static int parse_events_add_kprobe(char *event)
{
char *symbol, *end;
struct probe_cb_base base;
int fd, ret;
fd = open(KPROBE_EVENTS_PATH, O_WRONLY);
if (fd < 0) {
fprintf(stderr, "Cannot open %s\n", KPROBE_EVENTS_PATH);
return -1;
}
end = strpbrk(event, "% ");
if (end)
symbol = strndup(event, end - event);
else
symbol = strdup(event);
base.fd = fd;
base.ret_probe = !!strstr(event, "%return");
base.symbol = symbol;
base.fetch_args = strchr(event, ' ');
init_kprobe_prohibited_area();
ret = kallsyms_parse(&base, kprobe_symbol_actor);
if (ret < 0)
fprintf(stderr, "cannot parse symbol \"%s\"\n", symbol);
free(symbol);
close(fd);
return ret;
}
unsigned long find_kernel_symbol(const char *symbol)
{
int ret;
struct ksym_addr_t arg = {
.name = symbol,
.addr = 0
};
ret = kallsyms_parse(&arg, symbol_cmp);
if (ret < 0 || arg.addr == 0) {
fprintf(stderr, "cannot read kernel symbol \"%s\" in %s\n",
symbol, KALLSYMS_PATH);
exit(EXIT_FAILURE);
}
return arg.addr;
}
unsigned long find_kernel_symbol(const char *symbol)
{
int ret;
struct ksym_addr_t arg = {
.name = symbol,
.addr = 0
};
ret = kallsyms_parse(&arg, symbol_cmp);
if (ret < 0 || arg.addr == 0) {
fprintf(stderr, "cannot read kernel symbol \"%s\" in %s\n",
symbol, KALLSYMS_PATH);
exit(EXIT_FAILURE);
}
return arg.addr;
}
#define AVAILABLE_EVENTS_PATH "/sys/kernel/debug/tracing/available_events"
void list_available_events(const char *match)
{
FILE *file;
char *line = NULL;
file = fopen(AVAILABLE_EVENTS_PATH, "r");
if (file == NULL)
handle_error("open " AVAILABLE_EVENTS_PATH " failed");
while (!feof(file)) {
int line_len;
size_t n;
line_len = getline(&line, &n, file);
if (line_len < 0 || !line)
break;
if (!match || strglobmatch(line, match))
printf("%s", line);
}
free(line);
fclose(file);
}