source: mainline/uspace/srv/test/chardev-test/main.c

/*
 * Copyright (c) 2025 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - 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 THE AUTHOR ``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 AUTHOR 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.
 */

/** @addtogroup chardev-test
 * @{
 */
/**
 * @file
 * @brief Character device interface test service
 */

#include <async.h>
#include <errno.h>
#include <str_error.h>
#include <io/chardev_srv.h>
#include <ipc/services.h>
#include <loc.h>
#include <mem.h>
#include <stdio.h>
#include <task.h>

#define NAME  "chardev-test"

static errno_t smallx_open(chardev_srvs_t *, chardev_srv_t *);
static errno_t smallx_close(chardev_srv_t *);
static errno_t smallx_write(chardev_srv_t *, const void *, size_t, size_t *);
static errno_t smallx_read(chardev_srv_t *, void *, size_t, size_t *,
    chardev_flags_t);

static errno_t largex_open(chardev_srvs_t *, chardev_srv_t *);
static errno_t largex_close(chardev_srv_t *);
static errno_t largex_write(chardev_srv_t *, const void *, size_t, size_t *);
static errno_t largex_read(chardev_srv_t *, void *, size_t, size_t *,
    chardev_flags_t);

static errno_t partialx_open(chardev_srvs_t *, chardev_srv_t *);
static errno_t partialx_close(chardev_srv_t *);
static errno_t partialx_write(chardev_srv_t *, const void *, size_t, size_t *);
static errno_t partialx_read(chardev_srv_t *, void *, size_t, size_t *,
    chardev_flags_t);

static service_id_t smallx_svc_id;
static chardev_srvs_t smallx_srvs;

static service_id_t largex_svc_id;
static chardev_srvs_t largex_srvs;

static service_id_t partialx_svc_id;
static chardev_srvs_t partialx_srvs;

static chardev_ops_t chardev_test_smallx_ops = {
        .open = smallx_open,
        .close = smallx_close,
        .write = smallx_write,
        .read = smallx_read
};

static chardev_ops_t chardev_test_largex_ops = {
        .open = largex_open,
        .close = largex_close,
        .write = largex_write,
        .read = largex_read
};

static chardev_ops_t chardev_test_partialx_ops = {
        .open = partialx_open,
        .close = partialx_close,
        .write = partialx_write,
        .read = partialx_read
};

static void chardev_test_connection(ipc_call_t *icall, void *arg)
{
        chardev_srvs_t *svc;
        sysarg_t svcid;

        svcid = ipc_get_arg2(icall);
        if (svcid == smallx_svc_id) {
                svc = &smallx_srvs;
        } else if (svcid == largex_svc_id) {
                svc = &largex_srvs;
        } else if (svcid == partialx_svc_id) {
                svc = &partialx_srvs;
        } else {
                async_answer_0(icall, ENOENT);
                return;
        }

        chardev_conn(icall, svc);
}

int main(int argc, char *argv[])
{
        errno_t rc;
        loc_srv_t *srv;

        printf("%s: Character device test service\n", NAME);
        async_set_fallback_port_handler(chardev_test_connection, NULL);

        rc = loc_server_register(NAME, &srv);
        if (rc != EOK) {
                printf("%s: Failed registering server.: %s\n", NAME, str_error(rc));
                return rc;
        }

        chardev_srvs_init(&smallx_srvs);
        smallx_srvs.ops = &chardev_test_smallx_ops;
        smallx_srvs.sarg = NULL;

        chardev_srvs_init(&largex_srvs);
        largex_srvs.ops = &chardev_test_largex_ops;
        largex_srvs.sarg = NULL;

        chardev_srvs_init(&partialx_srvs);
        partialx_srvs.ops = &chardev_test_partialx_ops;
        partialx_srvs.sarg = NULL;

        rc = loc_service_register(srv, SERVICE_NAME_CHARDEV_TEST_SMALLX,
            fallback_port_id, &smallx_svc_id);
        if (rc != EOK) {
                printf("%s: Failed registering service.: %s\n", NAME, str_error(rc));
                goto error;
        }

        rc = loc_service_register(srv, SERVICE_NAME_CHARDEV_TEST_LARGEX,
            fallback_port_id, &largex_svc_id);
        if (rc != EOK) {
                printf("%s: Failed registering service.: %s\n", NAME, str_error(rc));
                goto error;
        }

        rc = loc_service_register(srv, SERVICE_NAME_CHARDEV_TEST_PARTIALX,
            fallback_port_id, &partialx_svc_id);
        if (rc != EOK) {
                printf("%s: Failed registering service.: %s\n", NAME, str_error(rc));
                goto error;
        }

        printf("%s: Accepting connections\n", NAME);
        task_retval(0);
        async_manager();

        /* Not reached */
        return 0;
error:
        if (smallx_svc_id != 0)
                loc_service_unregister(srv, smallx_svc_id);
        if (largex_svc_id != 0)
                loc_service_unregister(srv, largex_svc_id);
        if (partialx_svc_id != 0)
                loc_service_unregister(srv, partialx_svc_id);
        loc_server_unregister(srv);
        return rc;
}

static errno_t smallx_open(chardev_srvs_t *srvs, chardev_srv_t *srv)
{
        return EOK;
}

static errno_t smallx_close(chardev_srv_t *srv)
{
        return EOK;
}

static errno_t smallx_write(chardev_srv_t *srv, const void *data, size_t size,
    size_t *nwritten)
{
        if (size < 1) {
                *nwritten = 0;
                return EOK;
        }

        *nwritten = 1;
        return EOK;
}

static errno_t smallx_read(chardev_srv_t *srv, void *buf, size_t size,
    size_t *nread, chardev_flags_t flags)
{
        if (size < 1) {
                *nread = 0;
                return EOK;
        }

        memset(buf, 0, 1);
        *nread = 1;
        return EOK;
}

static errno_t largex_open(chardev_srvs_t *srvs, chardev_srv_t *srv)
{
        return EOK;
}

static errno_t largex_close(chardev_srv_t *srv)
{
        return EOK;
}

static errno_t largex_write(chardev_srv_t *srv, const void *data, size_t size,
    size_t *nwritten)
{
        if (size < 1) {
                *nwritten = 0;
                return EOK;
        }

        *nwritten = size;
        return EOK;
}

static errno_t largex_read(chardev_srv_t *srv, void *buf, size_t size,
    size_t *nread, chardev_flags_t flags)
{
        if (size < 1) {
                *nread = 0;
                return EOK;
        }

        memset(buf, 0, size);
        *nread = size;
        return EOK;
}

static errno_t partialx_open(chardev_srvs_t *srvs, chardev_srv_t *srv)
{
        return EOK;
}

static errno_t partialx_close(chardev_srv_t *srv)
{
        return EOK;
}

static errno_t partialx_write(chardev_srv_t *srv, const void *data, size_t size,
    size_t *nwritten)
{
        if (size < 1) {
                *nwritten = 0;
                return EOK;
        }

        *nwritten = 1;
        return EIO;
}

static errno_t partialx_read(chardev_srv_t *srv, void *buf, size_t size,
    size_t *nread, chardev_flags_t flags)
{
        if (size < 1) {
                *nread = 0;
                return EOK;
        }

        memset(buf, 0, 1);
        *nread = 1;
        return EIO;
}

/**
 * @}
 */