You can search for identifiers within the package.
in-package search v0.2.0
type options =
| LOG_PID
| LOG_CONS
| LOG_NDELAY
| LOG_ODELAY
| LOG_NOWAIT
type facility =
| LOG_KERN
| LOG_USER
| LOG_MAIL
| LOG_NEWS
| LOG_UUCP
| LOG_DAEMON
| LOG_AUTH
| LOG_CRON
| LOG_LPR
| LOG_LOCAL0
| LOG_LOCAL1
| LOG_LOCAL2
| LOG_LOCAL3
| LOG_LOCAL4
| LOG_LOCAL5
| LOG_LOCAL6
| LOG_LOCAL7
type level =
| LOG_EMERG
| LOG_ALERT
| LOG_CRIT
| LOG_ERR
| LOG_WARNING
| LOG_NOTICE
| LOG_INFO
| LOG_DEBUG
val setlogmask : level list -> level list
val openlog : ?ident:string -> options list -> facility -> unit
val closelog : unit -> unit
val syslog : ?facility:facility -> level -> ('a, unit, string, unit) format4 -> 'a
val log_upto : level -> level list