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Annotation of researchv10dc/dist/man/v4/man2/break.2, revision 1.1.1.1

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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