Messages in this thread | | | Date | Tue, 7 Jun 2005 01:53:19 -0700 | From | Ulrich Drepper <> | Subject | Re: Zeroed pages returned for heap |
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On 6/6/05, Nagendra Singh Tomar <nagendra_tomar@adaptec.com> wrote: > Is it OK for an application (a C library implementing malloc/calloc is > also an application) to assume that the pages returned by the OS for heap > allocation (either directly thru brk() or thru mmap(MAP_ANONYMOUS)) will > be zero filled.
The malloc code is glibc is defined with the assumption that brk clears memory. Since this is what the kernel implements it would be a horrible waste of time to reinitialize the memory. This behavior is part of the kernel ABI and cannot be changed without breaking existing applications without producing new libc DSOs (set MORECORE_CLEARS appropriately) and relinking all statically linked apps. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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