From f00856cd38e16d3700ea3a180d4687413a300742 Mon Sep 17 00:00:00 2001
From: Anthony Towns <aj@erisian.com.au>
Date: Thu, 11 Jun 2026 11:15:08 +1000
Subject: [PATCH 1/2] Append to logshares rather than overwriting

---
 src/stratifier.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/stratifier.c b/src/stratifier.c
index cd03e120..4a23934a 100644
--- a/src/stratifier.c
+++ b/src/stratifier.c
@@ -6366,10 +6366,9 @@ static bool parse_submit(stratum_instance_t *client, yyjson_mut_val *params_val,
 	if (ckp->logshares) {
 		fp = fopen(fname, "ae");
 		if (likely(fp)) {
-			yyjson_mut_write_file(fname, doc, YYJSON_WRITE_NEWLINE_AT_END, NULL, NULL);
+			if (!yyjson_mut_write_fp(fp, doc, YYJSON_WRITE_NEWLINE_AT_END, NULL, NULL))
+				LOGERR("Failed to write to %s", fname);
 			fclose(fp);
-			if (unlikely(len < 0))
-				LOGERR("Failed to fwrite to %s", fname);
 		} else
 			LOGERR("Failed to fopen %s", fname);
 	}

From 3e706e71a42e6c0b9258f916dcf1bdebf3c32605 Mon Sep 17 00:00:00 2001
From: Anthony Towns <aj@erisian.com.au>
Date: Thu, 11 Jun 2026 11:16:51 +1000
Subject: [PATCH 2/2] Log workbase information with -L

---
 README           |  4 ++--
 src/stratifier.c | 12 ++++++++++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/README b/README
index cb5ba00c..19c51702 100644
--- a/README
+++ b/README
@@ -218,8 +218,8 @@ down.
 killing it if need be. Otherwise ckpool will refuse to start if an instance of
 the same name is already running.
 
--L will log per share information in the logs directory divided by block height
-and then workbase.
+-L will log per share information and workbase information in the logs directory
+divided by block height and then workbase.
 
 -l <LOGLEVEL will change the log level to that specified. Default is 5 and
 maximum debug is level 7.
diff --git a/src/stratifier.c b/src/stratifier.c
index 4a23934a..b5e305b3 100644
--- a/src/stratifier.c
+++ b/src/stratifier.c
@@ -1116,6 +1116,18 @@ static void add_base(ckpool_t *ckp, sdata_t *sdata, workbase_t *wb, bool *new_bl
 		tv_time(&sdata->current_workbase->retired);
 	sdata->current_workbase = wb;
 
+	if (ckp->logshares) {
+		char *wifname;
+		json_t *wival;
+
+		ASPRINTF(&wifname, "%s.workinfo", wb->logdir);
+		wival = generate_workinfo(ckp, wb, __func__);
+		if (json_dump_file(wival, wifname, JSON_NO_UTF8 | JSON_PRESERVE_ORDER | JSON_COMPACT | JSON_EOL) == -1)
+			LOGERR("Failed to write to %s", wifname);
+		json_decref(wival);
+		dealloc(wifname);
+	}
+
 	/* Is this long enough to ensure we don't dereference a workbase
 	 * immediately? Should be unless clock changes 10 minutes so we use
 	 * ts_realtime */