[PATCH v3 2/4] eal: fix errno not set if strftime return zero

[Chengwen Feng <fengchengwen@huawei.com>]

The trace_session_name_generate() takes errno as the return value, but
the errno was not set if strftime return zero, the previously set errno
is returned in this case, this will result in inaccurate prompting.

This patch sets errno to ENOSPC if strftime return zero to fix it.

Fixes: 321dd5f8fa62 ("trace: add internal init and fini interface")
Cc: stable@dpdk.org

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
---
 lib/eal/common/eal_common_trace_utils.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/eal/common/eal_common_trace_utils.c b/lib/eal/common/eal_common_trace_utils.c
index 64f58fb66a..09f97d3c34 100644
--- a/lib/eal/common/eal_common_trace_utils.c
+++ b/lib/eal/common/eal_common_trace_utils.c
@@ -109,8 +109,10 @@ trace_session_name_generate(char *trace_dir)
 
 	rc = strftime(trace_dir + rc, TRACE_DIR_STR_LEN - rc,
 			"%Y-%m-%d-%p-%I-%M-%S", tm_result);
-	if (rc == 0)
+	if (rc == 0) {
+		errno = ENOSPC;
 		goto fail;
+	}
 
 	return rc;
 fail:
-- 
2.33.0