Mailslots and Microsoft LAN Manager 2.x
Windows uses mailslots similar to those developed for Microsoft LAN Manager
version 2.0. An application that uses LAN Manager 2.
x mailslots can interact easily with mailslots created by Windows. There are
significant differences, however, between Windows-based mailslots and LAN Manager
mailslots:
- Windows-based mailslots all have the same class
there are no "first class" and "second class" mailslots.
- All Windows-based mailslot messages have equal priority and are always
appended to the mailslot buffer. When a Windows-based mailslot message is written to a
mailslot on a computer that requires message priority, the system sets the
priority to the lowest value (0).
- Write operations to Windows-based mailslots on local computers return an error
value if an error occurs. Write operations to remote Windows-based mailslots
do not return an error value when they fail. (Because there is no built-in limit
to the size of the mailslot buffer failure is unlikely.)
- Write operations to Windows-based mailslots fail immediately if the message
cannot be appended to the mailslot buffer (if the buffer is too small, for
example). Immediate failure makes write time-outs irrelevant; contrary to LAN Manager
mailslots, there are no write time-outs for Windows-based mailslots.
- A process that creates a Windows-based mailslot can specify that the mailslot
handle be inherited by its child processes. (Mailslot handles in LAN Manager
cannot be inherited.)
A process writes messages to a Windows-based mailslot by using standard file
input and output functions. The following table shows LAN Manager mailslot
functions and their corresponding Windows functions.
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