/*      $NetBSD: t_aio_cancel.c,v 1.1 2025/10/10 15:53:55 christos Exp $        */

/*
 * Copyright (c) 2025 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 <atf-c.h>

#include <aio.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>

static int      mktemp_file(char *, size_t);
static void     fill_pattern(uint8_t *, size_t, uint8_t);
static void     wait_all(const struct aiocb * const [], size_t);

static int
mktemp_file(char *path, size_t pathlen)
{
        int fd, n;

        n = snprintf(path, pathlen, "t_aio_cancel.XXXXXX");
        ATF_REQUIRE(n > 0 && (size_t)n < pathlen);

        fd = mkstemp(path);
        ATF_REQUIRE(fd >= 0);

        return fd;
}

static void
fill_pattern(uint8_t *buf, size_t len, uint8_t seed)
{
        size_t i;

        for (i = 0; i < len; i++) {
                buf[i] = (uint8_t)(seed + (i & 0xff));
        }
}

static void
wait_all(const struct aiocb * const list[], size_t nent)
{
        size_t i;
        int pending, rv;

        for (;;) {
                pending = 0;

                for (i = 0; i < nent; i++) {
                        int err;

                        if (list[i] == NULL) {
                                continue;
                        }

                        err = aio_error(list[i]);
                        if (err == EINPROGRESS) {
                                pending = 1;
                        }
                }

                if (!pending) {
                        break;
                }

                rv = aio_suspend(list, (int)nent, NULL);
                ATF_REQUIRE_EQ_MSG(0, rv, "aio_suspend failed: %s",
                    strerror(errno));
        }
}

ATF_TC_WITHOUT_HEAD(cancel_active_write);
ATF_TC_BODY(cancel_active_write, tc)
{
        char path[64];
        int fd, rv, crv, err;
        const size_t blksz = 0x1000;
        uint8_t *wbuf;
        struct aiocb cb;
        const struct aiocb *list[1];

        fd = mktemp_file(path, sizeof(path));

        wbuf = malloc(blksz);
        ATF_REQUIRE(wbuf != NULL);
        fill_pattern(wbuf, blksz, 0x33);

        memset(&cb, 0, sizeof(cb));
        cb.aio_fildes = fd;
        cb.aio_buf = wbuf;
        cb.aio_nbytes = blksz;
        cb.aio_offset = 0;

        rv = aio_write(&cb);
        ATF_REQUIRE_EQ(0, rv);

        crv = aio_cancel(fd, &cb);
        ATF_REQUIRE(crv == AIO_CANCELED || crv == AIO_NOTCANCELED
            || crv == AIO_ALLDONE);

        if (crv == AIO_CANCELED) {
                do {
                        err = aio_error(&cb);
                } while (err == EINPROGRESS);
                ATF_REQUIRE_EQ(ECANCELED, err);
                ATF_REQUIRE_EQ(-1, aio_return(&cb));
        } else if (crv == AIO_NOTCANCELED) {
                list[0] = &cb;
                wait_all(list, 1);
                ATF_REQUIRE_EQ(0, aio_error(&cb));
                ATF_REQUIRE_EQ((ssize_t)blksz, aio_return(&cb));
        } else {
                do {
                        err = aio_error(&cb);
                } while (err == EINPROGRESS);
                ATF_REQUIRE_EQ(0, err);
                ATF_REQUIRE_EQ((ssize_t)blksz, aio_return(&cb));
        }

        rv = close(fd);
        ATF_REQUIRE_EQ(0, rv);
        rv = unlink(path);
        ATF_REQUIRE_EQ(0, rv);

        free(wbuf);
}

ATF_TC_WITHOUT_HEAD(cancel_completed_request);
ATF_TC_BODY(cancel_completed_request, tc)
{
        char path[64];
        int fd, rv, crv;
        const size_t blksz = 4096;
        uint8_t *wbuf;
        struct aiocb cb;
        const struct aiocb *list[1];

        fd = mktemp_file(path, sizeof(path));

        wbuf = malloc(blksz);
        ATF_REQUIRE(wbuf != NULL);
        memset(wbuf, 0x7E, blksz);

        memset(&cb, 0, sizeof(cb));
        cb.aio_fildes = fd;
        cb.aio_buf = wbuf;
        cb.aio_nbytes = blksz;
        cb.aio_offset = 0;

        rv = aio_write(&cb);
        ATF_REQUIRE_EQ(0, rv);

        list[0] = &cb;
        wait_all(list, 1);
        ATF_REQUIRE_EQ(0, aio_error(&cb));
        ATF_REQUIRE_EQ((ssize_t)blksz, aio_return(&cb));

        crv = aio_cancel(fd, &cb);
        ATF_REQUIRE_EQ(AIO_ALLDONE, crv);

        rv = close(fd);
        ATF_REQUIRE_EQ(0, rv);
        rv = unlink(path);
        ATF_REQUIRE_EQ(0, rv);

        free(wbuf);
}

ATF_TC_WITHOUT_HEAD(cancel_invalid_fd);
ATF_TC_BODY(cancel_invalid_fd, tc)
{
        struct aiocb cb;
        int crv;

        memset(&cb, 0, sizeof(cb));
        cb.aio_fildes = -1;

        errno = 0;
        crv = aio_cancel(-1, &cb);
        ATF_REQUIRE_EQ(-1, crv);
        ATF_REQUIRE_EQ(EBADF, errno);
}

ATF_TP_ADD_TCS(tp)
{
        ATF_TP_ADD_TC(tp, cancel_active_write);
        ATF_TP_ADD_TC(tp, cancel_completed_request);
        ATF_TP_ADD_TC(tp, cancel_invalid_fd);
        return atf_no_error();
}