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Annotation of researchv10dc/dist/man/v4/man2/break.2, revision 1.1

1.1     ! root        1: .th BREAK II 8/5/73
        !             2: .sh NAME
        !             3: break \*- set program break
        !             4: .sh SYNOPSIS
        !             5: (break = 17.)
        !             6: .br
        !             7: .ft B
        !             8: sys break; addr
        !             9: .s3
        !            10: char *sbrk(incr)
        !            11: .ft R
        !            12: .sh DESCRIPTION
        !            13: .it Break
        !            14: sets the system's idea of the lowest location not used by the program
        !            15: to
        !            16: .it addr
        !            17: (rounded up to the next multiple of 64 bytes).
        !            18: Locations not less than
        !            19: .it addr
        !            20: and below the stack pointer
        !            21: are not in the address space and will thus
        !            22: cause a memory violation if accessed.
        !            23: .s3
        !            24: From C, the calling sequence is different;
        !            25: .it incr
        !            26: more bytes are added to the
        !            27: program's data space and a pointer to the
        !            28: start of the new area is returned.
        !            29: .s3
        !            30: When a program begins execution via
        !            31: .it exec
        !            32: the break is set at the
        !            33: highest location defined by the program
        !            34: and data storage areas.
        !            35: Ordinarily, therefore, only programs with growing
        !            36: data areas need to use
        !            37: .it break.
        !            38: .sh "SEE ALSO"
        !            39: exec(II)
        !            40: .sh DIAGNOSTICS
        !            41: The c-bit is set if the program requests more
        !            42: memory than the system limit
        !            43: (currently 20K words),
        !            44: or if more than 8 segmentation
        !            45: registers would be required to implement the break.
        !            46: From C, \*-1 is returned for these errors.

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