2 #include "git-compat-util.h"
4 #if defined(GIT_WINDOWS_NATIVE)
7 static int cmd_sync(void)
11 char szVolumeAccessPath
[] = "\\\\.\\XXXX:";
13 int success
= 0, dos_drive_prefix
;
15 dwRet
= GetCurrentDirectory(MAX_PATH
, Buffer
);
16 if ((0 == dwRet
) || (dwRet
> MAX_PATH
))
17 return error("Error getting current directory");
19 dos_drive_prefix
= has_dos_drive_prefix(Buffer
);
20 if (!dos_drive_prefix
)
21 return error("'%s': invalid drive letter", Buffer
);
23 memcpy(szVolumeAccessPath
, Buffer
, dos_drive_prefix
);
24 szVolumeAccessPath
[dos_drive_prefix
] = '\0';
26 hVolWrite
= CreateFile(szVolumeAccessPath
, GENERIC_READ
| GENERIC_WRITE
,
27 FILE_SHARE_READ
| FILE_SHARE_WRITE
, NULL
, OPEN_EXISTING
, 0, NULL
);
28 if (INVALID_HANDLE_VALUE
== hVolWrite
)
29 return error("Unable to open volume for writing, need admin access");
31 success
= FlushFileBuffers(hVolWrite
);
33 error("Unable to flush volume");
35 CloseHandle(hVolWrite
);
40 #define STATUS_SUCCESS (0x00000000L)
41 #define STATUS_PRIVILEGE_NOT_HELD (0xC0000061L)
43 typedef enum _SYSTEM_INFORMATION_CLASS
{
44 SystemMemoryListInformation
= 80,
45 } SYSTEM_INFORMATION_CLASS
;
47 typedef enum _SYSTEM_MEMORY_LIST_COMMAND
{
48 MemoryCaptureAccessedBits
,
49 MemoryCaptureAndResetAccessedBits
,
50 MemoryEmptyWorkingSets
,
51 MemoryFlushModifiedList
,
52 MemoryPurgeStandbyList
,
53 MemoryPurgeLowPriorityStandbyList
,
55 } SYSTEM_MEMORY_LIST_COMMAND
;
57 static BOOL
GetPrivilege(HANDLE TokenHandle
, LPCSTR lpName
, int flags
)
62 TOKEN_PRIVILEGES tpPreviousState
;
63 TOKEN_PRIVILEGES tpNewState
;
66 bResult
= LookupPrivilegeValueA(0, lpName
, &luid
);
68 tpNewState
.PrivilegeCount
= 1;
69 tpNewState
.Privileges
[0].Luid
= luid
;
70 tpNewState
.Privileges
[0].Attributes
= 0;
71 bResult
= AdjustTokenPrivileges(TokenHandle
, 0, &tpNewState
,
72 (DWORD
)((LPBYTE
)&(tpNewState
.Privileges
[1]) - (LPBYTE
)&tpNewState
),
73 &tpPreviousState
, &dwBufferLength
);
75 tpPreviousState
.PrivilegeCount
= 1;
76 tpPreviousState
.Privileges
[0].Luid
= luid
;
77 tpPreviousState
.Privileges
[0].Attributes
= flags
!= 0 ? 2 : 0;
78 bResult
= AdjustTokenPrivileges(TokenHandle
, 0, &tpPreviousState
,
79 dwBufferLength
, 0, 0);
85 static int cmd_dropcaches(void)
87 HANDLE hProcess
= GetCurrentProcess();
89 DECLARE_PROC_ADDR(ntdll
.dll
, DWORD
, NtSetSystemInformation
, INT
, PVOID
, ULONG
);
90 SYSTEM_MEMORY_LIST_COMMAND command
;
93 if (!OpenProcessToken(hProcess
, TOKEN_QUERY
| TOKEN_ADJUST_PRIVILEGES
, &hToken
))
94 return error("Can't open current process token");
96 if (!GetPrivilege(hToken
, "SeProfileSingleProcessPrivilege", 1))
97 return error("Can't get SeProfileSingleProcessPrivilege");
101 if (!INIT_PROC_ADDR(NtSetSystemInformation
))
102 return error("Could not find NtSetSystemInformation() function");
104 command
= MemoryPurgeStandbyList
;
105 status
= NtSetSystemInformation(
106 SystemMemoryListInformation
,
108 sizeof(SYSTEM_MEMORY_LIST_COMMAND
)
110 if (status
== STATUS_PRIVILEGE_NOT_HELD
)
111 error("Insufficient privileges to purge the standby list, need admin access");
112 else if (status
!= STATUS_SUCCESS
)
113 error("Unable to execute the memory list command %d", status
);
118 #elif defined(__linux__)
120 static int cmd_sync(void)
122 return system("sync");
125 static int cmd_dropcaches(void)
127 return system("echo 3 | sudo tee /proc/sys/vm/drop_caches");
130 #elif defined(__APPLE__)
132 static int cmd_sync(void)
134 return system("sync");
137 static int cmd_dropcaches(void)
139 return system("sudo purge");
144 static int cmd_sync(void)
149 static int cmd_dropcaches(void)
151 return error("drop caches not implemented on this platform");
156 int cmd__drop_caches(int argc
, const char **argv
)
159 return cmd_dropcaches();