1 /*
2 * Copyright (c) 2008, The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google, Inc. nor the names of its contributors
15 * may be used to endorse or promote products derived from this
16 * software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
25 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <stdio.h>
33 #include <unistd.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <sys/time.h>
37 #include <sys/resource.h>
38 #include <sched.h>
39 #include <getopt.h>
40
41 static void
usage(const char * s)42 usage(const char *s)
43 {
44 fprintf(stderr, "USAGE: %s [[-r] [-t TYPE] priority pids ...] [-g pid]\n", s);
45 exit(EXIT_FAILURE);
46 }
47
print_prio(pid_t pid)48 void print_prio(pid_t pid)
49 {
50 int sched;
51 struct sched_param sp;
52
53 printf("pid %d's priority: %d\n", pid, getpriority(PRIO_PROCESS, pid));
54
55 printf("scheduling class: ");
56 sched = sched_getscheduler(pid);
57 switch (sched) {
58 case SCHED_FIFO:
59 printf("FIFO\n");
60 break;
61 case SCHED_RR:
62 printf("RR\n");
63 break;
64 case SCHED_OTHER:
65 printf("Normal\n");
66 break;
67 case -1:
68 perror("sched_getscheduler");
69 break;
70 default:
71 printf("Unknown\n");
72 }
73
74 sched_getparam(pid, &sp);
75 printf("RT prio: %d (of %d to %d)\n", sp.sched_priority,
76 sched_get_priority_min(sched), sched_get_priority_max(sched));
77 }
78
get_sched(char * str)79 int get_sched(char *str)
80 {
81 if (strcasecmp(str, "RR") == 0)
82 return SCHED_RR;
83 else if (strcasecmp(str, "FIFO") == 0)
84 return SCHED_FIFO;
85 else if (strcasecmp(str, "NORMAL") == 0)
86 return SCHED_OTHER;
87 else if (strcasecmp(str, "OTHER") == 0)
88 return SCHED_OTHER;
89 return SCHED_RR;
90 }
91
renice_main(int argc,char * argv[])92 int renice_main(int argc, char *argv[])
93 {
94 int prio;
95 int realtime = 0;
96 int opt;
97 int sched = SCHED_RR;
98 char *cmd = argv[0];
99
100 do {
101 opt = getopt(argc, argv, "rt:g:");
102 if (opt == -1)
103 break;
104 switch (opt) {
105 case 'r':
106 // do realtime priority adjustment
107 realtime = 1;
108 break;
109 case 't':
110 sched = get_sched(optarg);
111 break;
112 case 'g':
113 print_prio(atoi(optarg));
114 return 0;
115 default:
116 usage(cmd);
117 }
118 } while (1);
119
120 argc -= optind;
121 argv += optind;
122
123 if (argc < 1)
124 usage(cmd);
125
126 prio = atoi(argv[0]);
127 argc--;
128 argv++;
129
130 if (argc < 1)
131 usage(cmd);
132
133 while(argc) {
134 pid_t pid;
135
136 pid = atoi(argv[0]);
137 argc--;
138 argv++;
139
140 if (realtime) {
141 struct sched_param sp = { .sched_priority = prio };
142 int ret;
143
144 ret = sched_setscheduler(pid, sched, &sp);
145 if (ret) {
146 perror("sched_set_scheduler");
147 exit(EXIT_FAILURE);
148 }
149 } else {
150 int ret;
151
152 ret = setpriority(PRIO_PROCESS, pid, prio);
153 if (ret) {
154 perror("setpriority");
155 exit(EXIT_FAILURE);
156 }
157 }
158 }
159
160 return 0;
161 }
162