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