[PATCH v32 08/12] log: add hook for printing log messages

[David Marchand <david.marchand@redhat.com>]

From: Stephen Hemminger <stephen@networkplumber.org>

This is useful for when decorating log output for console or journal.
Provide basic version in this patch.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Morten Brørup <mb@smartsharesystems.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Chengwen Feng <fengchengwen@huawei.com>
---
 lib/log/log.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/log/log.c b/lib/log/log.c
index a5cae1f950..dbff223108 100644
--- a/lib/log/log.c
+++ b/lib/log/log.c
@@ -29,16 +29,21 @@ struct rte_log_dynamic_type {
 	uint32_t loglevel;
 };
 
+/* Note: same as vfprintf() */
+typedef int (*log_print_t)(FILE *f, const char *fmt, va_list ap);
+
 /** The rte_log structure. */
 static struct rte_logs {
 	uint32_t type;  /**< Bitfield with enabled logs. */
 	uint32_t level; /**< Log level. */
 	FILE *file;     /**< Output file set by rte_openlog_stream, or NULL. */
+	log_print_t print_func;
 	size_t dynamic_types_len;
 	struct rte_log_dynamic_type *dynamic_types;
 } rte_logs = {
 	.type = UINT32_MAX,
 	.level = RTE_LOG_DEBUG,
+	.print_func = vfprintf,
 };
 
 struct rte_eal_opt_loglevel {
@@ -75,6 +80,7 @@ int
 rte_openlog_stream(FILE *f)
 {
 	rte_logs.file = f;
+	rte_logs.print_func = vfprintf;
 	return 0;
 }
 
@@ -471,7 +477,7 @@ rte_vlog(uint32_t level, uint32_t logtype, const char *format, va_list ap)
 	RTE_PER_LCORE(log_cur_msg).loglevel = level;
 	RTE_PER_LCORE(log_cur_msg).logtype = logtype;
 
-	ret = vfprintf(f, format, ap);
+	ret = (*rte_logs.print_func)(f, format, ap);
 	fflush(f);
 	return ret;
 }
-- 
2.47.0