sbrk man page on HP-UX

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brk(2)									brk(2)

       brk, sbrk - change data segment space allocation

       and  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	and allocating the appropriate
       amount of space.	 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.	The newly allocated  space  is
       set to zero.

       sets  the  break value to endds and changes the allocated space accord‐

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

       and fail without making any change in the allocated  space  if  one  or
       more of the following are true:

       [ENOMEM]	      Such a change would result in more space being allocated
		      than  is	allowed	 by  a	system-imposed	maximum	  (see

       [ENOMEM]	      Such  a  change would cause a conflict between addresses
		      in the data segment and any attached shared memory  seg‐
		      ment (see shmop(2)).

       [ENOMEM]	      Such  a  change would be impossible as there is insuffi‐
		      cient swap space available.

       [EINVAL]	      Such a change will result in crossing  the  boundary  to
		      uninitialized  data  in  the calling process's data seg‐

       The pointer returned by is not necessarily  word-aligned.   Loading  or
       storing words through this pointer could cause word alignment problems.

       Be  very	 careful when using either or in conjunction with calls to the
       malloc(3C) library routines.  There is only one	program	 data  segment
       from  which all three of these routines allocate and deallocate program
       data memory.

       Upon successful completion, returns a value of 0. Otherwise, a value of
       −1 is returned and is set to indicate the error.

       Upon  successful completion, returns the old break value. Otherwise, is
       returned and is set to indicate the error. The symbol is defined in the
       header No successful return from will return the value

       and were developed by AT&T and HP.

       exec(2), shmop(2), ulimit(2), end(3C), malloc(3C).


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