Hitachi MK-96RD647-01 manual FAL/FCU Pipe Function Details

FAL/FCU Pipe Function Details

FCU can carry out data transmission to a pipe file. A user application opens and reads this pipe file, and a direct data transmission is attained between the application and FCU. There is no need for it to be output as a file on an HDD.

A named-pipe name is specified in a parameter definition file as the output file name. “PIPE=Yes” needs to be specified as an option. Under these conditions, FCU will open a pipe file with the specified output file name, and will transmit data to it.

If the specified file exists as a standard UNIX file, FCU re-creates a pipe file using the same name (the UNIX file is deleted.) Since FCU only inputs in data to a pipe, the FCU function needs to obtain the data via a user application. If data remains in the pipe, FCU will stop and processing does not progress to the next step. The FCU function has an inbuilt timer. If the application does not continue receiving data, FCU will send an error message after a certain set time, and it will progress to the next logical process.

Note: This function is only supported for UNIX systems. It is not supported for Windows 2000/2003/Windows NT. It is supported for mainframe to open systems data transfer only. This function requires an application program or a utility program to receive data entries using a named pipe.

Pipe Function Time-Out Value

•FCU waits for a “Read Data Entries” status message. A time-out error will be reported if the TIME OUT VALUE is not set appropriately. The TIME OUT VALUE should be set in the WAIT_TIME_VALUE environment variable. The limits are 0~1440 seconds (0 = unlimited). The default value is 10 when the timeout value is undefined.

•The following examples illustrate the use of the WAIT_TIME_VALUE environment variable.

Note: After setting the variable, log out and log in again to establish the variable’s value.

•Example 1: For C shell:

–Add “setenv WAIT_TIME_VALUE 300” to the file“.cshrc” in the home directory.

–If “.cshrc” does not exist, create it and add the “setenv” line.

•Example 2: For non-C shell:

–Add “WAIT_TIME_VALUE=300"

–Add "export WAIT_TIME_VALUE"

	These two commands must be added to the file “.dtprofile” in the home
	directory. If “.dtprofile” does not exist, create it and add the lines.
2-12	About Cross-OS File Exchange Operations
	Hitachi USP V Cross-OS File Exchange User’s Guide