proposed libc interface and man page for statmount(2)

[Miklos Szeredi <miklos@szeredi.hu>]

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Hi,

Attaching the proposed man page for the new statmount() syscall.

It describes a libc interface that is slightly different from the raw
kernel API.   The differences from the two API's are also described in
the man page.

Raw:

       long syscall(SYS_statmount, const struct mnt_id_req *req,
                    struct statmount *buf, size_t bufsize, unsigned int flags);

Libc:

       struct statmount *statmount(uint64_t mnt_id, uint64_t request_mask,
                                   struct statmount *buf, size_t bufsize,
                                   unsigned int flags);

I propose the libc one to allow automatically allocating the buffer if
the buf argument is NULL, similar to getcwd(3).

Comments?

Thanks,
Miklos

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