Using NS3000/iX Network Services (36920-90008)

152 Chapter 7
Remote Process Management
RPM Program Examples
RPM Program Examples
The following two Pascal programs illustrate the use of the RPM
intrinsics. The first program creates a new process (the second
program) on a remote node. It also creates a remote session for the
second program to run in. At the same time, it passes strings
containing a socket name and a node name to the remote process. This
information enables the second program to establish a connection to the
first.
In greater detail, the first program:
• creates a call socket and names it;
• reads the name of the node on which it is running;
• initializes the opt parameter with strings containing the socket’s
name and the name of the node on which it is running;
• creates a new process with the program name CREATURE on a
remote node, passing the strings to the new process;
• waits for a connection request from the remote process (and
establishes the connection);
• shuts down its call socket;
• executes a loop in which it:
• calls a procedure that receives a message by executing two
IPCRECV loops. The first loop determines the incoming message
length. The second loop receives data until all the pieces of the
message have been received.
• prints the message that was received;
• receives a “last message” termination request;
• sends a “termination confirmation message” in response to the
termination request;
• receives a result parameter value of 64 (“REMOTE ABORTED
CONNECTION”) in response to a receive request;
• releases its VC socket.
The execution of the second program is initiated by the first program.
The second program:
• obtains the socket name and node name passed by the creator;
• uses these names to acquire a destination descriptor for the socket;
• creates a call socket for itself, sends a connection request to the
creator’s socket, and establishes a connection to the creator process;