What's new for Language Environment® for z/OS Version 1 Release 13

For z/OS Version 1 Release 13, Language Environment has the following changes:


  • Deferred debug support

    Language Environment allows a debugging tool (for example, Debug Tool) to start the debugging session only when a specific subroutine gains control. This support is also available in z/OS V1R10, V1R11, and V1R12 with APAR PM15192.

    For more information, see:


  • BSAM support for large format sequential data sets under binary and text I/O

    Language Environment provides C/C++ run-time support for large format sequential data sets under binary and text I/O opened using BSAM.

    For more information, see:


  • Large file support for MVS data sets

    With large file support in 31-bit applications, you can use the following library functions for 64-bit offsets:

    • fseeko()
    • fseeko_unlocked()
    • ftello()
    • ftello_unlocked()

    For additional information on using fseeko(0 and ftello() for MVS data sets, VSAM data sets, or z/OS UNIX files, see:


  • Globalization

    Language Environment updates locale support for Armenia, Azerbaijan, and Georgia.

    For more information, see:

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