/*      $NetBSD: t_sysv.c,v 1.6 2022/05/14 14:02:03 christos Exp $      */

/*-
 * Copyright (c) 1999, 2007 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center, and by Andrew Doran.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 THE FOUNDATION OR CONTRIBUTORS
 * 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.
 */

/*
 * Test the SVID-compatible Message Queue facility.
 */

#include <atf-c.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>

#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/param.h>
#include <sys/sem.h>
#include <sys/shm.h>
#include <sys/wait.h>

volatile int did_sigsys;

void    sigsys_handler(int);

key_t   get_ftok(int);

void    print_msqid_ds(struct msqid_ds *, mode_t);
void    receiver(void);

void    print_semid_ds(struct semid_ds *, mode_t);
void    waiter(void);

void    print_shmid_ds(struct shmid_ds *, mode_t);
void    sharer(void);

#define MESSAGE_TEXT_LEN        256

struct testmsg {
        long    mtype;
        char    mtext[MESSAGE_TEXT_LEN];
};

const char *m1_str = "California is overrated.";
const char *m2_str = "The quick brown fox jumped over the lazy dog.";

size_t  pgsize;

#define MTYPE_1         1
#define MTYPE_1_ACK     2

#define MTYPE_2         3
#define MTYPE_2_ACK     4

pid_t   child_pid;

key_t   msgkey, semkey, shmkey;

int     maxloop = 1;

union semun {
        int     val;            /* value for SETVAL */
        struct  semid_ds *buf;  /* buffer for IPC_{STAT,SET} */
        u_short *array;         /* array for GETALL & SETALL */
};


/* Writes an integer to a file.  To be used from the body of the test
 * cases below to pass any global identifiers to the cleanup routine. */
static void
write_int(const char *path, const int value)
{
        int output;

        output = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0600);
        ATF_REQUIRE_MSG(output != -1, "Failed to create %s", path);
        write(output, &value, sizeof(value));
        close(output);
}


/* Reads an integer from a file.  To be used from the cleanup routines
 * of the test cases below. */
static int
read_int(const char *path)
{
        int input, value;

        input = open(path, O_RDONLY);
        if (input == -1)
                return -1;

        read(input, &value, sizeof(value));
        return value;
}


void
sigsys_handler(int signo)
{

        did_sigsys = 1;
}

key_t get_ftok(int id)
{
        int fd;
        char token_key[64], token_dir[64];
        char *tmpdir;
        key_t key;

        strlcpy(token_key, "/tmp/t_sysv.XXXXXX", sizeof(token_key));
        tmpdir = mkdtemp(token_key);
        ATF_REQUIRE_MSG(tmpdir != NULL, "mkdtemp() failed: %d", errno);

        strlcpy(token_dir, tmpdir, sizeof(token_dir));
        strlcpy(token_key, tmpdir, sizeof(token_key));
        strlcat(token_key, "/token_key", sizeof(token_key));

        /* Create the file, since ftok() requires it to exist! */

        fd = open(token_key, O_RDWR | O_CREAT | O_EXCL, 0600);
        if (fd == -1) {
                rmdir(tmpdir);
                atf_tc_fail("open() of temp file failed: %d", errno);
                return (key_t)-1;
        }

        close(fd);

        key = ftok(token_key, id);
        ATF_REQUIRE_MSG(key != (key_t)-1, "ftok() failed");

        ATF_REQUIRE_MSG(unlink(token_key) != -1, "unlink() failed: %d", errno);
        ATF_REQUIRE_MSG(rmdir(token_dir) != -1, "rmdir() failed: %d", errno);

        return key;
}

ATF_TC_WITH_CLEANUP(msg);
ATF_TC_HEAD(msg, tc)
{  

        atf_tc_set_md_var(tc, "timeout", "3");
        atf_tc_set_md_var(tc, "descr", "Checks sysvmsg passing");
}

ATF_TC_BODY(msg, tc)
{
        struct sigaction sa;
        struct msqid_ds m_ds;
        struct testmsg m;
        int sender_msqid;
        int loop;
        int c_status;
        pid_t wait_result;

        /*
         * Install a SIGSYS handler so that we can exit gracefully if
         * System V Message Queue support isn't in the kernel.
         */
        did_sigsys = 0;
        sa.sa_handler = sigsys_handler;
        sigemptyset(&sa.sa_mask);
        sa.sa_flags = 0;
        ATF_REQUIRE_MSG(sigaction(SIGSYS, &sa, NULL) != -1,
            "sigaction SIGSYS: %d", errno);

        msgkey = get_ftok(4160);
        ATF_REQUIRE_MSG(msgkey != (key_t)-1, "get_ftok failed");

        sender_msqid = msgget(msgkey, IPC_CREAT | 0640);
        ATF_REQUIRE_MSG(sender_msqid != -1, "msgget: %d", errno);
        write_int("sender_msqid", sender_msqid);

        if (did_sigsys) {
                atf_tc_skip("SYSV Message Queue not supported");
                return;
        }

        ATF_REQUIRE_MSG(msgctl(sender_msqid, IPC_STAT, &m_ds) != -1,
        "msgctl IPC_STAT 1: %d", errno);

        print_msqid_ds(&m_ds, 0640);

        m_ds.msg_perm.mode = (m_ds.msg_perm.mode & ~0777) | 0600;

        ATF_REQUIRE_MSG(msgctl(sender_msqid, IPC_SET, &m_ds) != -1,
            "msgctl IPC_SET: %d", errno);

        memset(&m_ds, 0, sizeof(m_ds));

        ATF_REQUIRE_MSG(msgctl(sender_msqid, IPC_STAT, &m_ds) != -1,
            "msgctl IPC_STAT 2: %d", errno);

        ATF_REQUIRE_MSG((m_ds.msg_perm.mode & 0777) == 0600,
            "IPC_SET of mode didn't hold");

        print_msqid_ds(&m_ds, 0600);

        fflush(stdout);

        switch ((child_pid = fork())) {
        case -1:
                atf_tc_fail("fork: %d", errno);
                return;

        case 0:
                receiver();
                break;

        default:
                break;
        }

        for (loop = 0; loop < maxloop; loop++) {
                /*
                 * Send the first message to the receiver and wait for the ACK.
                 */
                m.mtype = MTYPE_1;
                strcpy(m.mtext, m1_str);
                ATF_REQUIRE_MSG(msgsnd(sender_msqid, &m, MESSAGE_TEXT_LEN,
                    0) != -1, "sender: msgsnd 1: %d", errno);

                ATF_REQUIRE_MSG(msgrcv(sender_msqid, &m, MESSAGE_TEXT_LEN,
                    MTYPE_1_ACK, 0) == MESSAGE_TEXT_LEN,
                    "sender: msgrcv 1 ack: %d", errno);

                print_msqid_ds(&m_ds, 0600);

                /*
                 * Send the second message to the receiver and wait for the ACK.
                 */
                m.mtype = MTYPE_2;
                strcpy(m.mtext, m2_str);
                ATF_REQUIRE_MSG(msgsnd(sender_msqid, &m, MESSAGE_TEXT_LEN, 0)
                    != -1, "sender: msgsnd 2: %d", errno);

                ATF_REQUIRE_MSG(msgrcv(sender_msqid, &m, MESSAGE_TEXT_LEN,
                    MTYPE_2_ACK, 0) == MESSAGE_TEXT_LEN,
                    "sender: msgrcv 2 ack: %d", errno);
        }

        /*
         * Wait for child to finish
         */
        wait_result = wait(&c_status);
        ATF_REQUIRE_EQ_MSG(wait_result, child_pid, "wait returned %d (%s)",
            wait_result, wait_result == -1 ? strerror(errno) : "");
        ATF_REQUIRE_MSG(WIFEXITED(c_status), "child abnormal exit: %d (sig %d)",
            c_status, WTERMSIG(c_status));
        ATF_REQUIRE_EQ_MSG(WEXITSTATUS(c_status), 0, "child status: %d",
            WEXITSTATUS(c_status));

        ATF_REQUIRE_MSG(msgctl(sender_msqid, IPC_STAT, &m_ds) != -1,
            "msgctl IPC_STAT: %d", errno);

        print_msqid_ds(&m_ds, 0600);
}

ATF_TC_CLEANUP(msg, tc)
{
        int sender_msqid;

        /*
         * Remove the message queue if it exists.
         */
        sender_msqid = read_int("sender_msqid");
        if (sender_msqid == -1)
                return;
        if (msgctl(sender_msqid, IPC_RMID, NULL) == -1)
                err(EXIT_FAILURE, "msgctl IPC_RMID");
}

void
print_msqid_ds(struct msqid_ds *mp, mode_t mode)
{
        uid_t uid = geteuid();
        gid_t gid = getegid();

        printf("PERM: uid %d, gid %d, cuid %d, cgid %d, mode 0%o\n",
            mp->msg_perm.uid, mp->msg_perm.gid,
            mp->msg_perm.cuid, mp->msg_perm.cgid,
            mp->msg_perm.mode & 0777);

        printf("qnum %lu, qbytes %ju, lspid %d, lrpid %d\n",
            mp->msg_qnum, (uintmax_t)mp->msg_qbytes, mp->msg_lspid,
            mp->msg_lrpid);

        printf("stime: %s", ctime(&mp->msg_stime));
        printf("rtime: %s", ctime(&mp->msg_rtime));
        printf("ctime: %s", ctime(&mp->msg_ctime));

        /*
         * Sanity check a few things.
         */

        ATF_REQUIRE_MSG(mp->msg_perm.uid == uid && mp->msg_perm.cuid == uid,
            "uid mismatch");

        ATF_REQUIRE_MSG(mp->msg_perm.gid == gid && mp->msg_perm.cgid == gid,
            "gid mismatch");

        ATF_REQUIRE_MSG((mp->msg_perm.mode & 0777) == mode, "mode mismatch");
}

void
receiver(void)
{
        struct testmsg m;
        int msqid, loop;

        if ((msqid = msgget(msgkey, 0)) == -1)
                err(EXIT_FAILURE, "receiver: msgget");

        for (loop = 0; loop < maxloop; loop++) {
                /*
                 * Receive the first message, print it, and send an ACK.
                 */
                if (msgrcv(msqid, &m, MESSAGE_TEXT_LEN, MTYPE_1, 0)
                    != MESSAGE_TEXT_LEN)
                        err(EXIT_FAILURE, "receiver: msgrcv 1");

                printf("%s\n", m.mtext);
                if (strcmp(m.mtext, m1_str) != 0)
                        errx(EXIT_FAILURE,
                            "receiver: message 1 data isn't correct");

                m.mtype = MTYPE_1_ACK;

                if (msgsnd(msqid, &m, MESSAGE_TEXT_LEN, 0) == -1)
                        err(EXIT_FAILURE, "receiver: msgsnd ack 1");

                /*
                 * Receive the second message, print it, and send an ACK.
                 */

                if (msgrcv(msqid, &m, MESSAGE_TEXT_LEN, MTYPE_2, 0)
                    != MESSAGE_TEXT_LEN)
                        err(EXIT_FAILURE, "receiver: msgrcv 2");

                printf("%s\n", m.mtext);
                if (strcmp(m.mtext, m2_str) != 0)
                        errx(EXIT_FAILURE,
                            "receiver: message 2 data isn't correct");

                m.mtype = MTYPE_2_ACK;

                if (msgsnd(msqid, &m, MESSAGE_TEXT_LEN, 0) == -1)
                        err(EXIT_FAILURE, "receiver: msgsnd ack 2");
        }

        exit(EXIT_SUCCESS);
}

/*
 * Test the SVID-compatible Semaphore facility.
 */

ATF_TC_WITH_CLEANUP(sem);
ATF_TC_HEAD(sem, tc)
{  

        atf_tc_set_md_var(tc, "timeout", "3");
        atf_tc_set_md_var(tc, "descr", "Checks sysvmsg passing");
}

ATF_TC_BODY(sem, tc)
{
        struct sigaction sa;
        union semun sun;
        struct semid_ds s_ds;
        int sender_semid;
        int i;
        int c_status;
        int child_count;
        pid_t wait_result;

        /*
         * Install a SIGSYS handler so that we can exit gracefully if
         * System V Semaphore support isn't in the kernel.
         */
        did_sigsys = 0;
        sa.sa_handler = sigsys_handler;
        sigemptyset(&sa.sa_mask);
        sa.sa_flags = 0;
        ATF_REQUIRE_MSG(sigaction(SIGSYS, &sa, NULL) != -1,
            "sigaction SIGSYS: %d", errno);

        semkey = get_ftok(4160);
        ATF_REQUIRE_MSG(semkey != (key_t)-1, "get_ftok failed");

        sender_semid = semget(semkey, 1, IPC_CREAT | 0640);
        ATF_REQUIRE_MSG(sender_semid != -1, "semget: %d", errno);
        write_int("sender_semid", sender_semid);

        if (did_sigsys) {
                atf_tc_skip("SYSV Semaphore not supported");
                return;
        }
        
        sun.buf = &s_ds;
        ATF_REQUIRE_MSG(semctl(sender_semid, 0, IPC_STAT, sun) != -1,
            "semctl IPC_STAT: %d", errno);

        print_semid_ds(&s_ds, 0640);

        s_ds.sem_perm.mode = (s_ds.sem_perm.mode & ~0777) | 0600;

        sun.buf = &s_ds;
        ATF_REQUIRE_MSG(semctl(sender_semid, 0, IPC_SET, sun) != -1,
            "semctl IPC_SET: %d", errno);

        memset(&s_ds, 0, sizeof(s_ds));

        sun.buf = &s_ds;
        ATF_REQUIRE_MSG(semctl(sender_semid, 0, IPC_STAT, sun) != -1,
            "semctl IPC_STAT: %d", errno);

        ATF_REQUIRE_MSG((s_ds.sem_perm.mode & 0777) == 0600,
            "IPC_SET of mode didn't hold");

        print_semid_ds(&s_ds, 0600);

        fflush(stdout);

        for (child_count = 0; child_count < 5; child_count++) {
                switch ((child_pid = fork())) {
                case -1:
                        atf_tc_fail("fork: %d", errno);
                        return;

                case 0:
                        waiter();
                        break;

                default:
                        break;
                }
        }

        /*
         * Wait for all of the waiters to be attempting to acquire the
         * semaphore.
         */
        for (;;) {
                i = semctl(sender_semid, 0, GETNCNT);
                if (i == -1)
                        atf_tc_fail("semctl GETNCNT: %d", i);
                if (i == 5)
                        break;
        }

        /*
         * Now set the thundering herd in motion by initializing the
         * semaphore to the value 1.
         */
        sun.val = 1;
        ATF_REQUIRE_MSG(semctl(sender_semid, 0, SETVAL, sun) != -1,
            "sender: semctl SETVAL to 1: %d", errno);

        /*
         * Wait for all children to finish
         */
        while (child_count-- > 0) {
                wait_result = wait(&c_status);
                ATF_REQUIRE_MSG(wait_result != -1, "wait failed: %s",
                    strerror(errno));
                ATF_REQUIRE_MSG(WIFEXITED(c_status),
                    "child abnormal exit: %d (sig %d)",
                    c_status, WTERMSIG(c_status));
                ATF_REQUIRE_EQ_MSG(WEXITSTATUS(c_status), 0, "child status: %d",
                    WEXITSTATUS(c_status));

                sun.buf = &s_ds;
                ATF_REQUIRE_MSG(semctl(sender_semid, 0, IPC_STAT, sun) != -1,
                    "semctl IPC_STAT: %d", errno);

                print_semid_ds(&s_ds, 0600);
        }
}

ATF_TC_CLEANUP(sem, tc)
{
        int sender_semid;

        /*
         * Remove the semaphore if it exists
         */
        sender_semid = read_int("sender_semid");
        if (sender_semid == -1)
                return;
        if (semctl(sender_semid, 0, IPC_RMID) == -1)
                err(EXIT_FAILURE, "semctl IPC_RMID");
}

void
print_semid_ds(struct semid_ds *sp, mode_t mode)
{
        uid_t uid = geteuid();
        gid_t gid = getegid();

        printf("PERM: uid %d, gid %d, cuid %d, cgid %d, mode 0%o\n",
            sp->sem_perm.uid, sp->sem_perm.gid,
            sp->sem_perm.cuid, sp->sem_perm.cgid,
            sp->sem_perm.mode & 0777);

        printf("nsems %u\n", sp->sem_nsems);

        printf("otime: %s", ctime(&sp->sem_otime));
        printf("ctime: %s", ctime(&sp->sem_ctime));

        /*
         * Sanity check a few things.
         */

        ATF_REQUIRE_MSG(sp->sem_perm.uid == uid && sp->sem_perm.cuid == uid,
            "uid mismatch");

        ATF_REQUIRE_MSG(sp->sem_perm.gid == gid && sp->sem_perm.cgid == gid,
            "gid mismatch");

        ATF_REQUIRE_MSG((sp->sem_perm.mode & 0777) == mode,
            "mode mismatch %o != %o", (sp->sem_perm.mode & 0777), mode);
}

void
waiter(void)
{
        struct sembuf s;
        int semid;

        if ((semid = semget(semkey, 1, 0)) == -1)
                err(EXIT_FAILURE, "waiter: semget");

        /*
         * Attempt to acquire the semaphore.
         */
        s.sem_num = 0;
        s.sem_op = -1;
        s.sem_flg = SEM_UNDO;

        if (semop(semid, &s, 1) == -1)
                err(EXIT_FAILURE, "waiter: semop -1");

        printf("WOO!  GOT THE SEMAPHORE!\n");
        usleep(10000);

        /*
         * Release the semaphore and exit.
         */
        s.sem_num = 0;
        s.sem_op = 1;
        s.sem_flg = SEM_UNDO;

        if (semop(semid, &s, 1) == -1)
                err(EXIT_FAILURE, "waiter: semop +1");

        exit(EXIT_SUCCESS);
}

/*
 * Test the SVID-compatible Shared Memory facility.
 */

ATF_TC_WITH_CLEANUP(shm);
ATF_TC_HEAD(shm, tc)
{  

        atf_tc_set_md_var(tc, "timeout", "3");
        atf_tc_set_md_var(tc, "descr", "Checks sysv shared memory");
}

ATF_TC_BODY(shm, tc)
{
        struct sigaction sa;
        struct shmid_ds s_ds;
        char *shm_buf;
        int sender_shmid;
        int c_status;
        pid_t wait_result;

        /*
         * Install a SIGSYS handler so that we can exit gracefully if
         * System V Shared Memory support isn't in the kernel.
         */
        did_sigsys = 0;
        sa.sa_handler = sigsys_handler;
        sigemptyset(&sa.sa_mask);
        sa.sa_flags = 0;
        ATF_REQUIRE_MSG(sigaction(SIGSYS, &sa, NULL) != -1,
            "sigaction SIGSYS: %d", errno);

        pgsize = sysconf(_SC_PAGESIZE);

        shmkey = get_ftok(4160);
        ATF_REQUIRE_MSG(shmkey != (key_t)-1, "get_ftok failed");

        ATF_REQUIRE_MSG((sender_shmid = shmget(shmkey, pgsize,
                                               IPC_CREAT | 0640)) != -1,
            "shmget: %d", errno);
        write_int("sender_shmid", sender_shmid);

        ATF_REQUIRE_MSG(shmctl(sender_shmid, IPC_STAT, &s_ds) != -1,
            "shmctl IPC_STAT: %d", errno);

        print_shmid_ds(&s_ds, 0640);

        s_ds.shm_perm.mode = (s_ds.shm_perm.mode & ~0777) | 0600;

        ATF_REQUIRE_MSG(shmctl(sender_shmid, IPC_SET, &s_ds) != -1,
            "shmctl IPC_SET: %d", errno);

        memset(&s_ds, 0, sizeof(s_ds));

        ATF_REQUIRE_MSG(shmctl(sender_shmid, IPC_STAT, &s_ds) != -1,
            "shmctl IPC_STAT: %d", errno);

        ATF_REQUIRE_MSG((s_ds.shm_perm.mode & 0777) == 0600,
            "IPC_SET of mode didn't hold");

        print_shmid_ds(&s_ds, 0600);

        shm_buf = shmat(sender_shmid, NULL, 0);
        ATF_REQUIRE_MSG(shm_buf != (void *) -1, "sender: shmat: %d", errno);

        /*
         * Write the test pattern into the shared memory buffer.
         */
        strcpy(shm_buf, m2_str);

        fflush(stdout);

        switch ((child_pid = fork())) {
        case -1:
                atf_tc_fail("fork: %d", errno);
                return;

        case 0:
                sharer();
                break;

        default:
                break;
        }

        /*
         * Wait for child to finish
         */
        wait_result = wait(&c_status);
        ATF_REQUIRE_EQ_MSG(wait_result, child_pid, "wait returned %d (%s)",
            wait_result, wait_result == -1 ? strerror(errno) : "");
        ATF_REQUIRE_MSG(WIFEXITED(c_status), "child abnormal exit: %d (sig %d)",
            c_status, WTERMSIG(c_status));
        ATF_REQUIRE_EQ_MSG(WEXITSTATUS(c_status), 0, "child status: %d",
            WEXITSTATUS(c_status));

        ATF_REQUIRE_MSG(shmctl(sender_shmid, IPC_STAT, &s_ds) != -1,
            "shmctl IPC_STAT: %d", errno);

        print_shmid_ds(&s_ds, 0600);
}

ATF_TC_CLEANUP(shm, tc)
{
        int sender_shmid;

        /*
         * Remove the shared memory area if it exists.
         */
        sender_shmid = read_int("sender_shmid");
        if (sender_shmid == -1)
                return;
        if (shmctl(sender_shmid, IPC_RMID, NULL) == -1)
                err(EXIT_FAILURE, "shmctl IPC_RMID");
}

void
print_shmid_ds(struct shmid_ds *sp, mode_t mode)
{
        uid_t uid = geteuid();
        gid_t gid = getegid();

        printf("PERM: uid %d, gid %d, cuid %d, cgid %d, mode 0%o\n",
            sp->shm_perm.uid, sp->shm_perm.gid,
            sp->shm_perm.cuid, sp->shm_perm.cgid,
            sp->shm_perm.mode & 0777);

        printf("segsz %ju, lpid %d, cpid %d, nattch %u\n",
            (uintmax_t)sp->shm_segsz, sp->shm_lpid, sp->shm_cpid,
            sp->shm_nattch);

        printf("atime: %s", ctime(&sp->shm_atime));
        printf("dtime: %s", ctime(&sp->shm_dtime));
        printf("ctime: %s", ctime(&sp->shm_ctime));

        /*
         * Sanity check a few things.
         */

        ATF_REQUIRE_MSG(sp->shm_perm.uid == uid && sp->shm_perm.cuid == uid,
            "uid mismatch");

        ATF_REQUIRE_MSG(sp->shm_perm.gid == gid && sp->shm_perm.cgid == gid,
            "gid mismatch");

        ATF_REQUIRE_MSG((sp->shm_perm.mode & 0777) == mode,
            "mode mismatch %o != %o", sp->shm_perm.mode & 0777, mode);
}

void
sharer(void)
{
        int shmid;
        void *shm_buf;

        shmid = shmget(shmkey, pgsize, 0);
        if (shmid == -1)
                err(EXIT_FAILURE, "receiver: shmget");

        shm_buf = shmat(shmid, NULL, 0);
        if (shm_buf == (void *) -1)
                err(EXIT_FAILURE, "receiver: shmat");

        printf("%s\n", (const char *)shm_buf);

        if (strcmp((const char *)shm_buf, m2_str) != 0)
                errx(EXIT_FAILURE, "receiver: data isn't correct");

        exit(EXIT_SUCCESS);
}

ATF_TP_ADD_TCS(tp)
{

        ATF_TP_ADD_TC(tp, msg); 
        ATF_TP_ADD_TC(tp, sem); 
        ATF_TP_ADD_TC(tp, shm); 

        return atf_no_error();
}