xref: /openbsd/usr.bin/ipcrm/ipcrm.c (revision 5b133f3f)
1 /*	$OpenBSD: ipcrm.c,v 1.13 2023/03/08 04:43:11 guenther Exp $*/
2 
3 /*
4  * Copyright (c) 1994 Adam Glass
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. All advertising materials mentioning features or use of this software
16  *    must display the following acknowledgement:
17  *	This product includes software developed by Adam Glass.
18  * 4. The name of the Author may not be used to endorse or promote products
19  *    derived from this software without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY Adam Glass ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL Adam Glass BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  *
33  */
34 
35 #include <sys/types.h>
36 #include <sys/ipc.h>
37 #include <sys/msg.h>
38 #include <sys/sem.h>
39 #include <sys/shm.h>
40 #include <stdio.h>
41 #include <unistd.h>
42 #include <limits.h>
43 #include <stdlib.h>
44 #include <ctype.h>
45 #include <err.h>
46 #include <signal.h>
47 
48 #define IPC_TO_STR(x) (x == 'Q' ? "msq" : (x == 'M' ? "shm" : "sem"))
49 #define IPC_TO_STRING(x) (x == 'Q' ? "message queue" : \
50 	(x == 'M' ? "shared memory segment" : "semaphore"))
51 
52 int signaled;
53 
54 void	usage(void);
55 int	msgrm(key_t, int);
56 int	shmrm(key_t, int);
57 int	semrm(key_t, int);
58 void	not_configured(int);
59 
60 void
usage(void)61 usage(void)
62 {
63 	extern char *__progname;
64 	fprintf(stderr, "usage: %s [-M shmkey] [-m shmid] [-Q msgkey]\n"
65 			"         [-q msqid] [-S semkey] [-s semid] ...\n",
66 		__progname);
67 	exit(1);
68 }
69 
70 int
msgrm(key_t key,int id)71 msgrm(key_t key, int id)
72 {
73 	if (key) {
74 		id = msgget(key, 0);
75 		if (id == -1)
76 			return (-1);
77 	}
78 	return (msgctl(id, IPC_RMID, NULL));
79 }
80 
81 int
shmrm(key_t key,int id)82 shmrm(key_t key, int id)
83 {
84 	if (key) {
85 		id = shmget(key, 0, 0);
86 		if (id == -1)
87 			return (-1);
88 	}
89 	return (shmctl(id, IPC_RMID, NULL));
90 }
91 
92 int
semrm(key_t key,int id)93 semrm(key_t key, int id)
94 {
95 	union semun arg;
96 
97 	if (key) {
98 		id = semget(key, 0, 0);
99 		if (id == -1)
100 			return (-1);
101 	}
102 	return (semctl(id, 0, IPC_RMID, arg));
103 }
104 
105 void
not_configured(int signo)106 not_configured(int signo)
107 {
108 	signaled++;
109 }
110 
111 int
main(int argc,char * argv[])112 main(int argc, char *argv[])
113 {
114 	int c, result, errflg, target_id;
115 	const char *errstr;
116 	key_t target_key;
117 
118 	errflg = 0;
119 	signal(SIGSYS, not_configured);
120 	while ((c = getopt(argc, argv, ":q:m:s:Q:M:S:")) != -1) {
121 		signaled = 0;
122 		switch (c) {
123 		case 'q':
124 		case 'm':
125 		case 's':
126 			target_id = strtonum(optarg, 0, INT_MAX, &errstr);
127 			if (errstr)
128 				errx(1, "-%c %s: %s\n", c, optarg, errstr);
129 			if (c == 'q')
130 				result = msgrm(0, target_id);
131 			else if (c == 'm')
132 				result = shmrm(0, target_id);
133 			else
134 				result = semrm(0, target_id);
135 			if (result < 0) {
136 				errflg++;
137 				if (!signaled)
138 					warn("%sid(%d)",
139 					    IPC_TO_STR(toupper(c)), target_id);
140 				else
141 					warnx("%ss are not configured in the running kernel",
142 					    IPC_TO_STRING(toupper(c)));
143 			}
144 			break;
145 		case 'Q':
146 		case 'M':
147 		case 'S':
148 			target_key = atol(optarg);
149 			if (target_key == IPC_PRIVATE) {
150 				warnx("can't remove private %ss", IPC_TO_STRING(c));
151 				continue;
152 			}
153 			if (c == 'Q')
154 				result = msgrm(target_key, 0);
155 			else if (c == 'M')
156 				result = shmrm(target_key, 0);
157 			else
158 				result = semrm(target_key, 0);
159 			if (result < 0) {
160 				errflg++;
161 				if (!signaled)
162 					warn("%skey(%ld)", IPC_TO_STR(c),
163 					    target_key);
164 				else
165 					warnx("%ss are not configured in the running kernel",
166 					    IPC_TO_STRING(c));
167 			}
168 			break;
169 		case ':':
170 			warnx("option -%c requires an argument", optopt);
171 			usage();
172 		default:
173 			warnx("unrecognized option: -%c", optopt);
174 			usage();
175 		}
176 	}
177 
178 	if (optind != argc) {
179 		warnx("unknown argument: %s", argv[optind]);
180 		usage();
181 	}
182 	exit(errflg);
183 }
184