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// SPDX-License-Identifier: LGPL-2.1
/*
* Copyright (C) 2008, 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
*
* Updates:
* Copyright (C) 2020, VMware, Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
*
*/
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include "tracefs.h"
#include "trace-local.h"
struct instances_list {
struct instances_list *next;
struct tracefs_instance *instance;
};
static int add_new_instance(struct instances_list **list, char *name)
{
struct instances_list *new;
if (!tracefs_instance_exists(name))
return -1;
new = calloc(1, sizeof(*new));
if (!new)
return -1;
new->instance = tracefs_instance_create(name);
if (!new->instance) {
free(new);
return -1;
}
new->next = *list;
*list = new;
return 0;
}
static int add_instance_walk(const char *name, void *data)
{
return add_new_instance((struct instances_list **)data, (char *)name);
}
static void clear_list(struct instances_list *list)
{
struct instances_list *del;
while (list) {
del = list;
list = list->next;
tracefs_instance_free(del->instance);
free(del);
}
}
static void clear_instance_trace(struct tracefs_instance *instance)
{
FILE *fp;
char *path;
/* reset the trace */
path = tracefs_instance_get_file(instance, "trace");
fp = fopen(path, "w");
if (!fp)
die("writing to '%s'", path);
tracefs_put_tracing_file(path);
fwrite("0", 1, 1, fp);
fclose(fp);
}
static void clear_trace(struct instances_list *instances)
{
if (instances) {
while (instances) {
clear_instance_trace(instances->instance);
instances = instances->next;
}
} else
clear_instance_trace(NULL);
}
void trace_clear(int argc, char **argv)
{
struct instances_list *instances = NULL;
bool all = false;
int c;
for (;;) {
int option_index = 0;
static struct option long_options[] = {
{"all", no_argument, NULL, 'a'},
{"help", no_argument, NULL, '?'},
{NULL, 0, NULL, 0}
};
c = getopt_long (argc-1, argv+1, "+haB:",
long_options, &option_index);
if (c == -1)
break;
switch (c) {
case 'B':
if (add_new_instance(&instances, optarg))
die("Failed to allocate instance %s", optarg);
break;
case 'a':
all = true;
if (tracefs_instances_walk(add_instance_walk, &instances))
die("Failed to add all instances");
break;
case 'h':
case '?':
default:
usage(argv);
break;
}
}
clear_trace(instances);
if (all)
clear_trace(NULL);
clear_list(instances);
exit(0);
}
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