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

[Li Feng]

Currently, the dpdk log is out to stdout/stderr and syslog.
We should support to output the log to another please, e.g. file or
glog.

Signed-off-by: Li Feng <fengli at smartx.com>
---
 lib/librte_eal/common/eal_private.h | 10 ----------
 lib/librte_eal/include/rte_eal.h    | 22 ++++++++++++++++++++++
 lib/librte_eal/linux/eal.c          |  2 +-
 lib/librte_eal/linux/eal_log.c      | 13 ++++++++-----
 lib/librte_eal/windows/eal.c        |  2 +-
 lib/librte_eal/windows/eal_log.c    |  2 +-
 6 files changed, 33 insertions(+), 18 deletions(-)

diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
index 4684c4c7d..8cfb399b8 100644
--- a/lib/librte_eal/common/eal_private.h
+++ b/lib/librte_eal/common/eal_private.h
@@ -143,16 +143,6 @@ int rte_eal_memory_init(void);
  */
 int rte_eal_timer_init(void);
 
-/**
- * Init the default log stream
- *
- * This function is private to EAL.
- *
- * @return
- *   0 on success, negative on error
- */
-int rte_eal_log_init(const char *id, int facility);
-
 /**
  * Save the log regexp for later
  */
diff --git a/lib/librte_eal/include/rte_eal.h b/lib/librte_eal/include/rte_eal.h
index eaf6469e5..f07d89f5f 100644
--- a/lib/librte_eal/include/rte_eal.h
+++ b/lib/librte_eal/include/rte_eal.h
@@ -114,6 +114,28 @@ int rte_eal_iopl_init(void);
  */
 int rte_eal_init(int argc, char **argv);
 
+/**
+ * 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;
+
+/**
+ * Init the default log stream
+ *
+ * @param id
+ *   The openlog's first argument.
+ * @param facility
+ *   The openlog's third argument.
+ * @param logf
+ *   The customized logger function, if it's set, the id and facility will
+ *   be ignored.
+ * @return
+ *   0 on success, negative on error
+ */
+int rte_eal_log_init(const char *id, int facility, rte_log_func_t *logf);
+
 /**
  * Clean up the Environment Abstraction Layer (EAL)
  *
diff --git a/lib/librte_eal/linux/eal.c b/lib/librte_eal/linux/eal.c
index 32b48c3de..62747b3a7 100644
--- a/lib/librte_eal/linux/eal.c
+++ b/lib/librte_eal/linux/eal.c
@@ -1160,7 +1160,7 @@ rte_eal_init(int argc, char **argv)
 #endif
 	}
 
-	if (rte_eal_log_init(logid, internal_conf->syslog_facility) < 0) {
+	if (rte_eal_log_init(logid, internal_conf->syslog_facility, NULL) < 0) {
 		rte_eal_init_alert("Cannot init logging.");
 		rte_errno = ENOMEM;
 		__atomic_store_n(&run_once, 0, __ATOMIC_RELAXED);
diff --git a/lib/librte_eal/linux/eal_log.c b/lib/librte_eal/linux/eal_log.c
index 43c8460bf..f985b3d36 100644
--- a/lib/librte_eal/linux/eal_log.c
+++ b/lib/librte_eal/linux/eal_log.c
@@ -37,18 +37,21 @@ console_log_write(__rte_unused void *c, const char *buf, size_t size)
 	return ret;
 }
 
-static cookie_io_functions_t console_log_func = {
-	.write = console_log_write,
-};
-
 /*
  * set the log to default function, called during eal init process,
  * once memzones are available.
  */
 int
-rte_eal_log_init(const char *id, int facility)
+rte_eal_log_init(const char *id, int facility, rte_log_func_t *logf)
 {
 	FILE *log_stream;
+	cookie_io_functions_t console_log_func;
+
+	if (logf) {
+		console_log_func.write = logf;
+	} else {
+		console_log_func.write = console_log_write;
+	}
 
 	log_stream = fopencookie(NULL, "w+", console_log_func);
 	if (log_stream == NULL)
diff --git a/lib/librte_eal/windows/eal.c b/lib/librte_eal/windows/eal.c
index 1e5f6576f..74fdd076a 100644
--- a/lib/librte_eal/windows/eal.c
+++ b/lib/librte_eal/windows/eal.c
@@ -266,7 +266,7 @@ rte_eal_init(int argc, char **argv)
 		eal_get_internal_configuration();
 	int ret;
 
-	rte_eal_log_init(NULL, 0);
+	rte_eal_log_init(NULL, 0, NULL);
 
 	eal_log_level_parse(argc, argv);
 
diff --git a/lib/librte_eal/windows/eal_log.c b/lib/librte_eal/windows/eal_log.c
index 875981f13..31f556908 100644
--- a/lib/librte_eal/windows/eal_log.c
+++ b/lib/librte_eal/windows/eal_log.c
@@ -6,7 +6,7 @@
 
 /* set the log to default function, called during eal init process. */
 int
-rte_eal_log_init(__rte_unused const char *id, __rte_unused int facility)
+rte_eal_log_init(__rte_unused const char *id, __rte_unused int facility, rte_log_func_t *logf)
 {
 	rte_openlog_stream(stderr);
 
-- 
2.29.2