Raise OSError on jail(2) failures with the kernel error message - #14
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The jail_set, jail_get, jail_attach and jail_remove wrappers check the return value and raise OSError carrying errno and, where a Jiov is involved, the errmsg the kernel filled in. get_jid_by_name and is_jid_dying keep returning -1 and False for missing jails and raise for every other failure. The JAIL_CREATE, JAIL_UPDATE, JAIL_ATTACH and JAIL_DYING constants replace the magic numbers, while raw access through jail.dll stays available.
Duplicate creation reports EEXIST together with the kernel message, and removing or attaching missing jails reports EINVAL. A child process attaches to a fresh jail and checks that its root moved into the jail path.
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Failures were only visible as negative return codes and an errmsg buffer nobody was required to check.
generic message.