| 52 | MemoryCaptureAndResetAccessedBits, |
| 53 | MemoryEmptyWorkingSets, |
| 54 | MemoryFlushModifiedList, |
| 55 | MemoryPurgeStandbyList, |
| 56 | MemoryPurgeLowPriorityStandbyList, |
| 57 | MemoryCommandMax |
| 58 | } SYSTEM_MEMORY_LIST_COMMAND; |
| 59 | |
| 60 | static BOOL GetPrivilege(HANDLE TokenHandle, LPCSTR lpName, int flags) |
| 61 | { |
| 62 | BOOL bResult; |
| 63 | DWORD dwBufferLength; |
| 64 | LUID luid; |
| 65 | TOKEN_PRIVILEGES tpPreviousState; |
| 66 | TOKEN_PRIVILEGES tpNewState; |
| 67 | |
| 68 | dwBufferLength = 16; |
| 69 | bResult = LookupPrivilegeValueA(0, lpName, &luid); |
| 70 | if (bResult) { |
| 71 | tpNewState.PrivilegeCount = 1; |
| 72 | tpNewState.Privileges[0].Luid = luid; |
| 73 | tpNewState.Privileges[0].Attributes = 0; |
| 74 | bResult = AdjustTokenPrivileges(TokenHandle, 0, &tpNewState, |
| 75 | (DWORD)((LPBYTE)&(tpNewState.Privileges[1]) - (LPBYTE)&tpNewState), |
| 76 | &tpPreviousState, &dwBufferLength); |
| 77 | if (bResult) { |
| 78 | tpPreviousState.PrivilegeCount = 1; |
| 79 | tpPreviousState.Privileges[0].Luid = luid; |
| 80 | tpPreviousState.Privileges[0].Attributes = flags != 0 ? 2 : 0; |
| 81 | bResult = AdjustTokenPrivileges(TokenHandle, 0, &tpPreviousState, |
| 82 | dwBufferLength, 0, 0); |
| 83 | } |
| 84 | } |
| 85 | return bResult; |
| 86 | } |
| 87 | |
| 88 | static int cmd_dropcaches(void) |
| 89 | { |
| 90 | HANDLE hProcess = GetCurrentProcess(); |
| 91 | HANDLE hToken; |
| 92 | DECLARE_PROC_ADDR(ntdll.dll, DWORD, NTAPI, NtSetSystemInformation, INT, PVOID, |
| 93 | ULONG); |
| 94 | SYSTEM_MEMORY_LIST_COMMAND command; |
| 95 | int status; |
| 96 | |
| 97 | if (!OpenProcessToken(hProcess, TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES, &hToken)) |
| 98 | return error("Can't open current process token"); |
| 99 | |
| 100 | if (!GetPrivilege(hToken, "SeProfileSingleProcessPrivilege", 1)) |
| 101 | return error("Can't get SeProfileSingleProcessPrivilege"); |
| 102 | |
| 103 | CloseHandle(hToken); |
| 104 | |
| 105 | if (!INIT_PROC_ADDR(NtSetSystemInformation)) |
| 106 | return error("Could not find NtSetSystemInformation() function"); |
| 107 | |
| 108 | command = MemoryPurgeStandbyList; |
| 109 | status = NtSetSystemInformation( |
| 110 | SystemMemoryListInformation, |
| 111 | &command, |
| 112 | sizeof(SYSTEM_MEMORY_LIST_COMMAND) |
| 113 | ); |
| 114 | if (status == STATUS_PRIVILEGE_NOT_HELD) |
| 115 | error("Insufficient privileges to purge the standby list, need admin access"); |
| 116 | else if (status != STATUS_SUCCESS) |
| 117 | error("Unable to execute the memory list command %d", status); |
| 118 | |
| 119 | return status; |
| 120 | } |
| 121 | |
| 122 | #elif defined(__linux__) |
| 123 | |
| 124 | static int cmd_sync(void) |
| 125 | { |
| 126 | return system("sync"); |
| 127 | } |
| 128 | |
| 129 | static int cmd_dropcaches(void) |
| 130 | { |
| 131 | return system("echo 3 | sudo tee /proc/sys/vm/drop_caches"); |
| 132 | } |
| 133 | |
| 134 | #elif defined(__APPLE__) |
| 135 | |
| 136 | static int cmd_sync(void) |
| 137 | { |
| 138 | return system("sync"); |
| 139 | } |
| 140 | |
| 141 | static int cmd_dropcaches(void) |
| 142 | { |
| 143 | return system("sudo purge"); |
| 144 | } |
| 145 | |
| 146 | #else |
| 147 | |
| 148 | static int cmd_sync(void) |
| 149 | { |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | static int cmd_dropcaches(void) |
| 154 | { |
| 155 | return error("drop caches not implemented on this platform"); |
| 156 | } |
| 157 | |
| 158 | #endif |
| 159 | |
| 160 | int cmd__drop_caches(int argc UNUSED, const char **argv UNUSED) |
| 161 | { |
| 162 | cmd_sync(); |
| 163 | return cmd_dropcaches(); |
| 164 | } |