[PATCH v5 5/6] eal: allow user to set default log stream before init

[Stephen Hemminger]

It is useful for application to be able to set the default log
stream before call rte_eal_init(). This makes all messages go
to the new default.

For example, to skip using syslog; just doing
        rte_log_set_default(stderr);

Signed-off-by: Stephen Hemminger <step...@networkplumber.org>
---
 lib/eal/common/eal_common_log.c | 6 ++++++
 lib/eal/common/eal_log.h        | 1 +
 lib/eal/unix/eal_log.c          | 4 ++++
 3 files changed, 11 insertions(+)

diff --git a/lib/eal/common/eal_common_log.c b/lib/eal/common/eal_common_log.c
index bd7b188ceb4a..9b158c201205 100644
--- a/lib/eal/common/eal_common_log.c
+++ b/lib/eal/common/eal_common_log.c
@@ -535,6 +535,12 @@ eal_log_set_default(FILE *default_log)
 #endif
 }
 
+FILE *
+eal_log_get_default(void)
+{
+       return default_log_stream;
+}
+
 /*
  * Called by eal_cleanup
  */
diff --git a/lib/eal/common/eal_log.h b/lib/eal/common/eal_log.h
index 31dc489350f6..268c2a264382 100644
--- a/lib/eal/common/eal_log.h
+++ b/lib/eal/common/eal_log.h
@@ -22,6 +22,7 @@ int eal_log_level_parse(int argc, char * const argv[]);
  * Determine where log data is written when no call to rte_openlog_stream.
  */
 void eal_log_set_default(FILE *default_log);
+FILE *eal_log_get_default(void);
 
 /*
  * Save a log option for later.
diff --git a/lib/eal/unix/eal_log.c b/lib/eal/unix/eal_log.c
index 7921417b050a..3bfe5853095f 100644
--- a/lib/eal/unix/eal_log.c
+++ b/lib/eal/unix/eal_log.c
@@ -113,6 +113,10 @@ eal_log_init(const char *id, int facility)
 {
        FILE *log_stream;
 
+       /* has user has already setup a log stream */
+       if (eal_log_get_default())
+               return 0;
+
        log_stream = fopencookie(NULL, "w+", console_log_func);
        if (log_stream == NULL)
                return -1;
-- 
2.39.2