1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <unistd.h>
5 #include <errno.h>
6
7 #include <cutils/iosched_policy.h>
8
9 static char *classes[] = {"none", "rt", "be", "idle", NULL};
10
ionice_main(int argc,char * argv[])11 int ionice_main(int argc, char *argv[])
12 {
13 IoSchedClass clazz = IoSchedClass_NONE;
14 int ioprio = 0;
15 int pid;
16
17 if(argc != 2 && argc != 4) {
18 fprintf(stderr, "usage: ionice <pid> [none|rt|be|idle] [prio]\n");
19 return 1;
20 }
21
22 if (!(pid = atoi(argv[1]))) {
23 fprintf(stderr, "Invalid pid specified\n");
24 return 1;
25 }
26
27 if (argc == 2) {
28 if (android_get_ioprio(pid, &clazz, &ioprio)) {
29 fprintf(stderr, "Failed to read priority (%s)\n", strerror(errno));
30 return 1;
31 }
32 fprintf(stdout, "Pid %d, class %s (%d), prio %d\n", pid, classes[clazz], clazz, ioprio);
33 return 0;
34 }
35
36 if (!strcmp(argv[2], "none")) {
37 clazz = IoSchedClass_NONE;
38 } else if (!strcmp(argv[2], "rt")) {
39 clazz = IoSchedClass_RT;
40 } else if (!strcmp(argv[2], "be")) {
41 clazz = IoSchedClass_BE;
42 } else if (!strcmp(argv[2], "idle")) {
43 clazz = IoSchedClass_IDLE;
44 } else {
45 fprintf(stderr, "Unsupported class '%s'\n", argv[2]);
46 return 1;
47 }
48
49 ioprio = atoi(argv[3]);
50
51 printf("Setting pid %d i/o class to %d, prio %d\n", pid, clazz, ioprio);
52 if (android_set_ioprio(pid, clazz, ioprio)) {
53 fprintf(stderr, "Failed to set priority (%s)\n", strerror(errno));
54 return 1;
55 }
56
57 return 0;
58 }
59