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-rw-r--r--src/core/loggingrb.c102
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diff --git a/src/core/loggingrb.c b/src/core/loggingrb.c
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+/*! \file loggingrb.c
+ * Ringbuffer-backed logging support code. */
+/*
+ * (C) 2012-2013 by Katerina Barone-Adesi
+ * All Rights Reserved
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+/*! \addtogroup loggingrb
+ * @{
+ * This adds a log which consist of an in-memory ring buffer. The idea
+ * is that the user can configure his logging in a way that critical
+ * messages get stored in the ring buffer, and that the last few
+ * critical messages can then always obtained by dumping the ring
+ * buffer. It can hence be used as a more generic version of the
+ * "show me the last N alarms" functionality.
+ *
+ * \file loggingrb.c */
+
+#include <osmocom/core/strrb.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/loggingrb.h>
+
+static void _rb_output(struct log_target *target,
+ unsigned int level, const char *log)
+{
+ osmo_strrb_add(target->tgt_rb.rb, log);
+}
+
+/*! Return the number of log strings in the osmo_strrb-backed target.
+ * \param[in] target The target to search.
+ *
+ * \return The number of log strings in the osmo_strrb-backed target.
+ */
+size_t log_target_rb_used_size(struct log_target const *target)
+{
+ return osmo_strrb_elements(target->tgt_rb.rb);
+}
+
+/*! Return the capacity of the osmo_strrb-backed target.
+ * \param[in] target The target to search.
+ *
+ * Note that this is the capacity (aka max number of messages).
+ * It is not the number of unused message slots.
+ * \return The number of log strings in the osmo_strrb-backed target.
+ */
+size_t log_target_rb_avail_size(struct log_target const *target)
+{
+ struct osmo_strrb *rb = target->tgt_rb.rb;
+ return rb->size - 1;
+}
+
+/*! Return the nth log entry in a target.
+ * \param[in] target The target to search.
+ * \param[in] logindex The index of the log entry/error message.
+ *
+ * \return A pointer to the nth message, or NULL if logindex is invalid.
+ */
+const char *log_target_rb_get(struct log_target const *target, size_t logindex)
+{
+ return osmo_strrb_get_nth(target->tgt_rb.rb, logindex);
+}
+
+/*! Create a new logging target for ringbuffer-backed logging.
+ * \param[in] size The capacity (number of messages) of the logging target.
+ * \returns A log target in case of success, NULL in case of error.
+ */
+struct log_target *log_target_create_rb(size_t size)
+{
+ struct log_target *target;
+ struct osmo_strrb *rb;
+
+ target = log_target_create();
+ if (!target)
+ return NULL;
+
+ rb = osmo_strrb_create(target, size + 1);
+ if (!rb) {
+ log_target_destroy(target);
+ return NULL;
+ }
+
+ target->tgt_rb.rb = rb;
+ target->type = LOG_TGT_TYPE_STRRB;
+ target->output = _rb_output;
+
+ return target;
+}
+
+/* @} */