HELPLIB.HLB  —  CRTL  sbrk  Description
    The sbrk function adds the number of bytes specified by its
    argument to the current break address and returns the old break
    address.

    When a program is executed, the break address is set to the
    highest location defined by the program and data storage areas.
    Consequently, sbrk is needed only by programs that have growing
    data areas.

    sbrk(0) returns the current break address.
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