[libvirt] [PATCH v2] Add systemd journal support

[Eric Blake]

On 09/28/2012 07:08 AM, Daniel P. Berrange wrote:
> From: "Daniel P. Berrange" <berrange at redhat.com>
> 
> Add support for logging to the systemd journal, using its
> simple client library. The benefit over syslog is that it
> accepts structured log data, so the journald can store
> individual items like code file/line/func separately from
> the string message. Tools which require structured log
> data can then query the journal to extract exactly what
> they desire without resorting to string parsing
> 
> While systemd provides a simple client library for logging,
> it is more convenient for libvirt to directly write its
> own client code. This lets us build up the iovec's on
> the stack, avoiding the need to alloc memory when writing
> log messages.
> 
> Changed in v2:
> 
>  - Add virFormatIntDecimal instead of using snprintf
>  - Add comment about mkostemp
>  - Fix declaration of linestr var to use size of linenr
>  - Wrap in #ifdef __linux__
> 

ACK with one nit:

> +# ifdef __linux__

> +static void
> +virLogOutputToJournald(virLogSource source,

> +# endif /* __linux__ */
>  #endif /* HAVE_SYSLOG_H */
>  
>  #define IS_SPACE(cur)                                                   \
> @@ -1114,6 +1292,12 @@ virLogParseOutputs(const char *outputs)
>                  count++;
>              VIR_FREE(name);
>              VIR_FREE(abspath);
> +        } else if (STREQLEN(cur, "journald", 8)) {
> +            cur += 8;
> +#if HAVE_SYSLOG_H
> +            if (virLogAddOutputToJournald(prio) == 0)

This will fail to compile on non-Linux systems that have <syslog.h>.
Make the condition:

#if HAVE_SYSLOG_H && defined __linux__

-- 
Eric Blake   eblake at redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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