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    SubjectRe: [RFC][v6][PATCH 0/9] clone_with_pids() syscall
    On Friday 11 September 2009, Peter Zijlstra wrote:
    > Why not have something like:
    > struct clone_struct {
    > u32 size;
    > u32 __reserved;
    > u64 flags;
    > u64 child_stack;
    > u32 child_tid;
    > u32 parent_tid;
    > };
    > struct clone_pid_struct {
    > u32 nr;
    > pid_t pids[];
    > };
    > int clone2(struct clone_struct *cs, struct clone_pid_struct *cps);
    > If you then get passed a longer clone_struct than you know about, all is
    > well IFF the tail is 0, otherwise fail with -E2BIG.
    > If you get passed a short clone_struct, zero out the tail.

    I would leave out the size argument. We can put a few reserved fields
    and flag bits in there for possible extensions, but if we ever run out
    of these, just define a new syscall.

    Also, if you're passing a struct, why not put nr_pids in there, and
    replace clone_pid_struct with a simple array? That would give us

    struct clone_struct {
    u64 flags;
    u64 child_stack;
    u32 child_tid;
    u32 parent_tid;
    u32 nr_pids;
    u32 reserved1;
    u64 reserved2;

    int clone2(struct clone_struct *cs, pid_t *pids);

    Arnd <><

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      Last update: 2009-09-11 13:39    [W:0.025 / U:9.672 seconds]
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