Fix: handle packet_seek errors

[babeltrace.git] / formats / ctf / ir / stream.c

/*
 * stream.c
 *
 * Babeltrace CTF IR - Stream
 *
 * Copyright 2013, 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <babeltrace/ctf-ir/clock.h>
#include <babeltrace/ctf-ir/clock-internal.h>
#include <babeltrace/ctf-writer/event.h>
#include <babeltrace/ctf-ir/event-internal.h>
#include <babeltrace/ctf-ir/field-types-internal.h>
#include <babeltrace/ctf-ir/fields-internal.h>
#include <babeltrace/ctf-ir/stream-internal.h>
#include <babeltrace/ctf-ir/stream-class-internal.h>
#include <babeltrace/ctf-ir/trace-internal.h>
#include <babeltrace/ctf-writer/writer-internal.h>
#include <babeltrace/ref.h>
#include <babeltrace/ctf-writer/functor-internal.h>
#include <babeltrace/compiler.h>
#include <babeltrace/align.h>
#include <babeltrace/ctf/ctf-index.h>

static
void bt_ctf_stream_destroy(struct bt_object *obj);
static
int set_structure_field_integer(struct bt_ctf_field *, char *, uint64_t);

static
int set_packet_header_magic(struct bt_ctf_stream *stream)
{
        int ret = 0;
        struct bt_ctf_field_type *magic_field_type = NULL;
        struct bt_ctf_field *magic_field = bt_ctf_field_structure_get_field(
                stream->packet_header, "magic");

        if (!magic_field) {
                /* No magic field found. Not an error, skip. */
                goto end;
        }

        if (!bt_ctf_field_validate(magic_field)) {
                /* Value already set. Not an error, skip. */
                goto end;
        }

        magic_field_type = bt_ctf_field_get_type(magic_field);
        assert(magic_field_type);

        if (bt_ctf_field_type_get_type_id(magic_field_type) !=
                CTF_TYPE_INTEGER) {
                /* Magic field is not an integer. Not an error, skip. */
                goto end;
        }

        if (bt_ctf_field_type_integer_get_size(magic_field_type) != 32) {
                /*
                 * Magic field is not of the expected size.
                 * Not an error, skip.
                 */
                goto end;
        }

        ret = bt_ctf_field_type_integer_get_signed(magic_field_type);
        assert(ret >= 0);
        if (ret) {
                ret = bt_ctf_field_signed_integer_set_value(magic_field,
                        (int64_t) 0xC1FC1FC1);
        } else {
                ret = bt_ctf_field_unsigned_integer_set_value(magic_field,
                        (uint64_t) 0xC1FC1FC1);
        }
end:
        bt_put(magic_field);
        bt_put(magic_field_type);
        return ret;
}

static
int set_packet_header_uuid(struct bt_ctf_stream *stream)
{
        int i, ret = 0;
        struct bt_ctf_trace *trace = NULL;
        struct bt_ctf_field_type *uuid_field_type = NULL;
        struct bt_ctf_field_type *element_field_type = NULL;
        struct bt_ctf_field *uuid_field = bt_ctf_field_structure_get_field(
                stream->packet_header, "uuid");

        if (!uuid_field) {
                /* No uuid field found. Not an error, skip. */
                goto end;
        }

        if (!bt_ctf_field_validate(uuid_field)) {
                /* Value already set. Not an error, skip. */
                goto end;
        }

        uuid_field_type = bt_ctf_field_get_type(uuid_field);
        assert(uuid_field_type);
        if (bt_ctf_field_type_get_type_id(uuid_field_type) !=
                CTF_TYPE_ARRAY) {
                /* UUID field is not an array. Not an error, skip. */
                goto end;
        }

        if (bt_ctf_field_type_array_get_length(uuid_field_type) != 16) {
                /*
                 * UUID field is not of the expected size.
                 * Not an error, skip.
                 */
                goto end;
        }

        element_field_type = bt_ctf_field_type_array_get_element_type(
                uuid_field_type);
        assert(element_field_type);
        if (bt_ctf_field_type_get_type_id(element_field_type) !=
                CTF_TYPE_INTEGER) {
                /* UUID array elements are not integers. Not an error, skip */
                goto end;
        }

        trace = (struct bt_ctf_trace *) bt_object_get_parent(stream);
        for (i = 0; i < 16; i++) {
                struct bt_ctf_field *uuid_element =
                        bt_ctf_field_array_get_field(uuid_field, i);

                ret = bt_ctf_field_type_integer_get_signed(element_field_type);
                assert(ret >= 0);

                if (ret) {
                        ret = bt_ctf_field_signed_integer_set_value(
                                uuid_element, (int64_t) trace->uuid[i]);
                } else {
                        ret = bt_ctf_field_unsigned_integer_set_value(
                                uuid_element,
                                (uint64_t) trace->uuid[i]);
                }
                bt_put(uuid_element);
                if (ret) {
                        goto end;
                }
        }

end:
        bt_put(uuid_field);
        bt_put(uuid_field_type);
        bt_put(element_field_type);
        BT_PUT(trace);
        return ret;
}
static
int set_packet_header_stream_id(struct bt_ctf_stream *stream)
{
        int ret = 0;
        uint32_t stream_id;
        struct bt_ctf_field_type *stream_id_field_type = NULL;
        struct bt_ctf_field *stream_id_field = bt_ctf_field_structure_get_field(
                stream->packet_header, "stream_id");

        if (!stream_id_field) {
                /* No stream_id field found. Not an error, skip. */
                goto end;
        }

        if (!bt_ctf_field_validate(stream_id_field)) {
                /* Value already set. Not an error, skip. */
                goto end;
        }

        stream_id_field_type = bt_ctf_field_get_type(stream_id_field);
        assert(stream_id_field_type);
        if (bt_ctf_field_type_get_type_id(stream_id_field_type) !=
                CTF_TYPE_INTEGER) {
                /* stream_id field is not an integer. Not an error, skip. */
                goto end;
        }

        stream_id = stream->stream_class->id;
        ret = bt_ctf_field_type_integer_get_signed(stream_id_field_type);
        assert(ret >= 0);
        if (ret) {
                ret = bt_ctf_field_signed_integer_set_value(stream_id_field,
                        (int64_t) stream_id);
        } else {
                ret = bt_ctf_field_unsigned_integer_set_value(stream_id_field,
                        (uint64_t) stream_id);
        }
end:
        bt_put(stream_id_field);
        bt_put(stream_id_field_type);
        return ret;
}

static
int set_packet_header(struct bt_ctf_stream *stream)
{
        int ret;

        ret = set_packet_header_magic(stream);
        if (ret) {
                goto end;
        }

        ret = set_packet_header_uuid(stream);
        if (ret) {
                goto end;
        }

        ret = set_packet_header_stream_id(stream);
        if (ret) {
                goto end;
        }
end:
        return ret;
}

static
void release_event(struct bt_ctf_event *event)
{
        if (bt_object_get_ref_count(event)) {
                /*
                 * The event is being orphaned, but it must guarantee the
                 * existence of its event class for the duration of its
                 * lifetime.
                 */
                bt_get(event->event_class);
                BT_PUT(event->base.parent);
        } else {
                bt_object_release(event);
        }
}

static
int create_stream_file(struct bt_ctf_writer *writer,
                struct bt_ctf_stream *stream)
{
        int fd;
        GString *filename = g_string_new(stream->stream_class->name->str);

        if (stream->stream_class->name->len == 0) {
                int64_t ret;

                ret = bt_ctf_stream_class_get_id(stream->stream_class);
                if (ret < 0) {
                        fd = -1;
                        goto error;
                }

                g_string_printf(filename, "stream_%" PRId64, ret);
        }

        g_string_append_printf(filename, "_%" PRIu32, stream->id);
        fd = openat(writer->trace_dir_fd, filename->str,
                O_RDWR | O_CREAT | O_TRUNC,
                S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
error:
        g_string_free(filename, TRUE);
        return fd;
}

static
int set_stream_fd(struct bt_ctf_stream *stream, int fd)
{
        int ret = 0;

        if (stream->pos.fd != -1) {
                ret = -1;
                goto end;
        }

        ctf_init_pos(&stream->pos, NULL, fd, O_RDWR);
        stream->pos.fd = fd;
end:
        return ret;
}

struct bt_ctf_stream *bt_ctf_stream_create(
                struct bt_ctf_stream_class *stream_class,
                const char *name)
{
        int ret;
        struct bt_ctf_stream *stream = NULL;
        struct bt_ctf_trace *trace = NULL;
        struct bt_ctf_writer *writer = NULL;

        if (!stream_class) {
                goto error;
        }

        trace = bt_ctf_stream_class_get_trace(stream_class);
        if (!trace) {
                goto error;
        }

        stream = g_new0(struct bt_ctf_stream, 1);
        if (!stream) {
                goto error;
        }

        bt_object_init(stream, bt_ctf_stream_destroy);
        /*
         * Acquire reference to parent since stream will become publicly
         * reachable; it needs its parent to remain valid.
         */
        bt_object_set_parent(stream, trace);
        stream->id = stream_class->next_stream_id++;
        stream->stream_class = stream_class;
        stream->pos.fd = -1;

        if (name) {
                stream->name = g_string_new(name);
                if (!stream->name) {
                        goto error;
                }
        }

        if (trace->is_created_by_writer) {
                int fd;
                writer = (struct bt_ctf_writer *)
                        bt_object_get_parent(trace);

                assert(writer);
                stream->packet_context = bt_ctf_field_create(
                        stream_class->packet_context_type);
                if (!stream->packet_context) {
                        goto error;
                }

                /* Initialize events_discarded */
                ret = set_structure_field_integer(stream->packet_context,
                        "events_discarded", 0);
                if (ret) {
                        goto error;
                }

                stream->events = g_ptr_array_new_with_free_func(
                        (GDestroyNotify) release_event);
                if (!stream->events) {
                        goto error;
                }

                /* A trace is not allowed to have a NULL packet header */
                assert(trace->packet_header_type);
                stream->packet_header =
                        bt_ctf_field_create(trace->packet_header_type);
                if (!stream->packet_header) {
                        goto error;
                }

                /*
                 * Attempt to populate the default trace packet header fields
                 * (magic, uuid and stream_id). This will _not_ fail shall the
                 * fields not be found or be of an incompatible type; they will
                 * simply not be populated automatically. The user will have to
                 * make sure to set the trace packet header fields himself
                 * before flushing.
                 */
                ret = set_packet_header(stream);
                if (ret) {
                        goto error;
                }

                /* Create file associated with this stream */
                fd = create_stream_file(writer, stream);
                if (fd < 0) {
                        goto error;
                }

                ret = set_stream_fd(stream, fd);
                if (ret) {
                        goto error;
                }

                /* Freeze the writer */
                bt_ctf_writer_freeze(writer);
        } else {
                /* Non-writer stream indicated by a negative FD */
                ret = set_stream_fd(stream, -1);
                if (ret) {
                        goto error;
                }

                stream->clock_values = g_hash_table_new_full(g_direct_hash,
                        g_direct_equal, NULL, g_free);
        }

        /* Add this stream to the trace's streams */
        g_ptr_array_add(trace->streams, stream);

        BT_PUT(trace);
        BT_PUT(writer);
        return stream;
error:
        BT_PUT(stream);
        BT_PUT(trace);
        BT_PUT(writer);
        return stream;
}

struct bt_ctf_stream_class *bt_ctf_stream_get_class(
                struct bt_ctf_stream *stream)
{
        struct bt_ctf_stream_class *stream_class = NULL;

        if (!stream) {
                goto end;
        }

        stream_class = stream->stream_class;
        bt_get(stream_class);
end:
        return stream_class;
}

int bt_ctf_stream_get_discarded_events_count(
                struct bt_ctf_stream *stream, uint64_t *count)
{
        int64_t ret = 0;
        int field_signed;
        struct bt_ctf_field *events_discarded_field = NULL;
        struct bt_ctf_field_type *events_discarded_field_type = NULL;

        if (!stream || !count || !stream->packet_context ||
                        stream->pos.fd < 0) {
                ret = -1;
                goto end;
        }

        events_discarded_field = bt_ctf_field_structure_get_field(
                stream->packet_context, "events_discarded");
        if (!events_discarded_field) {
                ret = -1;
                goto end;
        }

        events_discarded_field_type = bt_ctf_field_get_type(
                events_discarded_field);
        if (!events_discarded_field_type) {
                ret = -1;
                goto end;
        }

        field_signed = bt_ctf_field_type_integer_get_signed(
                events_discarded_field_type);
        if (field_signed < 0) {
                ret = field_signed;
                goto end;
        }

        if (field_signed) {
                int64_t signed_count;

                ret = bt_ctf_field_signed_integer_get_value(
                        events_discarded_field, &signed_count);
                if (ret) {
                        goto end;
                }
                if (signed_count < 0) {
                        /* Invalid value */
                        ret = -1;
                        goto end;
                }
                *count = (uint64_t) signed_count;
        } else {
                ret = bt_ctf_field_unsigned_integer_get_value(
                        events_discarded_field, count);
                if (ret) {
                        goto end;
                }
        }
end:
        bt_put(events_discarded_field);
        bt_put(events_discarded_field_type);
        return ret;
}

void bt_ctf_stream_append_discarded_events(struct bt_ctf_stream *stream,
                uint64_t event_count)
{
        int ret;
        int field_signed;
        uint64_t previous_count;
        uint64_t new_count;
        struct bt_ctf_field *events_discarded_field = NULL;
        struct bt_ctf_field_type *events_discarded_field_type = NULL;

        if (!stream || !stream->packet_context || stream->pos.fd < 0) {
                goto end;
        }

        ret = bt_ctf_stream_get_discarded_events_count(stream,
                &previous_count);
        if (ret) {
                goto end;
        }

        events_discarded_field = bt_ctf_field_structure_get_field(
                stream->packet_context, "events_discarded");
        if (!events_discarded_field) {
                goto end;
        }

        events_discarded_field_type = bt_ctf_field_get_type(
                events_discarded_field);
        if (!events_discarded_field_type) {
                goto end;
        }

        field_signed = bt_ctf_field_type_integer_get_signed(
                events_discarded_field_type);
        if (field_signed < 0) {
                goto end;
        }

        new_count = previous_count + event_count;
        if (field_signed) {
                ret = bt_ctf_field_signed_integer_set_value(
                        events_discarded_field, (int64_t) new_count);
                if (ret) {
                        goto end;
                }
        } else {
                ret = bt_ctf_field_unsigned_integer_set_value(
                        events_discarded_field, new_count);
                if (ret) {
                        goto end;
                }
        }

end:
        bt_put(events_discarded_field);
        bt_put(events_discarded_field_type);
}

int bt_ctf_stream_append_event(struct bt_ctf_stream *stream,
                struct bt_ctf_event *event)
{
        int ret = 0;

        if (!stream || !event || stream->pos.fd < 0) {
                ret = -1;
                goto end;
        }

        /*
         * The event is not supposed to have a parent stream at this
         * point. The only other way an event can have a parent stream
         * is if it was assigned when setting a packet to the event,
         * in which case the packet's stream is not a writer stream,
         * and thus the user is trying to append an event which belongs
         * to another stream.
         */
        if (event->base.parent) {
                ret = -1;
                goto end;
        }

        bt_object_set_parent(event, stream);
        ret = bt_ctf_event_populate_event_header(event);
        if (ret) {
                goto error;
        }

        /* Make sure the various scopes of the event are set */
        ret = bt_ctf_event_validate(event);
        if (ret) {
                goto error;
        }

        /* Save the new event and freeze it */
        bt_ctf_event_freeze(event);
        g_ptr_array_add(stream->events, event);

        /*
         * Event had to hold a reference to its event class as long as it wasn't
         * part of the same trace hierarchy. From now on, the event and its
         * class share the same lifetime guarantees and the reference is no
         * longer needed.
         */
        bt_put(event->event_class);

end:
        return ret;

error:
        /*
         * Orphan the event; we were not successful in associating it to
         * a stream.
         */
        bt_object_set_parent(event, NULL);

        return ret;
}

struct bt_ctf_field *bt_ctf_stream_get_packet_context(
                struct bt_ctf_stream *stream)
{
        struct bt_ctf_field *packet_context = NULL;

        if (!stream || stream->pos.fd < 0) {
                goto end;
        }

        packet_context = stream->packet_context;
        if (packet_context) {
                bt_get(packet_context);
        }
end:
        return packet_context;
}

BT_HIDDEN
int bt_ctf_stream_set_packet_context(struct bt_ctf_stream *stream,
                struct bt_ctf_field *field)
{
        int ret = 0;
        struct bt_ctf_field_type *field_type;

        if (!stream || !field || stream->pos.fd < 0) {
                ret = -1;
                goto end;
        }

        field_type = bt_ctf_field_get_type(field);
        if (bt_ctf_field_type_compare(field_type,
                        stream->stream_class->packet_context_type)) {
                ret = -1;
                goto end;
        }

        bt_put(field_type);
        bt_get(field);
        bt_put(stream->packet_context);
        stream->packet_context = field;
end:
        return ret;
}

BT_HIDDEN
struct bt_ctf_field *bt_ctf_stream_get_packet_header(
                struct bt_ctf_stream *stream)
{
        struct bt_ctf_field *packet_header = NULL;

        if (!stream || stream->pos.fd < 0) {
                goto end;
        }

        packet_header = stream->packet_header;
        if (packet_header) {
                bt_get(packet_header);
        }
end:
        return packet_header;
}

BT_HIDDEN
int bt_ctf_stream_set_packet_header(struct bt_ctf_stream *stream,
                struct bt_ctf_field *field)
{
        int ret = 0;
        struct bt_ctf_trace *trace = NULL;
        struct bt_ctf_field_type *field_type = NULL;

        if (!stream || !field || stream->pos.fd < 0) {
                ret = -1;
                goto end;
        }

        trace = (struct bt_ctf_trace *) bt_object_get_parent(stream);
        field_type = bt_ctf_field_get_type(field);
        if (bt_ctf_field_type_compare(field_type, trace->packet_header_type)) {
                ret = -1;
                goto end;
        }

        bt_get(field);
        bt_put(stream->packet_header);
        stream->packet_header = field;
end:
        BT_PUT(trace);
        bt_put(field_type);
        return ret;
}

static
int get_event_header_timestamp(struct bt_ctf_field *event_header, uint64_t *timestamp)
{
        int ret = 0;
        struct bt_ctf_field *timestamp_field = NULL;
        struct bt_ctf_field_type *timestamp_field_type = NULL;

        timestamp_field = bt_ctf_field_structure_get_field(event_header,
                "timestamp");
        if (!timestamp_field) {
                ret = -1;
                goto end;
        }

        timestamp_field_type = bt_ctf_field_get_type(timestamp_field);
        assert(timestamp_field_type);
        if (bt_ctf_field_type_get_type_id(timestamp_field_type) !=
                CTF_TYPE_INTEGER) {
                ret = -1;
                goto end;
        }

        if (bt_ctf_field_type_integer_get_signed(timestamp_field_type)) {
                int64_t val;

                ret = bt_ctf_field_signed_integer_get_value(timestamp_field,
                        &val);
                if (ret) {
                        goto end;
                }
                *timestamp = (uint64_t) val;
        } else {
                ret = bt_ctf_field_unsigned_integer_get_value(timestamp_field,
                        timestamp);
                if (ret) {
                        goto end;
                }
        }
end:
        bt_put(timestamp_field);
        bt_put(timestamp_field_type);
        return ret;
}

int bt_ctf_stream_flush(struct bt_ctf_stream *stream)
{
        int ret = 0;
        size_t i;
        uint64_t timestamp_begin, timestamp_end, events_discarded;
        struct bt_ctf_field *integer = NULL;
        struct ctf_stream_pos packet_context_pos;

        if (!stream || stream->pos.fd < 0) {
                /*
                 * Stream does not have an associated fd. It is,
                 * therefore, not a stream being used to write events.
                 */
                ret = -1;
                goto end;
        }

        if (!stream->events->len) {
                goto end;
        }

        ret = bt_ctf_field_validate(stream->packet_header);
        if (ret) {
                goto end;
        }

        /* mmap the next packet */
        ctf_packet_seek(&stream->pos.parent, 0, SEEK_CUR);
        ret = bt_packet_seek_get_error();
        if (ret) {
                goto end;
        }

        ret = bt_ctf_field_serialize(stream->packet_header, &stream->pos);
        if (ret) {
                goto end;
        }

        /* Set the default context attributes if present and unset. */
        if (!get_event_header_timestamp(
                ((struct bt_ctf_event *) g_ptr_array_index(
                stream->events, 0))->event_header, &timestamp_begin)) {
                ret = set_structure_field_integer(stream->packet_context,
                        "timestamp_begin", timestamp_begin);
                if (ret) {
                        goto end;
                }
        }

        if (!get_event_header_timestamp(
                ((struct bt_ctf_event *) g_ptr_array_index(
                stream->events, stream->events->len - 1))->event_header,
                &timestamp_end)) {

                ret = set_structure_field_integer(stream->packet_context,
                        "timestamp_end", timestamp_end);
                if (ret) {
                        goto end;
                }
        }
        ret = set_structure_field_integer(stream->packet_context,
                "content_size", UINT64_MAX);
        if (ret) {
                goto end;
        }

        ret = set_structure_field_integer(stream->packet_context,
                "packet_size", UINT64_MAX);
        if (ret) {
                goto end;
        }

        /* Write packet context */
        memcpy(&packet_context_pos, &stream->pos,
               sizeof(struct ctf_stream_pos));
        ret = bt_ctf_field_serialize(stream->packet_context,
                &stream->pos);
        if (ret) {
                goto end;
        }

        ret = bt_ctf_stream_get_discarded_events_count(stream,
                &events_discarded);
        if (ret) {
                goto end;
        }

        /* Unset the packet context's fields. */
        ret = bt_ctf_field_reset(stream->packet_context);
        if (ret) {
                goto end;
        }

        /* Set the previous number of discarded events. */
        ret = set_structure_field_integer(stream->packet_context,
                "events_discarded", events_discarded);
        if (ret) {
                goto end;
        }

        for (i = 0; i < stream->events->len; i++) {
                struct bt_ctf_event *event = g_ptr_array_index(
                        stream->events, i);

                ret = bt_ctf_field_reset(event->event_header);
                if (ret) {
                        goto end;
                }

                /* Write event header */
                ret = bt_ctf_field_serialize(event->event_header,
                        &stream->pos);
                if (ret) {
                        goto end;
                }

                /* Write stream event context */
                if (event->stream_event_context) {
                        ret = bt_ctf_field_serialize(
                                event->stream_event_context, &stream->pos);
                        if (ret) {
                                goto end;
                        }
                }

                /* Write event content */
                ret = bt_ctf_event_serialize(event, &stream->pos);
                if (ret) {
                        goto end;
                }
        }

        /*
         * Update the packet total size and content size and overwrite the
         * packet context.
         * Copy base_mma as the packet may have been remapped (e.g. when a
         * packet is resized).
         */
        packet_context_pos.base_mma = stream->pos.base_mma;
        ret = set_structure_field_integer(stream->packet_context,
                "content_size", stream->pos.offset);
        if (ret) {
                goto end;
        }

        ret = set_structure_field_integer(stream->packet_context,
                "packet_size", stream->pos.packet_size);
        if (ret) {
                goto end;
        }

        ret = bt_ctf_field_serialize(stream->packet_context,
                &packet_context_pos);
        if (ret) {
                goto end;
        }

        g_ptr_array_set_size(stream->events, 0);
        stream->flushed_packet_count++;
end:
        bt_put(integer);
        return ret;
}

void bt_ctf_stream_get(struct bt_ctf_stream *stream)
{
        bt_get(stream);
}

void bt_ctf_stream_put(struct bt_ctf_stream *stream)
{
        bt_put(stream);
}

static
void bt_ctf_stream_destroy(struct bt_object *obj)
{
        struct bt_ctf_stream *stream;

        stream = container_of(obj, struct bt_ctf_stream, base);
        ctf_fini_pos(&stream->pos);
        if (stream->pos.fd >= 0 && close(stream->pos.fd)) {
                perror("close");
        }

        if (stream->events) {
                g_ptr_array_free(stream->events, TRUE);
        }

        if (stream->name) {
                g_string_free(stream->name, TRUE);
        }

        if (stream->clock_values) {
                g_hash_table_destroy(stream->clock_values);
        }

        bt_put(stream->packet_header);
        bt_put(stream->packet_context);
        g_free(stream);
}

static
int set_structure_field_integer(struct bt_ctf_field *structure, char *name,
                uint64_t value)
{
        int ret = 0;
        struct bt_ctf_field_type *field_type = NULL;
        struct bt_ctf_field *integer =
                bt_ctf_field_structure_get_field(structure, name);

        if (!structure || !name) {
                ret = -1;
                goto end;
        }

        if (!integer) {
                /* Field not found, not an error. */
                goto end;
        }

        /* Make sure the payload has not already been set. */
        if (!bt_ctf_field_validate(integer)) {
                /* Payload already set, not an error */
                goto end;
        }

        field_type = bt_ctf_field_get_type(integer);
        /* Something is serioulsly wrong */
        assert(field_type);
        if (bt_ctf_field_type_get_type_id(field_type) != CTF_TYPE_INTEGER) {
                /*
                 * The user most likely meant for us to populate this field
                 * automatically. However, we can only do this if the field
                 * is an integer. Return an error.
                 */
                ret = -1;
                goto end;
        }

        if (bt_ctf_field_type_integer_get_signed(field_type)) {
                ret = bt_ctf_field_signed_integer_set_value(integer,
                        (int64_t) value);
        } else {
                ret = bt_ctf_field_unsigned_integer_set_value(integer, value);
        }
end:
        bt_put(integer);
        bt_put(field_type);
        return ret;
}

BT_HIDDEN
const char *bt_ctf_stream_get_name(struct bt_ctf_stream *stream)
{
        const char *name = NULL;

        if (!stream) {
                goto end;
        }

        name = stream->name ? stream->name->str : NULL;

end:
        return name;
}

BT_HIDDEN
void bt_ctf_stream_update_clock_value(struct bt_ctf_stream *stream,
                struct bt_ctf_field *value_field)
{
        struct bt_ctf_field_type *value_type = NULL;
        struct bt_ctf_clock *clock = NULL;
        uint64_t requested_new_value;
        uint64_t requested_new_value_mask;
        uint64_t *cur_value;
        uint64_t cur_value_masked;
        int requested_new_value_size;
        int ret;

        assert(stream);
        assert(clock);
        assert(value_field);
        value_type = bt_ctf_field_get_type(value_field);
        assert(value_type);
        clock = bt_ctf_field_type_integer_get_mapped_clock(value_type);
        assert(clock);
        requested_new_value_size =
                bt_ctf_field_type_integer_get_size(value_type);
        assert(requested_new_value_size > 0);
        ret = bt_ctf_field_unsigned_integer_get_value(value_field,
                &requested_new_value);
        assert(!ret);
        cur_value = g_hash_table_lookup(stream->clock_values, clock);

        if (!cur_value) {
                /*
                 * Updating the value of a clock which is not registered
                 * yet, so register it with the new value as its initial
                 * value.
                 */
                uint64_t *requested_new_value_ptr = g_new0(uint64_t, 1);

                *requested_new_value_ptr = requested_new_value;
                g_hash_table_insert(stream->clock_values, clock,
                        requested_new_value_ptr);
                goto end;
        }

        /*
         * Special case for a 64-bit new value, which is the limit
         * of a clock value as of this version: overwrite the
         * current value directly.
         */
        if (requested_new_value_size == 64) {
                *cur_value = requested_new_value;
                goto end;
        }

        requested_new_value_mask = (1ULL << requested_new_value_size) - 1;
        cur_value_masked = *cur_value & requested_new_value_mask;

        if (requested_new_value < cur_value_masked) {
                /*
                 * It looks like a wrap happened on the number of bits
                 * of the requested new value. Assume that the clock
                 * value wrapped only one time.
                 */
                *cur_value += requested_new_value_mask + 1;
        }

        /* Clear the low bits of the current clock value */
        *cur_value &= ~requested_new_value_mask;

        /* Set the low bits of the current clock value */
        *cur_value |= requested_new_value;

end:
        bt_put(clock);
        bt_put(value_type);
}