[PATCH v3 0/3] syslogd: Add a configurable option to log timestamps in ISO 8601 format

[Grant Erickson]

Denys:

Any thoughts on this patch?

Best,

Grant


-- 
Principal
Nuovations

gerickson at nuovations.com
https://www.nuovations.com/


On Apr 4, 2025, at 9:58 AM, Grant Erickson <gerickson at nuovations.com> wrote:
> 
> 
> This provides unification for the several syslogd options that
> influence handling and formatting of log timestamps and adds a new
> configuration and option.
> 
> First, this unifies the handling of messages with a client-generated
> timestamps when both 'FEATURE_SYSLOGD_PRECISE_TIMESTAMPS' and
> 'FEATURE_SYSLOGD_UTC' are asserted.
> 
> In particular, to support the intermix of client-generated and
> server-generated timestamps, the former are zero-padded such that the
> timestamp "column" of a log file is consistent in format.
> 
> Second, this adds a configurable option 'FEATURE_SYSLOGD_ISO8601FMT' enabling
> a command line option ('-I', with semantics similar to 'date') that
> directs syslogd to log timestamps in ISO 8601 format.
> 
> Precision in seconds (the default), milliseconds, and microseconds are
> supported. Without the 'FEATURE_SYSLOGD_UTC' configuration and its
> '-u' option, outputs are of the form:
> 
>  YYYY-MM-DDThh:mm:ss±hhmm (seconds)
>  YYYY-MM-DDThh:mm:ss.sss±hhmm (milliseconds)
>  YYYY-MM-DDThh:mm:ss.uuuuuu±hhmm (microseconds)
> 
> with the 'FEATURE_SYSLOGD_UTC' configuration and its '-u' option,
> outputs are of the form:
> 
>  YYYY-MM-DDThh:mm:ssZ (seconds)
>  YYYY-MM-DDThh:mm:ss.sssZ (milliseconds)
>  YYYY-MM-DDThh:mm:ss.uuuuuuZ (microseconds)
> 
> With all three of the follow options asserted:
> 
>  * FEATURE_SYSLOGD_PRECISE_TIMESTAMPS
>  * FEATURE_SYSLOGD_UTC
>  * FEATURE_SYSLOGD_ISO8601FMT
> 
> there are a total of twenty (20) possible test cases of which sixteen
> (16) are unique (several of which are defaults):
> 
>    1. syslogd -O - -n
>    2. syslogd -O - -n -u
>    3. syslogd -O - -n -I
>    4. syslogd -O - -n -Is
>    5. syslogd -O - -n -Ims
>    6. syslogd -O - -n -Ius
>    7. syslogd -O - -n -I -u
>    8. syslogd -O - -n -Is -u
>    9. syslogd -O - -n -Ims -u
>    10. syslogd -O - -n -Ius -u
>    11. syslogd -O - -n -t
>    12. syslogd -O - -n -t -u
>    13. syslogd -O - -n -t -I
>    14. syslogd -O - -n -t -Is
>    15. syslogd -O - -n -t -Ims
>    16. syslogd -O - -n -t -Ius
>    17. syslogd -O - -n -t -I -u
>    18. syslogd -O - -n -t -Is -u
>    19. syslogd -O - -n -t -Ims -u
>    20. syslogd -O - -n -t -Ius -u
> 
> which result in the following test output, generated interactively
> with 'logger' over ssh:
> 
> [ … ]
> 
> -- 
> 2.45.0