- [!]postread[=<attrs>] (a comma-separated attribute list)
- [!]preread[=<attrs>] (a comma-separated attribute list)
- abandon, cancel (SIGINT sends abandon/cancel; not really controls)
+ [!]postread[=<attrs>] (a comma-separated attribute list)
+ [!]preread[=<attrs>] (a comma-separated attribute list)
+ [!]relax
+ sessiontracking[=<username>]
+ abandon,cancel,ignore (SIGINT sends abandon/cancel,
+ or ignores response; if critical, doesn't wait for SIGINT.
+ not really controls)