> There is more reliable way. For example.
>
> h = GetProcessWindowStation();
> if (h==NULL) fatal error; /* or return "runs as service" */
> if (GetUserObjectInformationW (h,UOI_NAME,NULL,0,NULL,&len) ||
> GetLastError() != ERROR_INSUFFICIENT_BUFFER)
> fatal error; /* or return "runs as service" */
Complete working snippet below. Note that it return -1 if it didn't
manage to initialize window station, 1 if called in [non interactive]
service context and 0 if called in interactive context. Tested with M$C
and Cygwin gcc. A.
#include <windows.h>
#include <malloc.h>
static const WCHAR *_own_wcsstr(const WCHAR *str,const WCHAR *key)
{ int i;
if (str==NULL || key==NULL || *key==L'\0') return NULL;
for (i=0;*str!=L'\0';str++)
if (*str!=*key) str-=i, key-=i, i=0;
else if (*(++key)==L'\0') return str-i;
else i++;
return NULL;
}
int IsService()
{ HWINSTA h;
DWORD len;
WCHAR *name;
GetDesktopWindow(); /* return value is ignored */
h = GetProcessWindowStation();
if (h==NULL) return -1;
if (GetUserObjectInformationW (h,UOI_NAME,NULL,0,&len) ||
GetLastError() != ERROR_INSUFFICIENT_BUFFER)
return -1;
if (len>512) return -1; /* paranoia */
len++,len&=~1; /* paranoia */
#ifdef _MSC_VER
name=(WCHAR *)_alloca(len+sizeof(WCHAR));
#else
name=(WCHAR *)alloca(len+sizeof(WCHAR));
#endif
if (!GetUserObjectInformationW (h,UOI_NAME,name,len,&len))
return -1;
len++,len&=~1; /* paranoia */
name[len/sizeof(WCHAR)]=L'\0'; /* paranoia */
#if 1
/* This doesn't cover "interactive" services [working with real
* WinSta0's] nor programs started non-interactively by Task
* Scheduler [those are working with SAWinSta]. */
if (_own_wcsstr(name,L"Service-0x"))
#else
/* This covers all non-interactive programs such as services. */
if (!_own_wcsstr(name,L"WinSta0"))
#endif
return 1;
else
return 0;
}
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