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flush file cache on Windows
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// clang.exe -Os -fno-unwind-tables -nostdlib -fuse-ld=lld -Wl,-fixed,-merge:.rdata=.text,-subsystem:console FlushFileCache.c -o FlushFileCache.exe | |
#define WIN32_LEAN_AND_MEAN | |
#include <windows.h> | |
#pragma comment (lib, "kernel32.lib") | |
#pragma comment (lib, "advapi32.lib") | |
#define error(str) do { DWORD written; WriteFile(GetStdHandle(STD_ERROR_HANDLE), str, sizeof(str)-1, &written, NULL); } while (0) | |
static BOOL SetPrivilege(LPCSTR name) | |
{ | |
BOOL result = FALSE; | |
HANDLE token; | |
if (OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &token)) | |
{ | |
LUID luid; | |
if (LookupPrivilegeValueA(NULL, name, &luid)) | |
{ | |
TOKEN_PRIVILEGES tp = | |
{ | |
.PrivilegeCount = 1, | |
.Privileges[0].Luid = luid, | |
.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED, | |
}; | |
if (AdjustTokenPrivileges(token, FALSE, &tp, sizeof(tp), NULL, NULL)) | |
{ | |
result = TRUE; | |
} | |
} | |
CloseHandle(token); | |
} | |
return result; | |
} | |
int mainCRTStartup(void) | |
{ | |
if (!SetPrivilege(SE_INCREASE_QUOTA_NAME)) | |
{ | |
error("Cannot set needed privilege!\n"); | |
return 1; | |
} | |
if (!SetSystemFileCacheSize((SIZE_T)-1, (SIZE_T)-1, 0)) | |
{ | |
DWORD err = GetLastError(); | |
if (err == ERROR_ACCESS_DENIED) | |
{ | |
error("Access denied! Is process elevated?\n"); | |
} | |
else | |
{ | |
error("SetSystemFileCacheSize failed!\n"); | |
} | |
return 1; | |
} | |
return 0; | |
} |
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