1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1994 David Greenman
5 * Copyright (c) 1994 Henrik Vestergaard Draboel (hvd@terry.ping.dk)
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by Henrik Vestergaard Draboel.
19 *	This product includes software developed by David Greenman.
20 * 4. Neither the names of the authors nor the names of contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD$");
39
40#include <sys/param.h>
41#include <sys/rtprio.h>
42
43#include <ctype.h>
44#include <err.h>
45#include <errno.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49#include <unistd.h>
50
51static int parseint(const char *, const char *);
52static void usage(void);
53
54int
55main(int argc, char *argv[])
56{
57	struct rtprio rtp;
58	const char *progname;
59	pid_t proc = 0;
60
61	progname = getprogname();
62
63	if (strcmp(progname, "rtprio") == 0)
64		rtp.type = RTP_PRIO_REALTIME;
65	else if (strcmp(progname, "idprio") == 0)
66		rtp.type = RTP_PRIO_IDLE;
67	else
68		errx(1, "invalid progname");
69
70	switch (argc) {
71	case 2:
72		proc = parseint(argv[1], "pid");
73		proc = abs(proc);
74		/* FALLTHROUGH */
75	case 1:
76		if (rtprio(RTP_LOOKUP, proc, &rtp) != 0)
77			err(1, "RTP_LOOKUP");
78		switch (rtp.type) {
79		case RTP_PRIO_REALTIME:
80		case RTP_PRIO_FIFO:
81			warnx("realtime priority %d", rtp.prio);
82			break;
83		case RTP_PRIO_NORMAL:
84			warnx("normal priority");
85			break;
86		case RTP_PRIO_IDLE:
87			warnx("idle priority %d", rtp.prio);
88			break;
89		default:
90			errx(1, "invalid priority type %d", rtp.type);
91			break;
92		}
93		exit(0);
94	default:
95		if (argv[1][0] == '-' || isdigit(argv[1][0])) {
96			if (argv[1][0] == '-') {
97				if (strcmp(argv[1], "-t") == 0) {
98					rtp.type = RTP_PRIO_NORMAL;
99					rtp.prio = 0;
100				} else {
101					usage();
102					break;
103				}
104			} else
105				rtp.prio = parseint(argv[1], "priority");
106		} else {
107			usage();
108			break;
109		}
110
111		if (argv[2][0] == '-') {
112			proc = parseint(argv[2], "pid");
113			proc = abs(proc);
114		}
115
116		if (rtprio(RTP_SET, proc, &rtp) != 0)
117			err(1, "RTP_SET");
118
119		if (proc == 0) {
120			execvp(argv[2], &argv[2]);
121			err(1, "execvp: %s", argv[2]);
122		}
123		exit(0);
124	}
125	/* NOTREACHED */
126}
127
128static int
129parseint(const char *str, const char *errname)
130{
131	char *endp;
132	long res;
133
134	errno = 0;
135	res = strtol(str, &endp, 10);
136	if (errno != 0 || endp == str || *endp != '\0')
137		errx(1, "%s must be a number", errname);
138	if (res >= INT_MAX)
139		errx(1, "Integer overflow parsing %s", errname);
140	return (res);
141}
142
143static void
144usage(void)
145{
146
147	(void) fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n",
148		"usage: [id|rt]prio",
149		"       [id|rt]prio [-]pid",
150		"       [id|rt]prio priority command [args]",
151		"       [id|rt]prio priority -pid",
152		"       [id|rt]prio -t command [args]",
153		"       [id|rt]prio -t -pid");
154	exit(1);
155}
156