1 /*
2 * dslm.c
3 * Simple Disk Sleep Monitor
4 * by Bartek Kania
5 * Licensed under the GPL
6 */
7 #include <unistd.h>
8 #include <stdlib.h>
9 #include <stdio.h>
10 #include <fcntl.h>
11 #include <errno.h>
12 #include <time.h>
13 #include <string.h>
14 #include <signal.h>
15 #include <sys/ioctl.h>
16 #include <linux/hdreg.h>
17
18 #ifdef DEBUG
19 #define D(x) x
20 #else
21 #define D(x)
22 #endif
23
24 int endit = 0;
25
26 /* Check if the disk is in powersave-mode
27 * Most of the code is stolen from hdparm.
28 * 1 = active, 0 = standby/sleep, -1 = unknown */
29 static int check_powermode(int fd)
30 {
31 unsigned char args[4] = {WIN_CHECKPOWERMODE1,0,0,0};
32 int state;
33
34 if (ioctl(fd, HDIO_DRIVE_CMD, &args)
35 && (args[0] = WIN_CHECKPOWERMODE2) /* try again with 0x98 */
36 && ioctl(fd, HDIO_DRIVE_CMD, &args)) {
37 if (errno != EIO || args[0] != 0 || args[1] != 0) {
38 state = -1; /* "unknown"; */
39 } else
40 state = 0; /* "sleeping"; */
41 } else {
42 state = (args[2] == 255) ? 1 : 0;
43 }
44 D(printf(" drive state is: %d\n", state));
45
46 return state;
47 }
48
49 static char *state_name(int i)
50 {
51 if (i == -1) return "unknown";
52 if (i == 0) return "sleeping";
53 if (i == 1) return "active";
54
55 return "internal error";
56 }
57
58 static char *myctime(time_t time)
59 {
60 char *ts = ctime(&time);
61 ts[strlen(ts) - 1] = 0;
62
63 return ts;
64 }
65
66 static void measure(int fd)
67 {
68 time_t start_time;
69 int last_state;
70 time_t last_time;
71 int curr_state;
72 time_t curr_time = 0;
73 time_t time_diff;
74 time_t active_time = 0;
75 time_t sleep_time = 0;
76 time_t unknown_time = 0;
77 time_t total_time = 0;
78 int changes = 0;
79 float tmp;
80
81 printf("Starting measurements\n");
82
83 last_state = check_powermode(fd);
84 start_time = last_time = time(0);
85 printf(" System is in state %s\n\n", state_name(last_state));
86
87 while(!endit) {
88 sleep(1);
89 curr_state = check_powermode(fd);
90
91 if (curr_state != last_state || endit) {
92 changes++;
93 curr_time = time(0);
94 time_diff = curr_time - last_time;
95
96 if (last_state == 1) active_time += time_diff;
97 else if (last_state == 0) sleep_time += time_diff;
98 else unknown_time += time_diff;
99
100 last_state = curr_state;
101 last_time = curr_time;
102
103 printf("%s: State-change to %s\n", myctime(curr_time),
104 state_name(curr_state));
105 }
106 }
107 changes--; /* Compensate for SIGINT */
108
109 total_time = time(0) - start_time;
110 printf("\nTotal running time: %lus\n", curr_time - start_time);
111 printf(" State changed %d times\n", changes);
112
113 tmp = (float)sleep_time / (float)total_time * 100;
114 printf(" Time in sleep state: %lus (%.2f%%)\n", sleep_time, tmp);
115 tmp = (float)active_time / (float)total_time * 100;
116 printf(" Time in active state: %lus (%.2f%%)\n", active_time, tmp);
117 tmp = (float)unknown_time / (float)total_time * 100;
118 printf(" Time in unknown state: %lus (%.2f%%)\n", unknown_time, tmp);
119 }
120
121 static void ender(int s)
122 {
123 endit = 1;
124 }
125
126 static void usage(void)
127 {
128 puts("usage: dslm [-w <time>] <disk>");
129 exit(0);
130 }
131
132 int main(int argc, char **argv)
133 {
134 int fd;
135 char *disk = 0;
136 int settle_time = 60;
137
138 /* Parse the simple command-line */
139 if (argc == 2)
140 disk = argv[1];
141 else if (argc == 4) {
142 settle_time = atoi(argv[2]);
143 disk = argv[3];
144 } else
145 usage();
146
147 if (!(fd = open(disk, O_RDONLY|O_NONBLOCK))) {
148 printf("Can't open %s, because: %s\n", disk, strerror(errno));
149 exit(-1);
150 }
151
152 if (settle_time) {
153 printf("Waiting %d seconds for the system to settle down to "
154 "'normal'\n", settle_time);
155 sleep(settle_time);
156 } else
157 puts("Not waiting for system to settle down");
158
159 signal(SIGINT, ender);
160
161 measure(fd);
162
163 close(fd);
164
165 return 0;
166 }
167
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