PROCESS_MEMBERSHIP_INFORMATION - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTPSAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)

//typedef struct _PROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGE
//{
//    ULONG_PTR BaseAddress;
//    SIZE_T Size;
//    ULONG Flags;
//} PROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGE, *PPROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGE;
//
//typedef struct _PROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGES_INFORMATION
//{
//    USHORT NumberOfRanges;
//    USHORT Reserved;
//    ULONG Reserved2;
//    PPROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGE Ranges;
//} PROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGES_INFORMATION, *PPROCESS_DYNAMIC_ENFORCED_ADDRESS_RANGES_INFORMATION;

/**
 * The PROCESS_MEMBERSHIP_INFORMATION structure contains the Silo identifier of the process.
 *
 * \remarks https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/ntddk/ns-ntddk-process_membership_information
 */
typedef struct _PROCESS_MEMBERSHIP_INFORMATION
{
    ULONG ServerSiloId;
} PROCESS_MEMBERSHIP_INFORMATION, *PPROCESS_MEMBERSHIP_INFORMATION;

#endif
#endif

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This structure is documented in Windows Driver Kit.