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    1. POHow to mmap the stack for the clone() system call on linux?
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    1. USLogan Capaldo
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    1. COMy point is that it should be able to "find a bunch of free memory" because it apparently it *already can* "find a bunch of free memory." Fork creates a new process, which is different, and I know I could abstract any detail away by using a library. But I'm giving the kernel developers credit and assuming there's good reason for things to work this way, and I want to know why.
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      1. USJoseph Garvin
    2. COfork (exec really, since fork just copies everything) are the "find me a bunch of free memory" functions. `clone` is the "I want to control the details of my process creation" function. pthread_create is the "create me a thread, use the defaults" function. These are your choices. New threads need their own stack, and you can't use the traditional method of allocating stack (start at the top/bottom of the (user) address space and grown down/up towards the heap which is growing the other way), because there's only one top/bottom of the address space.
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      1. USLogan Capaldo
    3. COMy point is that when the user forks a process, even though that process gets its own memory space, at some level the kernel has to be doing memory management of the *physical* address space that the process-specific address spaces map into. If it can do that, it should have the logic to be able to handle letting me clone but handle the stack for me. I might want to use clone for reasons that don't have anything to do with stacks for example (see the clone flags).
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