Input/output processing for tape

 

These considerations apply to I/O operations that are performed on data files.

• Read and write considerations
  You need to consider several aspects of the record length of your program.

• Read considerations
  The system takes specific actions when it does not find an end-of-file label or when it reads a tape block that is not a valid length.

• Force-end-of-data considerations
  The force-end-of-data function is valid for both input and output.

• Force-end-of-volume considerations
  The force-end-of-volume function is valid for both input and output files. It causes volumes to switch immediately, or signals end-of-file if there are no more continuation volumes for an input file.

 

Parent topic:

Tape device files in high-level language programs