| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Thu, 12 Dec 2013 16:36:17 +0900
From: Namhyung Kim <namhyung@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc: Frederic Weisbecker <fweisbec@...il.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Ingo Molnar <mingo@...nel.org>,
Namhyung Kim <namhyung.kim@....com>,
LKML <linux-kernel@...r.kernel.org>, Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH 14/14] tools lib traceevent: Introduce pevent_filter_strerror()
From: Namhyung Kim <namhyung.kim@....com>
The pevent_filter_strerror() function is for receiving actual error
message from pevent_errno value. To do that, add a static buffer to
event_filter for saving internal error message
If a failed function saved other information in the static buffer
returns the information, otherwise returns generic error message.
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
tools/lib/traceevent/event-parse.c | 17 +------
tools/lib/traceevent/event-parse.h | 7 ++-
tools/lib/traceevent/parse-filter.c | 98 ++++++++++++++++++++-----------------
3 files changed, 61 insertions(+), 61 deletions(-)
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 22566c271275..2ce565a73dd5 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -5230,22 +5230,7 @@ int pevent_strerror(struct pevent *pevent __maybe_unused,
idx = errnum - __PEVENT_ERRNO__START - 1;
msg = pevent_error_str[idx];
-
- switch (errnum) {
- case PEVENT_ERRNO__MEM_ALLOC_FAILED:
- case PEVENT_ERRNO__PARSE_EVENT_FAILED:
- case PEVENT_ERRNO__READ_ID_FAILED:
- case PEVENT_ERRNO__READ_FORMAT_FAILED:
- case PEVENT_ERRNO__READ_PRINT_FAILED:
- case PEVENT_ERRNO__OLD_FTRACE_ARG_FAILED:
- case PEVENT_ERRNO__INVALID_ARG_TYPE:
- snprintf(buf, buflen, "%s", msg);
- break;
-
- default:
- /* cannot reach here */
- break;
- }
+ snprintf(buf, buflen, "%s", msg);
return 0;
}
diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
index 3ad784f5f647..cf5db9013f2c 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -851,10 +851,13 @@ struct filter_type {
struct filter_arg *filter;
};
+#define PEVENT_FILTER_ERROR_BUFSZ 1024
+
struct event_filter {
struct pevent *pevent;
int filters;
struct filter_type *event_filters;
+ char error_buffer[PEVENT_FILTER_ERROR_BUFSZ];
};
struct event_filter *pevent_filter_alloc(struct pevent *pevent);
@@ -874,10 +877,12 @@ enum filter_trivial_type {
enum pevent_errno pevent_filter_add_filter_str(struct event_filter *filter,
const char *filter_str);
-
enum pevent_errno pevent_filter_match(struct event_filter *filter,
struct pevent_record *record);
+int pevent_filter_strerror(struct event_filter *filter, enum pevent_errno err,
+ char *buf, size_t buflen);
+
int pevent_event_filtered(struct event_filter *filter,
int event_id);
diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
index 32ab4396653c..c28b1a912a0c 100644
--- a/tools/lib/traceevent/parse-filter.c
+++ b/tools/lib/traceevent/parse-filter.c
@@ -38,55 +38,31 @@ struct event_list {
struct event_format *event;
};
-#define MAX_ERR_STR_SIZE 256
-
-static void show_error(char **error_str, const char *fmt, ...)
+static void show_error(char *error_buf, const char *fmt, ...)
{
unsigned long long index;
const char *input;
- char *error;
va_list ap;
int len;
int i;
- if (!error_str)
- return;
-
input = pevent_get_input_buf();
index = pevent_get_input_buf_ptr();
len = input ? strlen(input) : 0;
- error = malloc(MAX_ERR_STR_SIZE + (len*2) + 3);
- if (error == NULL) {
- /*
- * Maybe it's due to len is too long.
- * Retry without the input buffer part.
- */
- len = 0;
-
- error = malloc(MAX_ERR_STR_SIZE);
- if (error == NULL) {
- /* no memory */
- *error_str = NULL;
- return;
- }
- }
-
if (len) {
- strcpy(error, input);
- error[len] = '\n';
+ strcpy(error_buf, input);
+ error_buf[len] = '\n';
for (i = 1; i < len && i < index; i++)
- error[len+i] = ' ';
- error[len + i] = '^';
- error[len + i + 1] = '\n';
+ error_buf[len+i] = ' ';
+ error_buf[len + i] = '^';
+ error_buf[len + i + 1] = '\n';
len += i+2;
}
va_start(ap, fmt);
- vsnprintf(error + len, MAX_ERR_STR_SIZE, fmt, ap);
+ vsnprintf(error_buf + len, PEVENT_FILTER_ERROR_BUFSZ - len, fmt, ap);
va_end(ap);
-
- *error_str = error;
}
static void free_token(char *token)
@@ -370,7 +346,7 @@ static void free_events(struct event_list *events)
static enum pevent_errno
create_arg_item(struct event_format *event, const char *token,
- enum event_type type, struct filter_arg **parg, char **error_str)
+ enum event_type type, struct filter_arg **parg, char *error_str)
{
struct format_field *field;
struct filter_arg *arg;
@@ -474,7 +450,7 @@ create_arg_cmp(enum filter_exp_type etype)
}
static enum pevent_errno
-add_right(struct filter_arg *op, struct filter_arg *arg, char **error_str)
+add_right(struct filter_arg *op, struct filter_arg *arg, char *error_str)
{
struct filter_arg *left;
char *str;
@@ -786,7 +762,7 @@ enum filter_vals {
static enum pevent_errno
reparent_op_arg(struct filter_arg *parent, struct filter_arg *old_child,
- struct filter_arg *arg, char **error_str)
+ struct filter_arg *arg, char *error_str)
{
struct filter_arg *other_child;
struct filter_arg **ptr;
@@ -838,7 +814,7 @@ reparent_op_arg(struct filter_arg *parent, struct filter_arg *old_child,
/* Returns either filter_vals (success) or pevent_errno (failfure) */
static int test_arg(struct filter_arg *parent, struct filter_arg *arg,
- char **error_str)
+ char *error_str)
{
int lval, rval;
@@ -938,7 +914,7 @@ static int test_arg(struct filter_arg *parent, struct filter_arg *arg,
/* Remove any unknown event fields */
static int collapse_tree(struct filter_arg *arg,
- struct filter_arg **arg_collapsed, char **error_str)
+ struct filter_arg **arg_collapsed, char *error_str)
{
int ret;
@@ -973,7 +949,7 @@ static int collapse_tree(struct filter_arg *arg,
static enum pevent_errno
process_filter(struct event_format *event, struct filter_arg **parg,
- char **error_str, int not)
+ char *error_str, int not)
{
enum event_type type;
char *token = NULL;
@@ -1211,7 +1187,7 @@ process_filter(struct event_format *event, struct filter_arg **parg,
static enum pevent_errno
process_event(struct event_format *event, const char *filter_str,
- struct filter_arg **parg, char **error_str)
+ struct filter_arg **parg, char *error_str)
{
int ret;
@@ -1236,7 +1212,7 @@ process_event(struct event_format *event, const char *filter_str,
static enum pevent_errno
filter_event(struct event_filter *filter, struct event_format *event,
- const char *filter_str, char **error_str)
+ const char *filter_str, char *error_str)
{
struct filter_type *filter_type;
struct filter_arg *arg;
@@ -1268,13 +1244,21 @@ filter_event(struct event_filter *filter, struct event_format *event,
return 0;
}
+static void filter_init_error_buf(struct event_filter *filter)
+{
+ /* clear buffer to reset show error */
+ pevent_buffer_init("", 0);
+ filter->error_buffer[0] = '\0';
+}
+
/**
* pevent_filter_add_filter_str - add a new filter
* @filter: the event filter to add to
* @filter_str: the filter string that contains the filter
*
* Returns 0 if the filter was successfully added or a
- * negative error code.
+ * negative error code. Use pevent_filter_strerror() to see
+ * actual error message in case of error.
*/
enum pevent_errno pevent_filter_add_filter_str(struct event_filter *filter,
const char *filter_str)
@@ -1291,10 +1275,8 @@ enum pevent_errno pevent_filter_add_filter_str(struct event_filter *filter,
enum pevent_errno rtn = 0; /* PEVENT_ERRNO__SUCCESS */
int len;
int ret;
- char *error_str = NULL;
- /* clear buffer to reset show error */
- pevent_buffer_init("", 0);
+ filter_init_error_buf(filter);
filter_start = strchr(filter_str, ':');
if (filter_start)
@@ -1353,7 +1335,7 @@ enum pevent_errno pevent_filter_add_filter_str(struct event_filter *filter,
/* filter starts here */
for (event = events; event; event = event->next) {
ret = filter_event(filter, event->event, filter_start,
- &error_str);
+ filter->error_buffer);
/* Failures are returned if a parse error happened */
if (ret < 0)
rtn = ret;
@@ -1382,6 +1364,32 @@ static void free_filter_type(struct filter_type *filter_type)
}
/**
+ * pevent_filter_strerror - fill error message in a buffer
+ * @filter: the event filter contains error
+ * @err: the error code
+ * @buf: the buffer to be filled in
+ * @buflen: the size of the buffer
+ *
+ * Returns 0 if message was filled successfully, -1 if error
+ */
+int pevent_filter_strerror(struct event_filter *filter, enum pevent_errno err,
+ char *buf, size_t buflen)
+{
+ if (err <= __PEVENT_ERRNO__START || err >= __PEVENT_ERRNO__END)
+ return -1;
+
+ if (strlen(filter->error_buffer) > 0) {
+ size_t len = snprintf(buf, buflen, "%s", filter->error_buffer);
+
+ if (len > buflen)
+ return -1;
+ return 0;
+ }
+
+ return pevent_strerror(filter->pevent, err, buf, buflen);
+}
+
+/**
* pevent_filter_remove_event - remove a filter for an event
* @filter: the event filter to remove from
* @event_id: the event to remove a filter for
@@ -2027,6 +2035,8 @@ enum pevent_errno pevent_filter_match(struct event_filter *filter,
int ret;
enum pevent_errno err = 0;
+ filter_init_error_buf(filter);
+
if (!filter->filters)
return PEVENT_ERRNO__NO_FILTER;
--
1.7.11.7
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists