#include "opt_kdb.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kdb.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>

SYSCTL_NODE(_debug, OID_AUTO, trace_errors, CTLFLAG_RW, 0,
	"TRACE_ERRORS config");
static int error2trace = 0;
SYSCTL_UINT(_debug_trace_errors, OID_AUTO, error_to_trace, CTLFLAG_RW,
        &error2trace, 0, "Error value to trace (see errno.h)");
static int error2trace_once = 0;
SYSCTL_UINT(_debug_trace_errors, OID_AUTO, error_to_trace_once, CTLFLAG_RW,
        &error2trace_once, 0, "Error value to trace once (see errno.h)");
static int syslog = 1;
SYSCTL_UINT(_debug_trace_errors, OID_AUTO, syslog, CTLFLAG_RW,
        &syslog, 0, "Log traced error via log(9)");
#ifdef KDB
static int backtrace = 0;
SYSCTL_UINT(_debug_trace_errors, OID_AUTO, backtrace, CTLFLAG_RW,
        &backtrace, 0, "Print backtrace upon error");
#endif

int
__kern_trace_error(const int error, const char *file, const int line)
{

	if (error != error2trace && error != error2trace_once)
		return (error);

	if (error == error2trace_once)
		error2trace_once = 0;

	if (syslog)
		log(LOG_DEBUG, "Error %d at %s:%u\n", error, file, line);
#ifdef KDB
	if (backtrace)
		kdb_backtrace();
#endif

	return (error);
}