LIBUFF parameter

From m204wiki
Jump to navigation Jump to search

Length of input buffer


Default value
Parameter type
Where set
On User 0's parameter line or in:
  • PARM field in the JCL EXEC statement (z/OS)

    Note: The value set for LIBUFF takes effect immediately, so you must set LIBUFF large enough to accommodate all of the parameter lines in CCAIN; each line is 80 bytes in length.

  • EXEC that issues all the FILEDEFs (z/VM)
  • JCL OPTION statement (z/VSE)
Related products
Model 204 V2.2 or earlier


LIBUFF specifies the length of the input buffer used for input lines from CCAIN or a user's terminal.

The input buffer must be at least three characters longer than the longest anticipated input line. (Long lines are rejected.) LIBUFF also specifies the maximum length allowed for string arguments to Host Language Interface calls from user programs.

If User 0's parameter line is longer than 255 characters, set LIBUFF with the parameters passed by the operating system when Model 204 is invoked. LIBUFF must not exceed 32767.

The value of LIBUFF affects the setting of the User 0 parameter IFAMBS. For the algorithm expressing their relationship, see IFAMBS parameter.

Under z/VSE, you can abbreviate LIBUFF when setting it in the SYSPARM field of the OPTION statement in the JCL. Abbreviating it to LIB allows you to enter a LIBUFF value up to four digits long. The JCL statement takes the form:


where n must be a number greater than 0 and less than or equal to 9999.