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