Example of Using a Direct Monitor Handler and Signal Handler Together

The following example shows you how to use the #pragma exception_handler directive and the signal() function together. This example also shows how an exception is handled using SIGIO. An end-of-file message is mapped to SIGIO. The default for SIGIO is SIG_IGN. It also shows that when both a HLL-specific handler and direct monitor handler are defined, the direct monitor handler is called first.

This example uses the source shown in Example of Source that Illustrates How to Use Direct Monitor Handlers.
  1. To create the program T1520ICA, enter: 
    CRTBNDC PGM(MYLIB/T1520ICA) SRCFILE(QCPPLE/QACSRC)
  2. To run the program T1520ICA, enter: 
    CALL PGM(MYLIB/T1520ICA)
    The first screen of output is shown below: 
      The first read starts
  Read record 1
  Read record 2
  Read record 3
  Read record 4
  Read record 5
  The first read finishes
  The second read starts
  Read record 1
  Read record 2
  Read record 3
  Read record 4
  Read record 5
  In direct monitor handler
  Exception message ID is CPF5001
  The second read finishes
  The third read starts
  Read record 1
    The second screen of output follows: 
      Read record 2
  Read record 3
  Read record 4
  Read record 5
  In direct monitor handler
  Exception message ID is CPF5001
  In signal handler
  Exception message ID is CPF5001
  The third read finishes
  The fourth read starts
  Read record 1
  Read record 2
  Read record 3
  Read record 4
  Read record 5
  In signal handler
  Exception message ID is CPF5001
  The fourth read finishes
  Press ENTER to end terminal session.
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 F3=Exit F4=End of File F6=Print F9=Retrieve F17=Top
 F18=Bottom  F19=Left   F20=Right F21=User Window