It_ipc_pipe_003.cpp

/*
 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
 * Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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 * 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
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "it_test_signal.h"


static const int TAR_STR_LEN = 12;

static UINT32 Testcase(VOID)
{
    int pipeFd[2], ret, spid; // 2, pipe return 2 file descripter
    char buffer[20];          // 20, target buffer size
    ret = pipe(pipeFd);
    ICUNIT_GOTO_EQUAL(ret, 0, ret, EXIT1);
    spid = fork();
    ICUNIT_GOTO_NOT_EQUAL(spid, -1, spid, EXIT1);
    if (spid == 0) {
        close(pipeFd[0]);
        ret = write(pipeFd[1], "hello world", TAR_STR_LEN);
        printf("write first status: %d\n", ret);
        if (ret != TAR_STR_LEN) {
            exit(11); // 11, the value of son process unexpect exit, convenient to debug
        }
        close(pipeFd[1]);
        exit(RED_FLAG);
    }
    close(pipeFd[1]);
    sleep(2); // 2, sleep 2 second
    ret = read(pipeFd[0], buffer, TAR_STR_LEN);
    ICUNIT_GOTO_EQUAL(ret, TAR_STR_LEN, ret, EXIT);
    ret = strcmp(buffer, "hello world");
    ICUNIT_GOTO_EQUAL(ret, 0, ret, EXIT);
    printf("read pipe success: %s\n", buffer);
    wait(&ret);
    printf("son return status: %d\n", WEXITSTATUS(ret));
    ICUNIT_GOTO_EQUAL(WEXITSTATUS(ret), RED_FLAG, WEXITSTATUS(ret), EXIT);
    printf("pipe ok\n");
    close(pipeFd[0]);
    return LOS_OK;
EXIT:
    close(pipeFd[0]);
EXIT1:
    return LOS_NOK;
}

VOID ItIpcPipe003(void)
{
    TEST_ADD_CASE(__FUNCTION__, Testcase, TEST_LIB, TEST_LIBC, TEST_LEVEL1, TEST_FUNCTION);
}