/*      $NetBSD: t_semtimedop.c,v 1.2 2024/10/10 07:45:02 martin Exp $  */

/*-
* Copyright (c) 2024 The NetBSD Foundation, Inc.
* 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.
*
* 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.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: t_semtimedop.c,v 1.2 2024/10/10 07:45:02 martin Exp $");

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <atf-c.h>
#include <sys/wait.h>

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

ATF_TC(semtimedop_basic);
ATF_TC_HEAD(semtimedop_basic, tc)
{
       atf_tc_set_md_var(tc, "descr", "Basic semtimedop functionality");
}

ATF_TC_BODY(semtimedop_basic, tc)
{
       key_t           key = IPC_PRIVATE;
       int             semid;
       struct sembuf   sops;
       union semun     sun;
       struct timespec timeout;

       /* Create semaphore set with 1 semaphore */
       semid = semget(key, 1, IPC_CREAT | 0600);
       ATF_REQUIRE_MSG(semid != -1, "semget failed: %s", strerror(errno));

       /* Initialize semaphore to 0 */
       sun.val = 0;
       if (semctl(semid, 0, SETVAL, sun) == -1) {
               ATF_REQUIRE_MSG(0, "semctl SETVAL failed: %s",
                   strerror(errno));
       }

       /* Define semtimedop operation: increment semaphore */
       sops.sem_num = 0;
       sops.sem_op = 1;
       sops.sem_flg = 0;

       /* Define timeout */
       timeout.tv_sec = 1;
       timeout.tv_nsec = 0;

       /* Perform semtimedop */
       if (semtimedop(semid, &sops, 1, &timeout) == -1) {
               ATF_REQUIRE_MSG(0, "semtimedop failed: %s", strerror(errno));
       }

       /* Check semaphore value */
       int val = semctl(semid, 0, GETVAL);
       ATF_REQUIRE_MSG(val == 1,
           "Semaphore value incorrect: got %d, expected 1", val);

       /* Clean up */
       ATF_REQUIRE_MSG(semctl(semid, 0, IPC_RMID) != -1,
           "semctl IPC_RMID failed: %s", strerror(errno));
}

/* semtimedop blocks until timeout expires */
ATF_TC(semtimedop_timeout);
ATF_TC_HEAD(semtimedop_timeout, tc)
{
       atf_tc_set_md_var(tc, "descr",
           "semtimedop blocks until timeout expires");
}

ATF_TC_BODY(semtimedop_timeout, tc)
{
       key_t           key = IPC_PRIVATE;
       int             semid;
       struct sembuf   sops;
       union semun     sun;
       struct timespec timeout;
       pid_t           pid;
       int             status;

       /* Create semaphore set with 1 semaphore */
       semid = semget(key, 1, IPC_CREAT | 0600);
       ATF_REQUIRE_MSG(semid != -1, "semget failed: %s", strerror(errno));

       /* Initialize semaphore to 0 */
       sun.val = 0;
       if (semctl(semid, 0, SETVAL, sun) == -1) {
               ATF_REQUIRE_MSG(0, "semctl SETVAL failed: %s", strerror(errno));
       }

       pid = fork();
       ATF_REQUIRE_MSG(pid != -1, "fork failed: %s", strerror(errno));

       if (pid == 0) {
               /*
                * Child: perform semtimedop with negative sem_op, should
                * block until timeout
                */
               sops.sem_num = 0;
               sops.sem_op = -1;
               sops.sem_flg = 0;

               timeout.tv_sec = 2;
               timeout.tv_nsec = 0;

               if (semtimedop(semid, &sops, 1, &timeout) == -1) {
                       if (errno == EAGAIN || errno == EINTR) {
                               exit(0);        /* Expected */
                       }
               }
               exit(1);        /* Unexpected failure/success */
       }

       /* Parent: wait for child to finish */
       waitpid(pid, &status, 0);
       ATF_REQUIRE(WIFEXITED(status));
       ATF_REQUIRE_EQ(WEXITSTATUS(status), 0);

       /* Clean up */
       ATF_REQUIRE_MSG(semctl(semid, 0, IPC_RMID) != -1,
           "semctl IPC_RMID failed: %s", strerror(errno));
}

/* semtimedop with SEM_UNDO adjusts semaphore on exit */
ATF_TC(semtimedop_semundo);
ATF_TC_HEAD(semtimedop_semundo, tc)
{
       atf_tc_set_md_var(tc, "descr",
           "semtimedop with SEM_UNDO adjusts semaphore on exit");
}

ATF_TC_BODY(semtimedop_semundo, tc)
{
       key_t           key = IPC_PRIVATE;
       int             semid;
       struct sembuf   sops;
       union semun     sun;
       struct timespec timeout;
       pid_t           pid;
       int             val;

       /* Create semaphore set with 1 semaphore */
       semid = semget(key, 1, IPC_CREAT | 0600);
       ATF_REQUIRE_MSG(semid != -1, "semget failed: %s", strerror(errno));

       /* Initialize semaphore to 0 */
       sun.val = 0;
       if (semctl(semid, 0, SETVAL, sun) == -1) {
               ATF_REQUIRE_MSG(0, "semctl SETVAL failed: %s", strerror(errno));
       }

       pid = fork();
       ATF_REQUIRE_MSG(pid != -1, "fork failed: %s", strerror(errno));

       if (pid == 0) {
               /* Child: perform semtimedop with SEM_UNDO */
               sops.sem_num = 0;
               sops.sem_op = 1;
               sops.sem_flg = SEM_UNDO;

               timeout.tv_sec = 1;
               timeout.tv_nsec = 0;

               if (semtimedop(semid, &sops, 1, &timeout) == -1) {
                       exit(1);        /* Unexpected failure */
               }

               exit(0); /* Exit normally, SEM_UNDO should be triggered */
       }

       /* Parent: wait for child to exit */
       waitpid(pid, NULL, 0);

       /* Check semaphore value; should be 0 after SEM_UNDO */
       val = semctl(semid, 0, GETVAL);
       ATF_REQUIRE_MSG(val == 0,
           "Semaphore value incorrect after SEM_UNDO: got %d, "
           "expected 0", val);

       /* Clean up */
       ATF_REQUIRE_MSG(semctl(semid, 0, IPC_RMID) != -1,
           "semctl IPC_RMID failed: %s", strerror(errno));
}

/* semtimedop handles invalid parameters correctly */
ATF_TC(semtimedop_invalid);
ATF_TC_HEAD(semtimedop_invalid, tc)
{
       atf_tc_set_md_var(tc, "descr",
           "semtimedop handles invalid parameters correctly");
}

ATF_TC_BODY(semtimedop_invalid, tc)
{
       struct sembuf   sops;
       union semun     sun;
       struct timespec timeout;

       /* Invalid semaphore id */
       sops.sem_num = 0;
       sops.sem_op = -1;
       sops.sem_flg = 0;

       timeout.tv_sec = 1;
       timeout.tv_nsec = 0;

       /* Attempt to perform semtimedop on invalid semid */
       ATF_REQUIRE_MSG(semtimedop(-1, &sops, 1, &timeout) == -1
           && errno == EINVAL, "semtimedop did not fail on invalid semid");

       /* Create semaphore set */
       key_t   key = IPC_PRIVATE;
       int     semid = semget(key, 1, IPC_CREAT | 0600);
       ATF_REQUIRE_MSG(semid != -1, "semget failed: %s", strerror(errno));

       /* Initialize semaphore to 0 */
       sun.val = 0;
       if (semctl(semid, 0, SETVAL, sun) == -1) {
               ATF_REQUIRE_MSG(0, "semctl SETVAL failed: %s", strerror(errno));
       }

       /* Set an invalid semaphore number */
       sops.sem_num = 1;       /* Only 1 semaphore in set, index 0 */
       sops.sem_op = 1;
       sops.sem_flg = 0;

       /* Attempt semtimedop with invalid sem_num */
       ATF_REQUIRE_MSG(semtimedop(semid, &sops, 1, &timeout) == -1
           && errno == EFBIG, "semtimedop did not fail on invalid sem_num");

       /* Clean up */
       ATF_REQUIRE_MSG(semctl(semid, 0, IPC_RMID) != -1,
           "semctl IPC_RMID failed: %s", strerror(errno));
}

ATF_TP_ADD_TCS(tp)
{
       ATF_TP_ADD_TC(tp, semtimedop_basic);
       ATF_TP_ADD_TC(tp, semtimedop_timeout);
       ATF_TP_ADD_TC(tp, semtimedop_semundo);
       ATF_TP_ADD_TC(tp, semtimedop_invalid);

       return atf_no_error();
}

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