/*
 * 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. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Adam Glass.
 * 4. 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.
 *
 * $FreeBSD: src/usr.bin/ipcrm/ipcrm.c,v 1.6 1999/08/28 01:02:14 peter Exp $
 */

#include <ctype.h>
#include <err.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.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"))

volatile sig_atomic_t  signaled;

static void     usage(void) __dead2;
static int      msgrm(key_t, int);
static int      shmrm(key_t, int);
static int      semrm(key_t, int);
static void     not_configured(int);

static void 
usage(void)
{
        fprintf(stderr, "%s\n%s\n",
                "usage: ipcrm [-q msqid] [-m shmid] [-s semid]",
                "             [-Q msgkey] [-M shmkey] [-S semkey] ...");
        exit(1);
}

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

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

static int
semrm(key_t key, int id)
{
    if (key) {
        id = semget(key, 0, 0);
        if (id == -1)
            return -1;
    }
    return semctl(id, 0, IPC_RMID);
}

static void
not_configured(int signo __unused)
{
    signaled++;
}

int
main(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("%s key %ld aborted", IPC_TO_STR(c), target_key);
                else
                    warnx("%ss are not configured in the running kernel",
                          IPC_TO_STRING(c));
            }
            break;
        case ':':
            warnx("option -%c requires an argument\n", optopt);
            usage();
        case '?':
            warnx("unrecognized option: -%c\n", optopt);
            usage();
        }
    }

    if (optind != argc) {
            warnx("unknown argument: %s\n", argv[optind]);
            usage();
    }
    exit(errflg);
}