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Asked: 2026-06-02T15:09:35+00:00

I would like to know in kernel source version >= 2.6 where brk is

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I would like to know in kernel source version >= 2.6 where brk is defined. That is which c file contains its definition? grep is not revealing much. Also sbrk is implemented in glibc correct?

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  1. Editorial Team

    It’s in mmap.c. Look for:

    SYSCALL_DEFINE1(brk, unsigned long, brk)

    The manual page says:

    On Linux, sbrk() is implemented as a library function that uses the
    brk() system call, and does some internal bookkeeping so that it can
    return the old break value.

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