NtCreateMailslotFile - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTIOAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
NtCreateMailslotFile(
    _Out_ PHANDLE FileHandle,
    _In_ ACCESS_MASK DesiredAccess,
    _In_ PCOBJECT_ATTRIBUTES ObjectAttributes,
    _Out_ PIO_STATUS_BLOCK IoStatusBlock,
    _In_ ULONG CreateOptions,
    _In_ ULONG MailslotQuota,
    _In_ ULONG MaximumMessageSize,
    _In_ PLARGE_INTEGER ReadTimeout
    );

#endif

View code on GitHub
#ifndef _NTZWAPI_H

NTSYSCALLAPI
NTSTATUS
NTAPI
ZwCreateMailslotFile(
    _Out_ PHANDLE FileHandle,
    _In_ ACCESS_MASK DesiredAccess,
    _In_ PCOBJECT_ATTRIBUTES ObjectAttributes,
    _Out_ PIO_STATUS_BLOCK IoStatusBlock,
    _In_ ULONG CreateOptions,
    _In_ ULONG MailslotQuota,
    _In_ ULONG MaximumMessageSize,
    _In_ PLARGE_INTEGER ReadTimeout
    );

#endif

View code on GitHub

NtDoc

No description available.

NTinternals.net (undocumented.ntinternals.net)

Function NtCreateMailslotFile creates especial File Object called Mailslot. See Microsoft SDK for more information about Mailslots.

MailslotFileHandle

Result of call - HANDLE to Mailslot File Object.

DesiredAccess

Access rights associated with opened handle.

ObjectAttributes

Pointer to OBJECT_ATTRIBUTES structure contains valid object name. Name must be in format "\\??\MAILSLOT\..." where "..." means unique name of Mailslot.

IoStatusBlock

IO result of call.

CreateOptions

Can be combination of:

MailslotQuota

???

MaxMessageSize

Maximum message size, or MAILSLOT_SIZE_AUTO for automatic message size.

ReadTimeOut

Timeout value, or -1 for infinite waiting.

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See also