/*
 * Copyright (c) 1994 Adam Glass
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. The name of the Author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Adam Glass ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL Adam Glass BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $Id: ipcrm.c,v 1.2 1994/03/21 15:46:43 glass Exp $
 */

#include <stdio.h>
#include <unistd.h>
#include <err.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/sem.h>
#include <sys/shm.h>

#define IPC_TO_STR(x) (x == 'Q' ? "msq" : (x == 'M' ? "shm" : "sem"))
#define IPC_TO_STRING(x) (x == 'Q' ? "message queue" : \
	(x == 'M' ? "shared memory segment" : "semaphore"))

int signaled;

int msgrm(key, id)
    key_t key;
    int id;
{
    if (key) {
	id = msgget(key, 0);
	if (id == -1)
	    return -1;
    }
    return msgctl(id, IPC_RMID, NULL);    
}

int shmrm(key, id)
    key_t key;
    int id;
{
    if (key) {
	id = shmget(key, 0, 0);
	if (id == -1)
	    return -1;
    }
    return shmctl(id, IPC_RMID, NULL);
}

int semrm(key, id)
    key_t key;
    int id;
{
    union semun arg;

    if (key) {
	id = semget(key, 0, 0);
	if (id == -1)
	    return -1;
    }
    return semctl(id, 0, IPC_RMID, arg);
}

void not_configured()
{
    signaled++;
}
    
int main(argc, argv)
    int argc;
    char *argv[];

{
    int c, result, errflg, target_id;
    key_t target_key;

    errflg = 0;
    signal(SIGSYS, not_configured);
    while ((c = getopt(argc, argv, ":q:m:s:Q:M:S:")) != -1) {

	signaled = 0;
	switch (c) {
	case 'q':
	case 'm':
	case 's':
	    target_id = atoi(optarg);
	    if (c == 'q')
		result = msgrm(0, target_id);
	    else if (c == 'm')
		result = shmrm(0, target_id);
	    else
		result = semrm(0, target_id);
	    if (result < 0) {
		errflg++;
		if (!signaled)
		    warn("%sid(%d): ", IPC_TO_STR(toupper(c)), target_id);
		else
		    warnx("%ss are not configured in the running kernel",
			  IPC_TO_STRING(toupper(c)));
	    }
	    break;
	case 'Q':
	case 'M':
	case 'S':
	    target_key = atol(optarg);
	    if (target_key == IPC_PRIVATE) {
		warnx("can't remove private %ss", IPC_TO_STRING(c));
		continue;
	    }
	    if (c == 'Q')
		result = msgrm(target_key, 0);
	    else if (c == 'M')
		result = shmrm(target_key, 0);
	    else
		result = semrm(target_key, 0);
	    if (result < 0) {
		errflg++;
		if (!signaled)
		    warn("%key(%ld): ", IPC_TO_STR(c), target_key);
		else
		    warnx("%ss are not configured in the running kernel",
			  IPC_TO_STRING(c));
	    }
	    break;
	case ':':
	    errx(1, "option -%c requires an argument", optopt);
	case '?':
	    errx(1, "unrecognized option: -%c", optopt);
	}
    }
    if (optind != argc) {
	fprintf(stderr, "usage: ipcrm [ [-q msqid] [-m shmid] [-s semid]\n");
	fprintf(stderr, "        [-Q msgkey] [-M shmkey] [-S semkey] ...]\n");
	exit(1);
    }
    exit(errflg);
}