#ifndef _NTIOAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)

// pub
typedef struct _MAILSLOT_CREATE_PARAMETERS
{
    ULONG MailslotQuota;
    ULONG MaximumMessageSize;
    LARGE_INTEGER ReadTimeout;
    BOOLEAN TimeoutSpecified;
} MAILSLOT_CREATE_PARAMETERS, *PMAILSLOT_CREATE_PARAMETERS;

#endif
#endif
View code on GitHub

// wdm.h

typedef struct _MAILSLOT_CREATE_PARAMETERS {
  ULONG         MailslotQuota;
  ULONG         MaximumMessageSize;
  LARGE_INTEGER ReadTimeout;
  BOOLEAN       TimeoutSpecified;
} MAILSLOT_CREATE_PARAMETERS, *PMAILSLOT_CREATE_PARAMETERS;
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ns-wdm-_mailslot_create_parameters)

_MAILSLOT_CREATE_PARAMETERS structure

Description

The MAILSLOT_CREATE_PARAMETERS is used by the Windows subsystem to create a mailslot.

Members

`MailslotQuota`

Pool quota that is reserved for writes to this mailslot.

`MaximumMessageSize`

Size, in bytes, of the largest message that can be written to this mailslot.

`ReadTimeout`

The timeout period for the read operation, specified as a relative time.

`TimeoutSpecified`

Boolean value that specifies whether a timeout period was provided in the ReadTimeout member.

Remarks

For an IRP_MJ_CREATE_MAILSLOT operation, FLT_PARAMETERS is a CreateMailslot structure, and CreateMailslot.Parameters points to a MAILSLOT_CREATE_PARAMETERS structure that describes the mailslot to create or open.

MAILSLOT_CREATE_PARAMETERS - NtDoc