From: He Zhe <zhe...@windriver.com>
Backport a patch to fix negative clock offset with the following errors, when
when using lttng to view traces.
[error] ctf_clock_declaration_visit: unexpected unary expression for clock
offset
[error] ctf_visitor_construct_metadata: clock declaration error
[error] Error in CTF metadata constructor -22
Signed-off-by: He Zhe <zhe...@windriver.com>
---
meta/recipes-kernel/lttng/babeltrace_1.5.7.bb | 4 +-
...andle-negative-time-and-offset-from-Epoch.patch | 853 +++++++++++++++++++++
2 files changed, 856 insertions(+), 1 deletion(-)
create mode 100644
meta/recipes-kernel/lttng/files/0001-Handle-negative-time-and-offset-from-Epoch.patch
diff --git a/meta/recipes-kernel/lttng/babeltrace_1.5.7.bb
b/meta/recipes-kernel/lttng/babeltrace_1.5.7.bb
index 05ef6d0..4b9343d 100644
--- a/meta/recipes-kernel/lttng/babeltrace_1.5.7.bb
+++ b/meta/recipes-kernel/lttng/babeltrace_1.5.7.bb
@@ -7,7 +7,9 @@ LIC_FILES_CHKSUM =
"file://LICENSE;md5=76ba15dd76a248e1dd526bca0e2125fa"
DEPENDS = "glib-2.0 util-linux popt bison-native flex-native"
-SRC_URI =
"git://git.linuxfoundation.org/diamon/babeltrace.git;branch=stable-1.5"
+SRC_URI =
"git://git.linuxfoundation.org/diamon/babeltrace.git;branch=stable-1.5 \
+ file://0001-Handle-negative-time-and-offset-from-Epoch.patch \
+ "
SRCREV = "d4014aeef4b89a4aaab1af42d7b0d143d62da0ff"
UPSTREAM_CHECK_GITTAGREGEX = "v(?P<pver>\d+(\.\d+)+)$"
diff --git
a/meta/recipes-kernel/lttng/files/0001-Handle-negative-time-and-offset-from-Epoch.patch
b/meta/recipes-kernel/lttng/files/0001-Handle-negative-time-and-offset-from-Epoch.patch
new file mode 100644
index 0000000..f93fea7
--- /dev/null
+++
b/meta/recipes-kernel/lttng/files/0001-Handle-negative-time-and-offset-from-Epoch.patch
@@ -0,0 +1,853 @@
+From d6480f9dc6a6f6536da6c3df59006ba67ef0f622 Mon Sep 17 00:00:00 2001
+From: Mathieu Desnoyers <mathieu.desnoy...@efficios.com>
+Date: Wed, 14 Aug 2019 13:24:31 +0800
+Subject: [PATCH] Handle negative time and offset from Epoch
+
+Handle cases where a trace have a negative offset from Epoch.
+If Epoch is arbitrary (e.g. embedded system starting at 0, without any
+network access), the "0" can be used as correlation point between
+various components, and some components could start before the
+correlation point. Therefore, especially in traces where the time is
+meant to be shown in nanoseconds or cycles from the correlation point,
+it also makes sense to have a negative time value.
+
+It introduces API-breaking changes in the C and Python APIs, since we
+need to be able to return negative time values, which were previously
+used as errors (-1ULL).
+
+The --offset and --offset-ns command line parameters can now take
+negative offset (seconds and nanoseconds) values too.
+
+The [sec.ns] format is used as fallback so we don't attempt to pass
+a negative time value to POSIX time-formatting APIs.
+
+This also fixes an inaccurate return value in an error path of
+bt_ctf_event_populate_event_header().
+
+Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
+
+Upstream-Status: Backport[61cf588beae752e5ddfc60b6b5310f769ac9e852]
+
+Signed-off-by: He Zhe <zhe...@windriver.com>
+---
+ converter/babeltrace.c | 4 +-
+ formats/ctf-text/ctf-text.c | 2 +-
+ formats/ctf/ctf.c | 115 +++++++++++++++------
+ formats/ctf/events-private.h | 11 +-
+ formats/ctf/events.c | 11 +-
+ .../ctf/metadata/ctf-visitor-generate-io-struct.c | 2 +-
+ include/babeltrace/babeltrace-internal.h | 8 +-
+ include/babeltrace/clock-internal.h | 2 +-
+ include/babeltrace/ctf-ir/clock-internal.h | 2 +-
+ include/babeltrace/ctf/events.h | 8 +-
+ include/babeltrace/ctf/types.h | 6 +-
+ include/babeltrace/format.h | 10 +-
+ include/babeltrace/trace-handle-internal.h | 8 +-
+ include/babeltrace/trace-handle.h | 25 +++--
+ lib/context.c | 44 +++++---
+ lib/trace-handle.c | 40 +++----
+ tests/lib/test_ctf_writer.c | 6 +-
+ tests/lib/test_seek.c | 26 ++---
+ 18 files changed, 209 insertions(+), 121 deletions(-)
+
+diff --git a/converter/babeltrace.c b/converter/babeltrace.c
+index ef783ed..2ac1617 100644
+--- a/converter/babeltrace.c
++++ b/converter/babeltrace.c
+@@ -375,7 +375,7 @@ static int parse_options(int argc, char **argv)
+ goto end;
+ }
+ errno = 0;
+- opt_clock_offset = strtoull(str, &endptr, 0);
++ opt_clock_offset = strtoll(str, &endptr, 0);
+ if (*endptr != '\0' || str == endptr || errno != 0) {
+ fprintf(stderr, "[error] Incorrect
--clock-offset argument: %s\n", str);
+ ret = -EINVAL;
+@@ -400,7 +400,7 @@ static int parse_options(int argc, char **argv)
+ goto end;
+ }
+ errno = 0;
+- opt_clock_offset_ns = strtoull(str, &endptr, 0);
++ opt_clock_offset_ns = strtoll(str, &endptr, 0);
+ if (*endptr != '\0' || str == endptr || errno != 0) {
+ fprintf(stderr, "[error] Incorrect
--clock-offset-ns argument: %s\n", str);
+ ret = -EINVAL;
+diff --git a/formats/ctf-text/ctf-text.c b/formats/ctf-text/ctf-text.c
+index 16f156d..e001a54 100644
+--- a/formats/ctf-text/ctf-text.c
++++ b/formats/ctf-text/ctf-text.c
+@@ -43,7 +43,7 @@
+ #include <unistd.h>
+ #include <stdlib.h>
+
+-#define NSEC_PER_SEC 1000000000ULL
++#define NSEC_PER_SEC 1000000000LL
+
+ int opt_all_field_names,
+ opt_scope_field_names,
+diff --git a/formats/ctf/ctf.c b/formats/ctf/ctf.c
+index 980ebc9..f2d4c64 100644
+--- a/formats/ctf/ctf.c
++++ b/formats/ctf/ctf.c
+@@ -70,7 +70,7 @@
+ */
+ #define WRITE_PACKET_LEN (getpagesize() * 8 * CHAR_BIT)
+
+-#define NSEC_PER_SEC 1000000000ULL
++#define NSEC_PER_SEC 1000000000LL
+
+ #define INDEX_PATH "./index/%s.idx"
+
+@@ -79,8 +79,8 @@ int opt_clock_cycles,
+ opt_clock_date,
+ opt_clock_gmt;
+
+-uint64_t opt_clock_offset;
+-uint64_t opt_clock_offset_ns;
++int64_t opt_clock_offset;
++int64_t opt_clock_offset_ns;
+
+ extern int yydebug;
+ char *opt_debug_info_dir;
+@@ -114,11 +114,13 @@ void ctf_set_handle(struct bt_trace_descriptor
*descriptor,
+ static
+ int ctf_close_trace(struct bt_trace_descriptor *descriptor);
+ static
+-uint64_t ctf_timestamp_begin(struct bt_trace_descriptor *descriptor,
+- struct bt_trace_handle *handle, enum bt_clock_type type);
++int ctf_timestamp_begin(struct bt_trace_descriptor *descriptor,
++ struct bt_trace_handle *handle, enum bt_clock_type type,
++ int64_t *timestamp);
+ static
+-uint64_t ctf_timestamp_end(struct bt_trace_descriptor *descriptor,
+- struct bt_trace_handle *handle, enum bt_clock_type type);
++int ctf_timestamp_end(struct bt_trace_descriptor *descriptor,
++ struct bt_trace_handle *handle, enum bt_clock_type type,
++ int64_t *timestamp);
+ static
+ int ctf_convert_index_timestamp(struct bt_trace_descriptor *tdp);
+
+@@ -167,17 +169,20 @@ void bt_ctf_hook(void)
+ }
+
+ static
+-uint64_t ctf_timestamp_begin(struct bt_trace_descriptor *descriptor,
+- struct bt_trace_handle *handle, enum bt_clock_type type)
++int ctf_timestamp_begin(struct bt_trace_descriptor *descriptor,
++ struct bt_trace_handle *handle, enum bt_clock_type type,
++ int64_t *timestamp)
+ {
+ struct ctf_trace *tin;
+- uint64_t begin = ULLONG_MAX;
+- int i, j;
++ int64_t begin = LLONG_MAX;
++ int i, j, ret;
+
+ tin = container_of(descriptor, struct ctf_trace, parent);
+
+- if (!tin)
++ if (!tin || !timestamp) {
++ ret = -EINVAL;
+ goto error;
++ }
+
+ /* for each stream_class */
+ for (i = 0; i < tin->streams->len; i++) {
+@@ -198,8 +203,10 @@ uint64_t ctf_timestamp_begin(struct bt_trace_descriptor
*descriptor,
+ parent);
+ stream_pos = &cfs->pos;
+
+- if (!stream_pos->packet_index)
++ if (!stream_pos->packet_index) {
++ ret = -EINVAL;
+ goto error;
++ }
+
+ if (stream_pos->packet_index->len <= 0)
+ continue;
+@@ -214,29 +221,38 @@ uint64_t ctf_timestamp_begin(struct bt_trace_descriptor
*descriptor,
+ if (index->ts_cycles.timestamp_begin < begin)
+ begin =
index->ts_cycles.timestamp_begin;
+ } else {
++ ret = -EINVAL;
+ goto error;
+ }
+ }
+ }
+
+- return begin;
++ if (begin == LLONG_MAX) {
++ ret = -ENOENT;
++ goto error;
++ }
++ *timestamp = begin;
++ return 0;
+
+ error:
+- return -1ULL;
++ return ret;
+ }
+
+ static
+-uint64_t ctf_timestamp_end(struct bt_trace_descriptor *descriptor,
+- struct bt_trace_handle *handle, enum bt_clock_type type)
++int ctf_timestamp_end(struct bt_trace_descriptor *descriptor,
++ struct bt_trace_handle *handle, enum bt_clock_type type,
++ int64_t *timestamp)
+ {
+ struct ctf_trace *tin;
+- uint64_t end = 0;
+- int i, j;
++ int64_t end = LLONG_MIN;
++ int i, j, ret;
+
+ tin = container_of(descriptor, struct ctf_trace, parent);
+
+- if (!tin)
++ if (!tin || !timestamp) {
++ ret = -EINVAL;
+ goto error;
++ }
+
+ /* for each stream_class */
+ for (i = 0; i < tin->streams->len; i++) {
+@@ -257,8 +273,10 @@ uint64_t ctf_timestamp_end(struct bt_trace_descriptor
*descriptor,
+ parent);
+ stream_pos = &cfs->pos;
+
+- if (!stream_pos->packet_index)
++ if (!stream_pos->packet_index) {
++ ret = -EINVAL;
+ goto error;
++ }
+
+ if (stream_pos->packet_index->len <= 0)
+ continue;
+@@ -273,15 +291,21 @@ uint64_t ctf_timestamp_end(struct bt_trace_descriptor
*descriptor,
+ if (index->ts_cycles.timestamp_end > end)
+ end = index->ts_cycles.timestamp_end;
+ } else {
++ ret = -EINVAL;
+ goto error;
+ }
+ }
+ }
+
+- return end;
++ if (end == LLONG_MIN) {
++ ret = -ENOENT;
++ goto error;
++ }
++ *timestamp = end;
++ return 0;
+
+ error:
+- return -1ULL;
++ return ret;
+ }
+
+ /*
+@@ -328,7 +352,9 @@ void ctf_print_timestamp_real(FILE *fp,
+ struct ctf_stream_definition *stream,
+ uint64_t timestamp)
+ {
+- uint64_t ts_sec = 0, ts_nsec;
++ int64_t ts_sec = 0, ts_nsec;
++ uint64_t ts_sec_abs, ts_nsec_abs;
++ bool is_negative;
+
+ ts_nsec = timestamp;
+
+@@ -341,9 +367,40 @@ void ctf_print_timestamp_real(FILE *fp,
+ ts_sec += ts_nsec / NSEC_PER_SEC;
+ ts_nsec = ts_nsec % NSEC_PER_SEC;
+
++ if (ts_sec >= 0 && ts_nsec >= 0) {
++ is_negative = false;
++ ts_sec_abs = ts_sec;
++ ts_nsec_abs = ts_nsec;
++ } else if (ts_sec > 0 && ts_nsec < 0) {
++ is_negative = false;
++ ts_sec_abs = ts_sec - 1;
++ ts_nsec_abs = NSEC_PER_SEC + ts_nsec;
++ } else if (ts_sec == 0 && ts_nsec < 0) {
++ is_negative = true;
++ ts_sec_abs = ts_sec;
++ ts_nsec_abs = -ts_nsec;
++ } else if (ts_sec < 0 && ts_nsec > 0) {
++ is_negative = true;
++ ts_sec_abs = -(ts_sec + 1);
++ ts_nsec_abs = NSEC_PER_SEC - ts_nsec;
++ } else if (ts_sec < 0 && ts_nsec == 0) {
++ is_negative = true;
++ ts_sec_abs = -ts_sec;
++ ts_nsec_abs = ts_nsec;
++ } else { /* (ts_sec < 0 && ts_nsec < 0) */
++ is_negative = true;
++ ts_sec_abs = -ts_sec;
++ ts_nsec_abs = -ts_nsec;
++ }
++
+ if (!opt_clock_seconds) {
+ struct tm tm;
+- time_t time_s = (time_t) ts_sec;
++ time_t time_s = (time_t) ts_sec_abs;
++
++ if (is_negative) {
++ fprintf(stderr, "[warning] Fallback to [sec.ns] for
printing negative time value. Use --clock-seconds.\n");
++ goto seconds;
++ }
+
+ if (!opt_clock_gmt) {
+ struct tm *res;
+@@ -377,12 +434,12 @@ void ctf_print_timestamp_real(FILE *fp,
+ }
+ /* Print time in HH:MM:SS.ns */
+ fprintf(fp, "%02d:%02d:%02d.%09" PRIu64,
+- tm.tm_hour, tm.tm_min, tm.tm_sec, ts_nsec);
++ tm.tm_hour, tm.tm_min, tm.tm_sec, ts_nsec_abs);
+ goto end;
+ }
+ seconds:
+- fprintf(fp, "%3" PRIu64 ".%09" PRIu64,
+- ts_sec, ts_nsec);
++ fprintf(fp, "%s%" PRId64 ".%09" PRIu64,
++ is_negative ? "-" : "", ts_sec_abs, ts_nsec_abs);
+
+ end:
+ return;
+@@ -401,7 +458,7 @@ void ctf_print_timestamp_cycles(FILE *fp,
+
+ void ctf_print_timestamp(FILE *fp,
+ struct ctf_stream_definition *stream,
+- uint64_t timestamp)
++ int64_t timestamp)
+ {
+ if (opt_clock_cycles) {
+ ctf_print_timestamp_cycles(fp, stream, timestamp);
+diff --git a/formats/ctf/events-private.h b/formats/ctf/events-private.h
+index 9bea75d..8acdcfa 100644
+--- a/formats/ctf/events-private.h
++++ b/formats/ctf/events-private.h
+@@ -35,20 +35,19 @@
+ #include <babeltrace/clock-internal.h>
+
+ static inline
+-uint64_t ctf_get_real_timestamp(struct ctf_stream_definition *stream,
+- uint64_t timestamp)
++int64_t ctf_get_real_timestamp(struct ctf_stream_definition *stream,
++ uint64_t ts_cycles)
+ {
+- uint64_t ts_nsec;
++ int64_t ts_nsec;
+ struct ctf_trace *trace = stream->stream_class->trace;
+ struct trace_collection *tc = trace->parent.collection;
+- uint64_t tc_offset;
++ int64_t tc_offset;
+
+ if (tc->clock_use_offset_avg)
+ tc_offset = tc->single_clock_offset_avg;
+ else
+ tc_offset = clock_offset_ns(trace->parent.single_clock);
+-
+- ts_nsec = clock_cycles_to_ns(stream->current_clock, timestamp);
++ ts_nsec = clock_cycles_to_ns(stream->current_clock, ts_cycles);
+ ts_nsec += tc_offset; /* Add offset */
+ return ts_nsec;
+ }
+diff --git a/formats/ctf/events.c b/formats/ctf/events.c
+index bd195b9..010b937 100644
+--- a/formats/ctf/events.c
++++ b/formats/ctf/events.c
+@@ -315,18 +315,19 @@ int bt_ctf_event_get_handle_id(const struct bt_ctf_event
*ctf_event)
+ return ret;
+ }
+
+-uint64_t bt_ctf_get_timestamp(const struct bt_ctf_event *ctf_event)
++int bt_ctf_get_timestamp(const struct bt_ctf_event *ctf_event, int64_t
*timestamp)
+ {
+ const struct ctf_event_definition *event;
+
+- if (!ctf_event)
+- return -1ULL;
++ if (!ctf_event || !timestamp)
++ return -1;
+
+ event = ctf_event->parent;
+ if (event && event->stream->has_timestamp)
+- return event->stream->real_timestamp;
++ *timestamp = event->stream->real_timestamp;
+ else
+- return -1ULL;
++ return -1;
++ return 0;
+ }
+
+ uint64_t bt_ctf_get_cycles(const struct bt_ctf_event *ctf_event)
+diff --git a/formats/ctf/metadata/ctf-visitor-generate-io-struct.c
b/formats/ctf/metadata/ctf-visitor-generate-io-struct.c
+index 8d348d6..036bb26 100644
+--- a/formats/ctf/metadata/ctf-visitor-generate-io-struct.c
++++ b/formats/ctf/metadata/ctf-visitor-generate-io-struct.c
+@@ -217,9 +217,9 @@ int get_unary_signed(struct bt_list_head *head, int64_t
*value)
+ struct ctf_node *node;
+ int i = 0;
+
++
+ bt_list_for_each_entry(node, head, siblings) {
+ if (node->type != NODE_UNARY_EXPRESSION
+- || node->u.unary_expression.type !=
UNARY_UNSIGNED_CONSTANT
+ || (node->u.unary_expression.type !=
UNARY_UNSIGNED_CONSTANT && node->u.unary_expression.type !=
UNARY_SIGNED_CONSTANT)
+ || node->u.unary_expression.link !=
UNARY_LINK_UNKNOWN
+ || i != 0)
+diff --git a/include/babeltrace/babeltrace-internal.h
b/include/babeltrace/babeltrace-internal.h
+index 6f8e200..3e137e4 100644
+--- a/include/babeltrace/babeltrace-internal.h
++++ b/include/babeltrace/babeltrace-internal.h
+@@ -178,8 +178,8 @@ struct trace_collection {
+ GPtrArray *array; /* struct bt_trace_descriptor */
+ GHashTable *clocks; /* struct ctf_clock */
+
+- uint64_t single_clock_offset_avg;
+- uint64_t offset_first;
++ int64_t single_clock_offset_avg;
++ int64_t offset_first;
+ int64_t delta_offset_first_sum;
+ int offset_nr;
+ int clock_use_offset_avg;
+@@ -208,8 +208,8 @@ extern int opt_all_field_names,
+ opt_clock_force_correlate,
+ opt_debug_info_full_path;
+
+-extern uint64_t opt_clock_offset;
+-extern uint64_t opt_clock_offset_ns;
++extern int64_t opt_clock_offset;
++extern int64_t opt_clock_offset_ns;
+ extern int babeltrace_ctf_console_output;
+ extern char *opt_debug_info_dir;
+ extern char *opt_debug_info_target_prefix;
+diff --git a/include/babeltrace/clock-internal.h
b/include/babeltrace/clock-internal.h
+index cd6bdba..86954b7 100644
+--- a/include/babeltrace/clock-internal.h
++++ b/include/babeltrace/clock-internal.h
+@@ -49,7 +49,7 @@ uint64_t clock_cycles_to_ns(struct ctf_clock *clock,
uint64_t cycles)
+ * mantissa.
+ */
+ static inline
+-uint64_t clock_offset_ns(struct ctf_clock *clock)
++int64_t clock_offset_ns(struct ctf_clock *clock)
+ {
+ return clock->offset_s * 1000000000ULL
+ + clock_cycles_to_ns(clock, clock->offset);
+diff --git a/include/babeltrace/ctf-ir/clock-internal.h
b/include/babeltrace/ctf-ir/clock-internal.h
+index 7567770..f1e896b 100644
+--- a/include/babeltrace/ctf-ir/clock-internal.h
++++ b/include/babeltrace/ctf-ir/clock-internal.h
+@@ -42,7 +42,7 @@ struct bt_ctf_clock {
+ uint64_t precision;
+ int64_t offset_s; /* Offset in seconds */
+ int64_t offset; /* Offset in ticks */
+- uint64_t value; /* Current clock value */
++ int64_t value; /* Current clock value */
+ uuid_t uuid;
+ int uuid_set;
+ int absolute;
+diff --git a/include/babeltrace/ctf/events.h b/include/babeltrace/ctf/events.h
+index c81d885..15830a3 100644
+--- a/include/babeltrace/ctf/events.h
++++ b/include/babeltrace/ctf/events.h
+@@ -109,10 +109,12 @@ const char *bt_ctf_event_name(const struct bt_ctf_event
*event);
+ uint64_t bt_ctf_get_cycles(const struct bt_ctf_event *event);
+
+ /*
+- * bt_ctf_get_timestamp: returns the timestamp of the event offsetted
+- * with the system clock source (in ns) or -1ULL on error
++ * bt_ctf_get_timestamp: get the timestamp of the event offsetted
++ * with the system clock source (in ns) in *timestamp.
++ *
++ * Return 0 on success, or -1ULL on error.
+ */
+-uint64_t bt_ctf_get_timestamp(const struct bt_ctf_event *event);
++int bt_ctf_get_timestamp(const struct bt_ctf_event *event, int64_t
*timestamp);
+
+ /*
+ * bt_ctf_get_field_list: obtain the list of fields for compound type
+diff --git a/include/babeltrace/ctf/types.h b/include/babeltrace/ctf/types.h
+index 0bc003c..4b626b3 100644
+--- a/include/babeltrace/ctf/types.h
++++ b/include/babeltrace/ctf/types.h
+@@ -46,8 +46,8 @@
+ struct bt_stream_callbacks;
+
+ struct packet_index_time {
+- uint64_t timestamp_begin;
+- uint64_t timestamp_end;
++ int64_t timestamp_begin;
++ int64_t timestamp_end;
+ };
+
+ struct packet_index {
+@@ -253,7 +253,7 @@ int ctf_pos_get_event(struct ctf_stream_pos *pos)
+ }
+
+ void ctf_print_timestamp(FILE *fp, struct ctf_stream_definition *stream,
+- uint64_t timestamp);
++ int64_t timestamp);
+ int ctf_append_trace_metadata(struct bt_trace_descriptor *tdp,
+ FILE *metadata_fp);
+ void ctf_print_discarded_lost(FILE *fp, struct ctf_stream_definition *stream);
+diff --git a/include/babeltrace/format.h b/include/babeltrace/format.h
+index dea8e0e..bf33a23 100644
+--- a/include/babeltrace/format.h
++++ b/include/babeltrace/format.h
+@@ -73,10 +73,12 @@ struct bt_format {
+ struct bt_context *ctx);
+ void (*set_handle)(struct bt_trace_descriptor *descriptor,
+ struct bt_trace_handle *handle);
+- uint64_t (*timestamp_begin)(struct bt_trace_descriptor *descriptor,
+- struct bt_trace_handle *handle, enum bt_clock_type
type);
+- uint64_t (*timestamp_end)(struct bt_trace_descriptor *descriptor,
+- struct bt_trace_handle *handle, enum bt_clock_type
type);
++ int (*timestamp_begin)(struct bt_trace_descriptor *descriptor,
++ struct bt_trace_handle *handle, enum bt_clock_type
type,
++ int64_t *timestamp);
++ int (*timestamp_end)(struct bt_trace_descriptor *descriptor,
++ struct bt_trace_handle *handle, enum bt_clock_type
type,
++ int64_t *timestamp);
+ int (*convert_index_timestamp)(struct bt_trace_descriptor *descriptor);
+ };
+
+diff --git a/include/babeltrace/trace-handle-internal.h
b/include/babeltrace/trace-handle-internal.h
+index 5e9c1c6..924c730 100644
+--- a/include/babeltrace/trace-handle-internal.h
++++ b/include/babeltrace/trace-handle-internal.h
+@@ -46,10 +46,10 @@ struct bt_trace_handle {
+ struct bt_trace_descriptor *td;
+ struct bt_format *format;
+ char path[PATH_MAX];
+- uint64_t real_timestamp_begin;
+- uint64_t real_timestamp_end;
+- uint64_t cycles_timestamp_begin;
+- uint64_t cycles_timestamp_end;
++ int64_t real_timestamp_begin;
++ int64_t real_timestamp_end;
++ int64_t cycles_timestamp_begin;
++ int64_t cycles_timestamp_end;
+ };
+
+ /*
+diff --git a/include/babeltrace/trace-handle.h
b/include/babeltrace/trace-handle.h
+index 96e4a81..f6d7af8 100644
+--- a/include/babeltrace/trace-handle.h
++++ b/include/babeltrace/trace-handle.h
+@@ -53,20 +53,25 @@ struct bt_ctf_event;
+ const char *bt_trace_handle_get_path(struct bt_context *ctx, int handle_id);
+
+ /*
+- * bt_trace_handle_get_timestamp_begin : returns the creation time (in
+- * nanoseconds or cycles depending on type) of the buffers of a trace
+- * or -1ULL on error.
++ * bt_trace_handle_get_timestamp_begin : get the creation time (in
++ * nanoseconds or cycles depending on type) of the buffers of a trace.
++ *
++ * Returns 0 on success, -1 on error.
+ */
+-uint64_t bt_trace_handle_get_timestamp_begin(struct bt_context *ctx,
+- int handle_id, enum bt_clock_type type);
++int bt_trace_handle_get_timestamp_begin(struct bt_context *ctx,
++ int handle_id, enum bt_clock_type type,
++ int64_t *timestamp);
+
+ /*
+- * bt_trace_handle_get_timestamp_end : returns the destruction timestamp
+- * (in nanoseconds or cycles depending on type) of the buffers of a trace
+- * or -1ULL on error.
++ * bt_trace_handle_get_timestamp_end : get the destruction time
++ * (in nanoseconds or cycles depending on type) of the buffers of a
++ * trace.
++ *
++ * Returns 0 on success, -1 on error.
+ */
+-uint64_t bt_trace_handle_get_timestamp_end(struct bt_context *ctx,
+- int handle_id, enum bt_clock_type type);
++int bt_trace_handle_get_timestamp_end(struct bt_context *ctx,
++ int handle_id, enum bt_clock_type type,
++ int64_t *timestamp);
+
+ /*
+ * bt_ctf_event_get_handle_id : get the handle id associated with an event
+diff --git a/lib/context.c b/lib/context.c
+index 87901b3..34a1bc8 100644
+--- a/lib/context.c
++++ b/lib/context.c
+@@ -139,18 +139,38 @@ int bt_context_add_trace(struct bt_context *ctx, const
char *path,
+ goto error_collection_del;
+ }
+
+- if (fmt->timestamp_begin)
+- handle->real_timestamp_begin = fmt->timestamp_begin(td,
+- handle, BT_CLOCK_REAL);
+- if (fmt->timestamp_end)
+- handle->real_timestamp_end = fmt->timestamp_end(td, handle,
+- BT_CLOCK_REAL);
+- if (fmt->timestamp_begin)
+- handle->cycles_timestamp_begin = fmt->timestamp_begin(td,
+- handle, BT_CLOCK_CYCLES);
+- if (fmt->timestamp_end)
+- handle->cycles_timestamp_end = fmt->timestamp_end(td, handle,
+- BT_CLOCK_CYCLES);
++ if (fmt->timestamp_begin) {
++ ret = fmt->timestamp_begin(td, handle, BT_CLOCK_REAL,
++ &handle->real_timestamp_begin);
++ if (ret < 0 && ret != -ENOENT) {
++ ret = -1;
++ goto error_collection_del;
++ }
++ }
++ if (fmt->timestamp_end) {
++ ret = fmt->timestamp_end(td, handle, BT_CLOCK_REAL,
++ &handle->real_timestamp_end);
++ if (ret < 0 && ret != -ENOENT) {
++ ret = -1;
++ goto error_collection_del;
++ }
++ }
++ if (fmt->timestamp_begin) {
++ ret = fmt->timestamp_begin(td, handle, BT_CLOCK_CYCLES,
++ &handle->cycles_timestamp_begin);
++ if (ret < 0 && ret != -ENOENT) {
++ ret = -1;
++ goto error_collection_del;
++ }
++ }
++ if (fmt->timestamp_end) {
++ ret = fmt->timestamp_end(td, handle, BT_CLOCK_CYCLES,
++ &handle->cycles_timestamp_end);
++ if (ret < 0 && ret != -ENOENT) {
++ ret = -1;
++ goto error_collection_del;
++ }
++ }
+
+ /* Add new handle to container */
+ g_hash_table_insert(ctx->trace_handles,
+diff --git a/lib/trace-handle.c b/lib/trace-handle.c
+index d5b906a..0fa7494 100644
+--- a/lib/trace-handle.c
++++ b/lib/trace-handle.c
+@@ -66,54 +66,56 @@ const char *bt_trace_handle_get_path(struct bt_context
*ctx, int handle_id)
+ return handle->path;
+ }
+
+-uint64_t bt_trace_handle_get_timestamp_begin(struct bt_context *ctx,
+- int handle_id, enum bt_clock_type type)
++int bt_trace_handle_get_timestamp_begin(struct bt_context *ctx,
++ int handle_id, enum bt_clock_type type,
++ int64_t *timestamp)
+ {
+ struct bt_trace_handle *handle;
+- uint64_t ret;
+-
+- if (!ctx)
+- return -1ULL;
++ int ret = 0;
++
++ if (!ctx || !timestamp)
++ return -1;
+
+ handle = g_hash_table_lookup(ctx->trace_handles,
+ (gpointer) (unsigned long) handle_id);
+ if (!handle) {
+- ret = -1ULL;
++ ret = -1;
+ goto end;
+ }
+ if (type == BT_CLOCK_REAL) {
+- ret = handle->real_timestamp_begin;
++ *timestamp = handle->real_timestamp_begin;
+ } else if (type == BT_CLOCK_CYCLES) {
+- ret = handle->cycles_timestamp_begin;
++ *timestamp = handle->cycles_timestamp_begin;
+ } else {
+- ret = -1ULL;
++ ret = -1;
+ }
+
+ end:
+ return ret;
+ }
+
+-uint64_t bt_trace_handle_get_timestamp_end(struct bt_context *ctx,
+- int handle_id, enum bt_clock_type type)
++int bt_trace_handle_get_timestamp_end(struct bt_context *ctx,
++ int handle_id, enum bt_clock_type type,
++ int64_t *timestamp)
+ {
+ struct bt_trace_handle *handle;
+- uint64_t ret;
++ int ret = 0;
+
+- if (!ctx)
+- return -1ULL;
++ if (!ctx || !timestamp)
++ return -1;
+
+ handle = g_hash_table_lookup(ctx->trace_handles,
+ (gpointer) (unsigned long) handle_id);
+ if (!handle) {
+- ret = -1ULL;
++ ret = -1;
+ goto end;
+ }
+ if (type == BT_CLOCK_REAL) {
+- ret = handle->real_timestamp_end;
++ *timestamp = handle->real_timestamp_end;
+ } else if (type == BT_CLOCK_CYCLES) {
+- ret = handle->cycles_timestamp_end;
++ *timestamp = handle->cycles_timestamp_end;
+ } else {
+- ret = -1ULL;
++ ret = -1;
+ }
+
+ end:
+diff --git a/tests/lib/test_ctf_writer.c b/tests/lib/test_ctf_writer.c
+index 53613c9..29d76df 100644
+--- a/tests/lib/test_ctf_writer.c
++++ b/tests/lib/test_ctf_writer.c
+@@ -45,7 +45,7 @@
+ #define SEQUENCE_TEST_LENGTH 10
+ #define PACKET_RESIZE_TEST_LENGTH 100000
+
+-static uint64_t current_time;
++static int64_t current_time;
+
+ void validate_metadata(char *parser_path, char *metadata_path)
+ {
+@@ -695,8 +695,8 @@ int main(int argc, char **argv)
+ const char *clock_name = "test_clock";
+ const char *clock_description = "This is a test clock";
+ const uint64_t frequency = 1000000000;
+- const uint64_t offset_s = 1351530929945824323;
+- const uint64_t offset = 1234567;
++ const int64_t offset_s = 1351530929945824323;
++ const int64_t offset = 1234567;
+ const uint64_t precision = 10;
+ char *metadata_string;
+ struct bt_ctf_writer *writer;
+diff --git a/tests/lib/test_seek.c b/tests/lib/test_seek.c
+index 3c78e8a..81a72a2 100644
+--- a/tests/lib/test_seek.c
++++ b/tests/lib/test_seek.c
+@@ -33,7 +33,7 @@
+ #include <tap/tap.h>
+ #include "common.h"
+
+-#define NR_TESTS 29
++#define NR_TESTS 36
+
+ void run_seek_begin(char *path, uint64_t expected_begin)
+ {
+@@ -42,8 +42,8 @@ void run_seek_begin(char *path, uint64_t expected_begin)
+ struct bt_ctf_event *event;
+ struct bt_iter_pos newpos;
+ int ret;
+- uint64_t timestamp_begin;
+- uint64_t timestamp_seek_begin;
++ int64_t timestamp_begin;
++ int64_t timestamp_seek_begin;
+ unsigned int nr_seek_begin_test;
+
+ nr_seek_begin_test = 5;
+@@ -67,7 +67,7 @@ void run_seek_begin(char *path, uint64_t expected_begin)
+ ok(event, "Event valid");
+
+ /* Validate that the first timestamp is right */
+- timestamp_begin = bt_ctf_get_timestamp(event);
++ ok1(bt_ctf_get_timestamp(event, ×tamp_begin) == 0);
+
+ ok1(timestamp_begin == expected_begin);
+
+@@ -81,7 +81,7 @@ void run_seek_begin(char *path, uint64_t expected_begin)
+
+ ok(event, "Event valid");
+
+- timestamp_seek_begin = bt_ctf_get_timestamp(event);
++ ok1(bt_ctf_get_timestamp(event, ×tamp_seek_begin) == 0);
+
+ ok1(timestamp_begin == timestamp_seek_begin);
+
+@@ -96,7 +96,7 @@ void run_seek_last(char *path, uint64_t expected_last)
+ struct bt_ctf_event *event;
+ struct bt_iter_pos newpos;
+ int ret;
+- uint64_t timestamp_last;
++ int64_t timestamp_last;
+ unsigned int nr_seek_last_tests;
+
+ nr_seek_last_tests = 6;
+@@ -129,7 +129,7 @@ void run_seek_last(char *path, uint64_t expected_last)
+
+ ok(event, "Event valid at last position");
+
+- timestamp_last = bt_ctf_get_timestamp(event);
++ ok1(bt_ctf_get_timestamp(event, ×tamp_last) == 0);
+
+ ok1(timestamp_last == expected_last);
+
+@@ -152,7 +152,7 @@ void run_seek_time_at_last(char *path, uint64_t
expected_last)
+ struct bt_ctf_event *event;
+ struct bt_iter_pos newpos;
+ int ret;
+- uint64_t timestamp_last;
++ int64_t timestamp_last;
+ unsigned int nr_seek_time_at_last_tests;
+
+ nr_seek_time_at_last_tests = 6;
+@@ -188,7 +188,7 @@ void run_seek_time_at_last(char *path, uint64_t
expected_last)
+
+ ok(event, "Event valid at last position");
+
+- timestamp_last = bt_ctf_get_timestamp(event);
++ ok1(bt_ctf_get_timestamp(event, ×tamp_last) == 0);
+
+ ok1(timestamp_last == expected_last);
+
+@@ -213,7 +213,7 @@ void run_seek_cycles(char *path,
+ struct bt_ctf_event *event;
+ struct bt_iter_pos newpos;
+ int ret;
+- uint64_t timestamp;
++ int64_t timestamp;
+
+ unsigned int nr_seek_cycles_tests;
+
+@@ -247,7 +247,7 @@ void run_seek_cycles(char *path,
+
+ ok(event, "Event valid at last position");
+
+- timestamp = bt_ctf_get_timestamp(event);
++ ok1(bt_ctf_get_timestamp(event, ×tamp) == 0);
+
+ ok1(timestamp == expected_last);
+
+@@ -270,7 +270,7 @@ void run_seek_cycles(char *path,
+
+ ok(event, "Event valid at first position");
+
+- timestamp = bt_ctf_get_timestamp(event);
++ ok1(bt_ctf_get_timestamp(event, ×tamp) == 0);
+
+ ok1(timestamp == expected_begin);
+
+@@ -284,7 +284,7 @@ void run_seek_cycles(char *path,
+
+ ok(event, "Event valid at last position");
+
+- timestamp = bt_ctf_get_timestamp(event);
++ ok1(bt_ctf_get_timestamp(event, ×tamp) == 0);
+
+ ok1(timestamp == expected_last);
+
+--
+2.7.4
+
--
2.7.4
--
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