libbpf-tools: Add verbose option to mountsnoop
Support verbose mode and set custom libbpf print callback
in mountsnoop.
@@ -38,6 +38,7 @@ static volatile sig_atomic_t exiting = 0;
static pid_t target_pid = 0;
static bool emit_timestamp = false;
static bool output_vertically = false;
+static bool verbose = false;
static const char *flag_names[] = {
[0] = "MS_RDONLY",
[1] = "MS_NOSUID",
@@ -91,6 +92,7 @@ static const struct argp_option opts[] = {
{ "pid", 'p', "PID", 0, "Process ID to trace" },
{ "timestamp", 't', NULL, 0, "Include timestamp on output" },
{ "detailed", 'd', NULL, 0, "Output result in detail mode" },
+ { "verbose", 'v', NULL, 0, "Verbose debug output" },
{ NULL, 'h', NULL, OPTION_HIDDEN, "Show the full help" },
{},
};
@@ -115,6 +117,9 @@ static error_t parse_arg(int key, char *arg, struct argp_state *state)
case 'd':
output_vertically = true;
break;
+ case 'v':
+ verbose = true;
+ break;
case 'h':
argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
break;
@@ -124,6 +129,13 @@ 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;
@@ -246,6 +258,7 @@ int main(int argc, char **argv)
return err;
libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
+ libbpf_set_print(libbpf_print_fn);
obj = mountsnoop_bpf__open();
if (!obj) {
