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ipcrm.c revision 1.2 
      1 /*
      2  * Copyright (c) 1994 Adam Glass
      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  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. The name of the Author may not be used to endorse or promote products
     11  *    derived from this software without specific prior written permission.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY Adam Glass ``AS IS'' AND
     14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     16  * ARE DISCLAIMED.  IN NO EVENT SHALL Adam Glass BE LIABLE
     17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     23  * SUCH DAMAGE.
     24  *
     25  * $Id: ipcrm.c,v 1.2 1994/03/21 15:46:43 glass Exp $
     26  */
     27 
     28 #include <stdio.h>
     29 #include <unistd.h>
     30 #include <err.h>
     31 #include <signal.h>
     32 #include <sys/types.h>
     33 #include <sys/ipc.h>
     34 #include <sys/msg.h>
     35 #include <sys/sem.h>
     36 #include <sys/shm.h>
     37 
     38 #define IPC_TO_STR(x) (x == 'Q' ? "msq" : (x == 'M' ? "shm" : "sem"))
     39 #define IPC_TO_STRING(x) (x == 'Q' ? "message queue" : \
     40 	(x == 'M' ? "shared memory segment" : "semaphore"))
     41 
     42 int signaled;
     43 
     44 int msgrm(key, id)
     45     key_t key;
     46     int id;
     47 {
     48     if (key) {
     49 	id = msgget(key, 0);
     50 	if (id == -1)
     51 	    return -1;
     52     }
     53     return msgctl(id, IPC_RMID, NULL);
     54 }
     55 
     56 int shmrm(key, id)
     57     key_t key;
     58     int id;
     59 {
     60     if (key) {
     61 	id = shmget(key, 0, 0);
     62 	if (id == -1)
     63 	    return -1;
     64     }
     65     return shmctl(id, IPC_RMID, NULL);
     66 }
     67 
     68 int semrm(key, id)
     69     key_t key;
     70     int id;
     71 {
     72     union semun arg;
     73 
     74     if (key) {
     75 	id = semget(key, 0, 0);
     76 	if (id == -1)
     77 	    return -1;
     78     }
     79     return semctl(id, 0, IPC_RMID, arg);
     80 }
     81 
     82 void not_configured()
     83 {
     84     signaled++;
     85 }
     86 
     87 int main(argc, argv)
     88     int argc;
     89     char *argv[];
     90 
     91 {
     92     int c, result, errflg, target_id;
     93     key_t target_key;
     94 
     95     errflg = 0;
     96     signal(SIGSYS, not_configured);
     97     while ((c = getopt(argc, argv, ":q:m:s:Q:M:S:")) != -1) {
     98 
     99 	signaled = 0;
    100 	switch (c) {
    101 	case 'q':
    102 	case 'm':
    103 	case 's':
    104 	    target_id = atoi(optarg);
    105 	    if (c == 'q')
    106 		result = msgrm(0, target_id);
    107 	    else if (c == 'm')
    108 		result = shmrm(0, target_id);
    109 	    else
    110 		result = semrm(0, target_id);
    111 	    if (result < 0) {
    112 		errflg++;
    113 		if (!signaled)
    114 		    warn("%sid(%d): ", IPC_TO_STR(toupper(c)), target_id);
    115 		else
    116 		    warnx("%ss are not configured in the running kernel",
    117 			  IPC_TO_STRING(toupper(c)));
    118 	    }
    119 	    break;
    120 	case 'Q':
    121 	case 'M':
    122 	case 'S':
    123 	    target_key = atol(optarg);
    124 	    if (target_key == IPC_PRIVATE) {
    125 		warnx("can't remove private %ss", IPC_TO_STRING(c));
    126 		continue;
    127 	    }
    128 	    if (c == 'Q')
    129 		result = msgrm(target_key, 0);
    130 	    else if (c == 'M')
    131 		result = shmrm(target_key, 0);
    132 	    else
    133 		result = semrm(target_key, 0);
    134 	    if (result < 0) {
    135 		errflg++;
    136 		if (!signaled)
    137 		    warn("%key(%ld): ", IPC_TO_STR(c), target_key);
    138 		else
    139 		    warnx("%ss are not configured in the running kernel",
    140 			  IPC_TO_STRING(c));
    141 	    }
    142 	    break;
    143 	case ':':
    144 	    errx(1, "option -%c requires an argument", optopt);
    145 	case '?':
    146 	    errx(1, "unrecognized option: -%c", optopt);
    147 	}
    148     }
    149     if (optind != argc) {
    150 	fprintf(stderr, "usage: ipcrm [ [-q msqid] [-m shmid] [-s semid]\n");
    151 	fprintf(stderr, "        [-Q msgkey] [-M shmkey] [-S semkey] ...]\n");
    152 	exit(1);
    153     }
    154     exit(errflg);
    155 }
    156 
    157