Provide a way to send binary data over unix sockets

src/libckpool.c

@@ -722,6 +722,45 @@ int write_length(int sockd, const void *buf, int len)
 	return ofs;
 }
 
+bool _send_unix_data(int sockd, void *buf, uint32_t len, const char *file, const char *func, const int line)
+{
+	bool retval = false;
+	uint32_t msglen;
+	int ret;
+
+	if (unlikely(!buf)) {
+		LOGWARNING("Null message sent to send_unix_msg");
+		goto out;
+	}
+	msglen = htole32(len);
+	ret = wait_write_select(sockd, 5);
+	if (unlikely(ret < 1)) {
+		LOGERR("Select1 failed in send_unix_msg");
+		goto out;
+	}
+	ret = write_length(sockd, &msglen, 4);
+	if (unlikely(ret < 4)) {
+		LOGERR("Failed to write 4 byte length in send_unix_msg");
+		goto out;
+	}
+	ret = wait_write_select(sockd, 5);
+	if (unlikely(ret < 1)) {
+		LOGERR("Select2 failed in send_unix_msg");
+		goto out;
+	}
+	ret = write_length(sockd, buf, len);
+	if (unlikely(ret < 0)) {
+		LOGERR("Failed to write %d bytes in send_unix_msg", len);
+		goto out;
+	}
+	retval = true;
+out:
+	if (unlikely(!retval))
+		LOGERR("Failure in send_unix_msg from %s %s:%d", file, func, line);
+	return retval;
+}
+
+
 bool _send_unix_msg(int sockd, const char *buf, const char *file, const char *func, const int line)
 {
 	uint32_t msglen, len;

src/libckpool.h

@@ -344,6 +344,8 @@ int wait_write_select(int sockd, int timeout);
 int write_length(int sockd, const void *buf, int len);
 bool _send_unix_msg(int sockd, const char *buf, const char *file, const char *func, const int line);
 #define send_unix_msg(sockd, buf) _send_unix_msg(sockd, buf, __FILE__, __func__, __LINE__)
+bool _send_unix_data(int sockd, void *buf, uint32_t len, const char *file, const char *func, const int line);
+#define send_unix_data(sockd, buf, len) _send_unix_data(sockd, buf, len, __FILE__, __func__, __LINE__)
 
 const char *__json_array_string(json_t *val, unsigned int entry);
 char *json_array_string(json_t *val, unsigned int entry);