/*      $OpenBSD: ipcrm.c,v 1.13 2023/03/08 04:43:11 guenther Exp $*/

/*
 * 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.
 *
 */

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

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

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

int
msgrm(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_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_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(int signo)
{
        signaled++;
}

int
main(int argc, char *argv[])
{
        int c, result, errflg, target_id;
        const char *errstr;
        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 = strtonum(optarg, 0, INT_MAX, &errstr);
                        if (errstr)
                                errx(1, "-%c %s: %s\n", c, optarg, errstr);
                        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("%skey(%ld)", 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", optopt);
                        usage();
                default:
                        warnx("unrecognized option: -%c", optopt);
                        usage();
                }
        }

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