`*xattrat` syscalls

[rusty-snake]

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Linux 6.13 added *at variants of xattr syscalls:

• [ ] struct xattr_args
• [ ] setxattrat
• [ ] getxattrat
• [ ] listxattrat
• [ ] removexattrat

struct xattr_args { value, size, flags };
setxattrat(dfd: c_int, pathname: *const c_char, at_flags: c_uint, name: *const c_char, args: *const xattr_args, size: c_size_t);
getxattrat(dfd: c_int, path: *const c_char, at_flags: c_uint, name: *const c_char, args: *const xattr_args, size: c_size_t);
listxattrat(dfd: c_int, path: *const c_char, at_flags: c_uint, list: *mut c_char, size: c_size_t);
removexattrat(dfd: int, path: *const c_char, at_flags: c_uint, name: *const c_char);