Undocumented functions of NTDLL

2OO1, 14 February



NtCreateMailslotFile
NtCreateMailslotFile

NTSYSAPI 
NTSTATUS
NTAPI

NtCreateMailslotFile(


  OUT PHANDLE             MailslotFileHandle,
  IN ACCESS_MASK          DesiredAccess,
  IN POBJECT_ATTRIBUTES   ObjectAttributes,
  OUT PIO_STATUS_BLOCK    IoStatusBlock,
  IN ULONG                CreateOptions,
  IN ULONG                MailslotQuota,
  IN ULONG                MaxMessageSize,
  IN PLARGE_INTEGER       ReadTimeOut );



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.


    Documented by:
    Tomasz Nowak
    Bo Branten



    Requirements:
    Library: ntdll.lib


    See also:
    FILE_MAILSLOT_QUERY_INFORMATION
    FILE_MAILSLOT_SET_INFORMATION
    NtQueryInformationFile
    NtReadFile
    NtSetInformationFile
    NtWriteFile