libbpf-tools: Add verbose option to exitsnoop
Support verbose mode and set custom libbpf print callback
in exitsnoop.
@@ -30,6 +30,7 @@ static bool emit_timestamp = false;
static pid_t target_pid = 0;
static bool trace_failed_only = false;
static bool trace_by_process = true;
+static bool verbose = false;
const char *argp_program_version = "exitsnoop 0.1";
const char *argp_program_bug_address =
@@ -51,6 +52,7 @@ static const struct argp_option opts[] = {
{ "failed", 'x', NULL, 0, "Trace error exits only." },
{ "pid", 'p', "PID", 0, "Process ID to trace" },
{ "threaded", 'T', NULL, 0, "Trace by thread." },
+ { "verbose", 'v', NULL, 0, "Verbose debug output" },
{ NULL, 'h', NULL, OPTION_HIDDEN, "Show the full help" },
{},
};
@@ -78,6 +80,9 @@ static error_t parse_arg(int key, char *arg, struct argp_state *state)
case 'T':
trace_by_process = false;
break;
+ case 'v':
+ verbose = true;
+ break;
case 'h':
argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
break;
@@ -87,6 +92,13 @@ static error_t parse_arg(int key, char *arg, struct argp_state *state)
return 0;
}
+static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)
+{
+ if (level == LIBBPF_DEBUG && !verbose)
+ return 0;
+ return vfprintf(stderr, format, args);
+}
+
static void sig_int(int signo)
{
exiting = 1;
@@ -149,6 +161,7 @@ int main(int argc, char **argv)
return err;
libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+ libbpf_set_print(libbpf_print_fn);
obj = exitsnoop_bpf__open();
if (!obj) {
