Consolidated Platform Configuration Guide, Cisco Ios Release 15.2(4)E (Catalyst 2960-X Switches - Cisco Catalyst 2960 series Configuration Manual

Arguments
None
Result String
rec_list {{log hist string 0}, {log hist str 1}, ...}
Where each log hist string is:
time_sec %ld time_msec %ld msg {%s}
time_sec time_msec
msg
Set _cerrno
Yes
(_cerr_sub_err = 2)
This error means that the operating system reported an error. The POSIX errno value that is reported with the
error should be used to determine the cause of the operating system error.
(_cerr_sub_err = 22)
This error means that an internal EEM event detector pointer was null when it should have contained a value.
(_cerr_sub_err = 44)
This error means that the history list was empty.
(_cerr_sub_err = 45)
This error means that the event detector sequence or workset number was invalid.
(_cerr_sub_err = 54)
This error means that the event detector was unavailable.

Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)

Seconds and milliseconds since January 1, 1970,
which represent the time the message was logged.
Syslog message.
FH_ESYSERR (generic/unknown error from OS/system)
FH_ENULLPTR (event detector internal error - ptr is null)
FH_EHISTEMPTY (history list is empty)
FH_ESEQNUM (sequence or workset number out of sync)
FH_EFDUNAVAIL (connection to event detector unavailable)
sys_reqinfo_syslog_history
2007