167 lines
3.6 KiB
C
167 lines
3.6 KiB
C
/*
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* dslm.c
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* Simple Disk Sleep Monitor
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* by Bartek Kania
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* Licensed under the GPL
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <time.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <linux/hdreg.h>
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#ifdef DEBUG
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#define D(x) x
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#else
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#define D(x)
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#endif
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int endit = 0;
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/* Check if the disk is in powersave-mode
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* Most of the code is stolen from hdparm.
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* 1 = active, 0 = standby/sleep, -1 = unknown */
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static int check_powermode(int fd)
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{
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unsigned char args[4] = {WIN_CHECKPOWERMODE1,0,0,0};
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int state;
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if (ioctl(fd, HDIO_DRIVE_CMD, &args)
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&& (args[0] = WIN_CHECKPOWERMODE2) /* try again with 0x98 */
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&& ioctl(fd, HDIO_DRIVE_CMD, &args)) {
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if (errno != EIO || args[0] != 0 || args[1] != 0) {
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state = -1; /* "unknown"; */
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} else
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state = 0; /* "sleeping"; */
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} else {
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state = (args[2] == 255) ? 1 : 0;
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}
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D(printf(" drive state is: %d\n", state));
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return state;
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}
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static char *state_name(int i)
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{
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if (i == -1) return "unknown";
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if (i == 0) return "sleeping";
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if (i == 1) return "active";
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return "internal error";
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}
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static char *myctime(time_t time)
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{
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char *ts = ctime(&time);
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ts[strlen(ts) - 1] = 0;
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return ts;
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}
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static void measure(int fd)
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{
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time_t start_time;
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int last_state;
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time_t last_time;
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int curr_state;
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time_t curr_time = 0;
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time_t time_diff;
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time_t active_time = 0;
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time_t sleep_time = 0;
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time_t unknown_time = 0;
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time_t total_time = 0;
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int changes = 0;
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float tmp;
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printf("Starting measurements\n");
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last_state = check_powermode(fd);
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start_time = last_time = time(0);
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printf(" System is in state %s\n\n", state_name(last_state));
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while(!endit) {
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sleep(1);
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curr_state = check_powermode(fd);
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if (curr_state != last_state || endit) {
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changes++;
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curr_time = time(0);
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time_diff = curr_time - last_time;
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if (last_state == 1) active_time += time_diff;
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else if (last_state == 0) sleep_time += time_diff;
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else unknown_time += time_diff;
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last_state = curr_state;
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last_time = curr_time;
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printf("%s: State-change to %s\n", myctime(curr_time),
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state_name(curr_state));
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}
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}
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changes--; /* Compensate for SIGINT */
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total_time = time(0) - start_time;
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printf("\nTotal running time: %lus\n", curr_time - start_time);
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printf(" State changed %d times\n", changes);
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tmp = (float)sleep_time / (float)total_time * 100;
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printf(" Time in sleep state: %lus (%.2f%%)\n", sleep_time, tmp);
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tmp = (float)active_time / (float)total_time * 100;
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printf(" Time in active state: %lus (%.2f%%)\n", active_time, tmp);
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tmp = (float)unknown_time / (float)total_time * 100;
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printf(" Time in unknown state: %lus (%.2f%%)\n", unknown_time, tmp);
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}
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static void ender(int s)
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{
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endit = 1;
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}
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static void usage(void)
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{
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puts("usage: dslm [-w <time>] <disk>");
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exit(0);
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}
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int main(int argc, char **argv)
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{
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int fd;
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char *disk = 0;
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int settle_time = 60;
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/* Parse the simple command-line */
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if (argc == 2)
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disk = argv[1];
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else if (argc == 4) {
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settle_time = atoi(argv[2]);
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disk = argv[3];
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} else
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usage();
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if (!(fd = open(disk, O_RDONLY|O_NONBLOCK))) {
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printf("Can't open %s, because: %s\n", disk, strerror(errno));
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exit(-1);
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}
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if (settle_time) {
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printf("Waiting %d seconds for the system to settle down to "
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"'normal'\n", settle_time);
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sleep(settle_time);
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} else
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puts("Not waiting for system to settle down");
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signal(SIGINT, ender);
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measure(fd);
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close(fd);
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return 0;
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}
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