BRK(2)                   HP Integral PC                    BRK(2)
     BRK(2)                   HP Integral PC                    BRK(2)
     BRK(2)                   HP Integral PC                    BRK(2)
     BRK(2)                   HP Integral PC                    BRK(2)



     NAME
     NAME
     NAME
     NAME
          brk, sbrk - change data segment space allocation

     SYNOPSIS
     SYNOPSIS
     SYNOPSIS
     SYNOPSIS
          int brk (endds)
          char *endds;

           char *sbrk (incr)
          int incr;

     DESCRIPTION
     DESCRIPTION
     DESCRIPTION
     DESCRIPTION
          Brk and sbrk are used to change dynamically the amount of
          space allocated for the calling process's data segment; see
          exec (2).  The change is made by resetting the process's
          break value.  The break value is the address of the first
          location beyond the end of the data segment.  The amount of
          allocated space increases as the break value increases.

          Brk sets the break value to endds and changes the allocated
          space accordingly.

          Sbrk adds incr bytes to the break value and changes the
          allocated space accordingly.  Incr can be negative, in which
          case the amount of allocated space is decreased.

          Brk and sbrk will fail without making any change in the
          allocated space if such a change would result in more space
          being allocated than is allowed by a system-imposed maximum
          (see ulimit (2)).  [ENOMEM]

     RETURN VALUE
     RETURN VALUE
     RETURN VALUE
     RETURN VALUE
          Upon successful completion, brk returns a value of 0 and
          sbrk returns the old break value.  Otherwise, a value of -1
          is returned and errno is set to indicate the error.

     SEE ALSO
     SEE ALSO
     SEE ALSO
     SEE ALSO
          exec(2).


















     Hewlett-Packard               - 1 -            (printed 12/11/84)