[dpdk-dev] [PATCH v2] log: support custom log function

[Feng Li]

Li Feng <fengli at smartx.com> 于2021年2月6日周六 上午1:42写道：
>
> Currently, the dpdk log is out to stdout/stderr and syslog.
> The rte_openlog_stream could set an external FILE* stream, but it asks the
> consumer to give it a FILE* pointer.
> For C++ or other languages, it's hard to get a libc FILE*.
>
> Support to set a hook method is another choice for this scenario.
>
> Change-Id: I3b2419cc2fe5256205daa8077fd8862a8e58fb6c
> Signed-off-by: Li Feng <fengli at smartx.com>
> ---
> v2: simplify the code.
>
>  lib/librte_eal/include/rte_eal.h | 16 ++++++++++++++++
>  lib/librte_eal/linux/eal_log.c   | 10 ++++++++++
>  2 files changed, 26 insertions(+)
>
> diff --git a/lib/librte_eal/include/rte_eal.h b/lib/librte_eal/include/rte_eal.h
> index eaf6469e5..bd6cf554b 100644
> --- a/lib/librte_eal/include/rte_eal.h
> +++ b/lib/librte_eal/include/rte_eal.h
> @@ -501,6 +501,22 @@ rte_eal_mbuf_user_pool_ops(void);
>  const char *
>  rte_eal_get_runtime_dir(void);
>
> +/**
> + * Usage function typedef used by the application usage function.
> + *
> + * Use this function typedef to define a logger formatter.
> + */
> +typedef cookie_write_function_t rte_log_func_t;
> +
> +/**
> + * Set a customized logger.
> + *
> + * @param logf
> + *   The customized logger function.
> + */
> +void
> +rte_eal_set_log_func(rte_log_func_t *logf);
> +
>  #ifdef __cplusplus
>  }
>  #endif
> diff --git a/lib/librte_eal/linux/eal_log.c b/lib/librte_eal/linux/eal_log.c
> index 43c8460bf..c0a7a12ab 100644
> --- a/lib/librte_eal/linux/eal_log.c
> +++ b/lib/librte_eal/linux/eal_log.c
> @@ -60,3 +60,13 @@ rte_eal_log_init(const char *id, int facility)
>
>         return 0;
>  }
> +
> +/*
> + * Set the customized logger, it will override the default action, which is
> + * writing to syslog and stdout.
> + */
> +void
> +rte_eal_set_log_func(rte_log_func_t *logf)
> +{
> +    console_log_func.write = logf;
> +}
> --
> 2.29.2
>
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