Exchange/RJE Manual

OPEN Procedure
Exchange/RJE System Procedure Calls
104698 Tandem Computers Incorporated 5–21
Assuming your program will both send and receive data, specify 0 for
read/write access.
.<6:7> Must be 0.
.<8> Specifies whether the open message is sent to the Exchange/RJE line
server in nowait I/O mode or not.
0 = The open message is sent in wait I/O mode. The open operation is
complete when control is returned to your program.
1 = The open message is sent in nowait I/O mode. The open operation
must be completed by a subsequent call to AWAITIO.
.<9> Must be 0.
.<10:11> Specifies the exclusion mode in which the Exchange/RJE line server is
opened. Regardless of the mode you specify, the Exchange/RJE line
server allows only one open at a time (exclusive mode). If you want
your program to reflect this limit in its code, set flags .<10:11> to 1,
which specifies exclusive mode.
.<12:15> Specifies whether you want to perform wait or nowait I/O operations
with the Exchange/RJE line server.
0 = Wait I/O operations. I/O operations will complete before control is
returned to your program.
1 = Nowait I/O operations. I/O operations must be completed by a
subsequent call to AWAITIO. The Exchange/RJE line server allows
only one outstanding nowait I/O operation at a time. If you
specify a number greater than 1, an error is returned by the call to
OPEN.
If you omit this parameter, the default value is all bits equal to 0. The default
value results in the following:
Read/write access
The open message sent in wait I/O mode
Exclusive access (determined by the line server, not the value specified in
flags )
Wait I/O operations
Line Activity None.