V1/man/man2/break.2

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        11/3/71                                                SYS BREAK (II)


NAME              break -- set program break

SYNOPSIS          sys        break; addr       / break = 17.

DESCRIPTION       break sets the system's idea of the highest location used
                  by the program to addr. Locations greater than addr and
                  below the stack pointer are not swapped and are thus
                  liable to unexpected modification.

                  If the argument is 0 or higher than the stack pointer the
                  entire 4K word user core area is swapped.

                  When a program begins execution via exec the break is set,
                  at the highest location defined by the program and data
                  storage areas. Ordinarily, therefore, only programs with
                  growing data areas need to use break.

FILES

SEE ALSO          exec

DIAGNOSTICS       none; strange addresses cause the break to be set to
                  include all of core.

BUGS

OWNER             ken, dmr