If, when a tape input file is opened (OPEN INPUT or REVERSE), BYPASS=LP is specified in the FILE macro or BYPASS-LABEL-CHECK is specified in the ADD-FILE-LINK command, and if the user has the appropriate authorization, all label checks are bypassed. The tape is positioned as specified in the second entry in the BYPASS operand or according to the value specified for the BYPASS-LABEL-CHECK operand, as appropriate.
If the authorization is missing, OPEN processing is aborted with an error message.
Mounting of the tape is monitored by device management in accordance with the user's specifications.
As all label checks are bypassed, the system cannot check which code is used in the file. If the code is neither EBCDIC nor ISO 7-bit code, the user must provide his/her own code table.
If the BYPASS function is specified together with LABEL=NSTD in the macro or with LABEL-TYPE=*NON-STD in the command, only the system checks of the volume header labels are bypassed. The user routines for label handling are activated in the normal manner. The positioning information in the BYPASS operand is evaluated for LABEL=NSTD or LABEL-TYPE=*NON-STD only if there are no UVL labels to check.