--- netbsd.c.old	2009-11-22 14:20:52.000000000 +0100
+++ netbsd.c	2009-11-22 14:37:08.000000000 +0100
@@ -14,6 +14,7 @@
 #include <kvm.h>
 #include <nlist.h>
 
+#include <sys/ioctl.h>
 #include <sys/time.h>
 #include <sys/param.h>
 #include <sys/sysctl.h>
@@ -345,7 +346,44 @@
 
 double get_acpi_temperature(int fd) {
     (void) fd;
-    return -1;
+	envsys_basic_info_t info; /* sensor misc. info */
+	struct envsys_tre_data sen_data;
+	double temp;
+
+	/* iterate through available sensors, until the first invalid */
+	for (info.sensor=0; ; info.sensor++) {
+
+		/* stop if we can't ioctl() */
+		if (ioctl(fd, ENVSYS_GTREINFO, &info) < 0)
+			break;
+		/* stop if that sensor is not valid */
+		if (!(info.validflags & ENVSYS_FVALID))
+			break;
+		
+		if (info.units ==  ENVSYS_STEMP)
+			break;
+	}
+
+	/* get data from sensor */
+	sen_data.sensor=info.sensor;
+
+	if (ioctl(fd, ENVSYS_GTREDATA, &sen_data) == -1) {
+		(void)warn("Can't get sensor data for sensor acpitz");
+
+		return -1;
+	}
+	
+	/* test validity of returned data */
+	if (!(sen_data.validflags & (ENVSYS_FVALID|ENVSYS_FCURVALID))) {
+		(void)warn("Invalid datas received");
+		
+		return -1;
+	}
+
+	/*count temperature*/
+	temp = ((sen_data.cur.data_us / 1000000.0)-273.15);
+	
+	return temp;
 }
 
 int open_i2c_sensor(const char *dev, const char *type, int n, int *div)
@@ -356,7 +394,16 @@
 
 int open_acpi_temperature(const char *name) {
     (void) name;
-    return -1;
+	int fd;
+
+	/* Open /dev/sysmon device to connect with envsys API */
+	if (name == NULL)
+		name = _PATH_SYSMON;
+
+	if ((fd = open(name, O_RDONLY)) == -1)
+		(void)warnx("cannot open %s", name);
+
+	return fd;
 }
 
 static char acpi_ac_str[64] = "N/A";