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(i: 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(time: curr_time), |
104 | state_name(i: 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 | |