static int write_event_exclusions(struct mi_writer *writer,
struct lttng_event *event)
{
int i;
int ret;
int exclusion_count;
/* Open event exclusions */
ret = mi_lttng_writer_open_element(writer, config_element_exclusions);
if (ret) {
goto end;
}
exclusion_count = lttng_event_get_exclusion_name_count(event);
if (exclusion_count < 0) {
ret = exclusion_count;
goto end;
}
for (i = 0; i < exclusion_count; i++) {
const char *name;
ret = lttng_event_get_exclusion_name(event, i, &name);
if (ret) {
/* Close exclusions */
mi_lttng_writer_close_element(writer);
goto end;
}
ret = mi_lttng_writer_write_element_string(writer,
config_element_exclusion, name);
if (ret) {
/* Close exclusions */
mi_lttng_writer_close_element(writer);
goto end;
}
}
/* Close exclusions */
ret = mi_lttng_writer_close_element(writer);
end:
return ret;
}
/*
* Get exclusion names message for a single event.
*
* Returned pointer must be freed by caller. Returns NULL on error.
*/
static char *get_exclusion_names_msg(struct lttng_event *event)
{
int ret;
int exclusion_count;
char *exclusion_msg = NULL;
char *at;
size_t i;
const char * const exclusion_fmt = " [exclusions: ";
const size_t exclusion_fmt_len = strlen(exclusion_fmt);
exclusion_count = lttng_event_get_exclusion_name_count(event);
if (exclusion_count < 0) {
goto end;
} else if (exclusion_count == 0) {
/*
* No exclusions: return copy of empty string so that
* it can be freed by caller.
*/
exclusion_msg = strdup("");
goto end;
}
/*
* exclusion_msg's size is bounded by the exclusion_fmt string,
* a comma per entry, the entry count (fixed-size), a closing
* bracket, and a trailing \0.
*/
exclusion_msg = malloc(exclusion_count +
exclusion_count * LTTNG_SYMBOL_NAME_LEN +
exclusion_fmt_len + 1);
if (!exclusion_msg) {
goto end;
}
at = strcpy(exclusion_msg, exclusion_fmt) + exclusion_fmt_len;
for (i = 0; i < exclusion_count; ++i) {
const char *name;
/* Append comma between exclusion names */
if (i > 0) {
*at = ',';
at++;
}
ret = lttng_event_get_exclusion_name(event, i, &name);
if (ret) {
/* Prints '?' on local error; should never happen */
*at = '?';
at++;
continue;
}
/* Append exclusion name */
at += sprintf(at, "%s", name);
}
/* This also puts a final '\0' at the end of exclusion_msg */
strcpy(at, "]");
end:
return exclusion_msg;
}
