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

[Li Feng <fengli@smartx.com>]

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@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