High Quality Content by WIKIPEDIA articles! Brk and sbrk were memory management subroutines/system calls in older versions of the Unix operating system. They operate at a lower level than the standard malloc family of memory management routines, by changing data segment space allocation. The brk and sbrk subroutines dynamically change the amount of space allocated for the data segment of the calling process. (For information about segments, see the exec subroutine. For information about the maximum amount of space that can be allocated, see the ulimit and getrlimit subroutines.) The change is made by resetting the break value of the process, which determines the maximum space that can be allocated. The break value is the address of the first location beyond the current end of the data region. The amount of available space increases as the break value increases. The available space is initialized to a value of 0 at the time it is used. The break value can be automatically rounded up to a size appropriate for the memory management architecture.

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