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 <sys/time.h>
36 #include <sys/resource.h>
37 #include <sched.h>
38 #include <getopt.h>
39
40 static void
usage(const char * s)41 usage(const char *s)
42 {
43 fprintf(stderr, "USAGE: %s [[-r] [-t TYPE] priority pids ...] [-g pid]\n", s);
44 exit(EXIT_FAILURE);
45 }
46
print_prio(pid_t pid)47 void print_prio(pid_t pid)
48 {
49 int sched;
50 struct sched_param sp;
51
52 printf("pid %d's priority: %d\n", pid, getpriority(PRIO_PROCESS, pid));
53
54 printf("scheduling class: ");
55 sched = sched_getscheduler(pid);
56 switch (sched) {
57 case SCHED_FIFO:
58 printf("FIFO\n");
59 break;
60 case SCHED_RR:
61 printf("RR\n");
62 break;
63 case SCHED_OTHER:
64 printf("Normal\n");
65 break;
66 case -1:
67 perror("sched_getscheduler");
68 break;
69 default:
70 printf("Unknown\n");
71 }
72
73 sched_getparam(pid, &sp);
74 printf("RT prio: %d (of %d to %d)\n", sp.sched_priority,
75 sched_get_priority_min(sched), sched_get_priority_max(sched));
76 }
77
get_sched(char * str)78 int get_sched(char *str)
79 {
80 if (strcasecmp(str, "RR") == 0)
81 return SCHED_RR;
82 else if (strcasecmp(str, "FIFO") == 0)
83 return SCHED_FIFO;
84 else if (strcasecmp(str, "NORMAL") == 0)
85 return SCHED_OTHER;
86 else if (strcasecmp(str, "OTHER") == 0)
87 return SCHED_OTHER;
88 return SCHED_RR;
89 }
90
renice_main(int argc,char * argv[])91 int renice_main(int argc, char *argv[])
92 {
93 int prio;
94 int realtime = 0;
95 int opt;
96 int sched = SCHED_RR;
97 char *cmd = argv[0];
98
99 do {
100 opt = getopt(argc, argv, "rt:g:");
101 if (opt == -1)
102 break;
103 switch (opt) {
104 case 'r':
105 // do realtime priority adjustment
106 realtime = 1;
107 break;
108 case 't':
109 sched = get_sched(optarg);
110 break;
111 case 'g':
112 print_prio(atoi(optarg));
113 return 0;
114 default:
115 usage(cmd);
116 }
117 } while (1);
118
119 argc -= optind;
120 argv += optind;
121
122 if (argc < 1)
123 usage(cmd);
124
125 prio = atoi(argv[0]);
126 argc--;
127 argv++;
128
129 if (argc < 1)
130 usage(cmd);
131
132 while(argc) {
133 pid_t pid;
134
135 pid = atoi(argv[0]);
136 argc--;
137 argv++;
138
139 if (realtime) {
140 struct sched_param sp = { .sched_priority = prio };
141 int ret;
142
143 ret = sched_setscheduler(pid, sched, &sp);
144 if (ret) {
145 perror("sched_set_scheduler");
146 exit(EXIT_FAILURE);
147 }
148 } else {
149 int ret;
150
151 ret = setpriority(PRIO_PROCESS, pid, prio);
152 if (ret) {
153 perror("setpriority");
154 exit(EXIT_FAILURE);
155 }
156 }
157 }
158
159 return 0;
160 }
161