CALL command in the background

Service aids, utilities, and other programs obtaining their input from an allocated file such as SYSIN must have the input in a data set or a job stream data set (one which contains the JCL to run the job and the data itself). After the data set is created, you can use the CALL command to execute the program that accesses the SYSIN data. Figure 1 illustrates the allocation and creation of input data sets. Information about command processing in the foreground and background is described in z/OS TSO/E User's Guide.

Figure 1. Allocating and creating input data sets in the background
//EXAMP1   EXEC    PGM=IKJEFT01,DYNAMNBR=20
//SYSTSPRT DD      SYSOUT=A
//SYSTSIN  DD	   *
  profile prefix(user1)
  allocate file (sysprint) dataset(*)
  allocate file(sysin) altfile(inputdd)
  call (prog1)
  allocate file(sysin) altfile(inputdd2) reuse
  call (prog2)
  free all
//INPUTDD  DD     *
  **input to prog1**
//INPUTDD2 DD     *
  **input to prog2**
/*
Note: Allocating the input file to a terminal results in an I/O error message. Abnormal termination occurs when the program tries to get input from the terminal.
Parent topic: CALL command