1/*
2 * Copyright (c) 1994 David Greenman
3 * Copyright (c) 1994 Henrik Vestergaard Draboel (hvd@terry.ping.dk)
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *	This product includes software developed by Henrik Vestergaard Draboel.
17 *	This product includes software developed by David Greenman.
18 * 4. Neither the names of the authors nor the names of contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
38#include <sys/param.h>
39#include <sys/rtprio.h>
40
41#include <ctype.h>
42#include <err.h>
43#include <errno.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48
49static int parseint(const char *, const char *);
50static void usage(void);
51
52int
53main(int argc, char *argv[])
54{
55	struct rtprio rtp;
56	const char *progname;
57	pid_t proc = 0;
58
59	progname = getprogname();
60
61	if (strcmp(progname, "rtprio") == 0)
62		rtp.type = RTP_PRIO_REALTIME;
63	else if (strcmp(progname, "idprio") == 0)
64		rtp.type = RTP_PRIO_IDLE;
65	else
66		errx(1, "invalid progname");
67
68	switch (argc) {
69	case 2:
70		proc = parseint(argv[1], "pid");
71		proc = abs(proc);
72		/* FALLTHROUGH */
73	case 1:
74		if (rtprio(RTP_LOOKUP, proc, &rtp) != 0)
75			err(1, "RTP_LOOKUP");
76		switch (rtp.type) {
77		case RTP_PRIO_REALTIME:
78		case RTP_PRIO_FIFO:
79			warnx("realtime priority %d", rtp.prio);
80			break;
81		case RTP_PRIO_NORMAL:
82			warnx("normal priority");
83			break;
84		case RTP_PRIO_IDLE:
85			warnx("idle priority %d", rtp.prio);
86			break;
87		default:
88			errx(1, "invalid priority type %d", rtp.type);
89			break;
90		}
91		exit(0);
92	default:
93		if (argv[1][0] == '-' || isdigit(argv[1][0])) {
94			if (argv[1][0] == '-') {
95				if (strcmp(argv[1], "-t") == 0) {
96					rtp.type = RTP_PRIO_NORMAL;
97					rtp.prio = 0;
98				} else {
99					usage();
100					break;
101				}
102			} else
103				rtp.prio = parseint(argv[1], "priority");
104		} else {
105			usage();
106			break;
107		}
108
109		if (argv[2][0] == '-') {
110			proc = parseint(argv[2], "pid");
111			proc = abs(proc);
112		}
113
114		if (rtprio(RTP_SET, proc, &rtp) != 0)
115			err(1, "RTP_SET");
116
117		if (proc == 0) {
118			execvp(argv[2], &argv[2]);
119			err(1, "execvp: %s", argv[2]);
120		}
121		exit(0);
122	}
123	/* NOTREACHED */
124}
125
126static int
127parseint(const char *str, const char *errname)
128{
129	char *endp;
130	long res;
131
132	errno = 0;
133	res = strtol(str, &endp, 10);
134	if (errno != 0 || endp == str || *endp != '\0')
135		errx(1, "%s must be a number", errname);
136	if (res >= INT_MAX)
137		errx(1, "Integer overflow parsing %s", errname);
138	return (res);
139}
140
141static void
142usage(void)
143{
144
145	(void) fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n",
146		"usage: [id|rt]prio",
147		"       [id|rt]prio [-]pid",
148		"       [id|rt]prio priority command [args]",
149		"       [id|rt]prio priority -pid",
150		"       [id|rt]prio -t command [args]",
151		"       [id|rt]prio -t -pid");
152	exit(1);
153}
154