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 * Copyright (c) 2021-2021, 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
 * provided with the distribution.
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 * 3. Neither the name of the copyright holder nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific prior written
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "lt_net_netdb.h"
// 引入头文件，可能包含了网络数据库相关的函数声明和宏定义。

static int GetServByNameRTest(void)
{
    char serv_file[] = "ssh		22/tcp\n";
    // 定义一个模拟的services文件内容，包含ssh服务的条目。
    char *pathList[] = {"/etc/services"};
    // 定义services文件的路径列表，这里只有一个路径指向系统的services文件。
    char *streamList[] = {static_cast<char *>(serv_file)};
    // 定义模拟的services文件流列表，这里将模拟的services文件内容转换为char*类型。
    int streamLen[] = {sizeof(serv_file)};
    // 定义模拟的services文件流长度列表。
    const int file_number = 1;
    // 定义文件数量。
    int flag = PrepareFileEnv(pathList, streamList, streamLen, file_number);
    // 调用PrepareFileEnv函数准备文件环境，模拟services文件。
    if (flag != 0) {
        RecoveryFileEnv(pathList, file_number);
        return -1;
    }
    // 如果准备文件环境失败，则恢复原始文件环境并返回错误码。

    struct servent se;
    struct servent *result = NULL;
    char buf1[1024] = { 0 };
    char buf2[2] = { 0 };
    int ret;

    errno = 0;
    ret = getservbyname_r("ssh", "tcp", &se, buf1, sizeof buf1, &result);
    // 使用getservbyname_r函数根据服务名"ssh"和协议名"tcp"获取servent结构体指针。
    ICUNIT_ASSERT_EQUAL(ret, 0, ret);
    // 断言返回值ret为0，表示getservbyname_r函数调用成功。
    ICUNIT_ASSERT_NOT_EQUAL(result, NULL, -1);
    // 断言result不为空，即getservbyname_r成功。
    ICUNIT_ASSERT_STRING_EQUAL(se.s_name, "ssh", -1);
    // 断言返回的服务名称与"ssh"相同。
    ICUNIT_ASSERT_STRING_EQUAL(se.s_proto, "tcp", -1);
    // 断言返回的服务协议与"tcp"相同。
    ICUNIT_ASSERT_STRING_EQUAL(se.s_aliases[0], "ssh", -1);
    // 断言返回的服务别名与"ssh"相同。
    ICUNIT_ASSERT_STRING_EQUAL(result->s_name, "ssh", -1);
    // 断言result结构体中的服务名称与"ssh"相同。
    ICUNIT_ASSERT_STRING_EQUAL(result->s_proto, "tcp", -1);
    // 断言result结构体中的服务协议与"tcp"相同。
    ICUNIT_ASSERT_STRING_EQUAL(result->s_aliases[0], "ssh", -1);
    // 断言result结构体中的服务别名与"ssh"相同。

    ret = getservbyname_r("ssh", "tcp", &se, buf2, sizeof buf2, &result);
    // 测试getservbyname_r函数的边界条件，传入的缓冲区太小。
    ICUNIT_ASSERT_EQUAL(ret, ERANGE, ret);
    // 断言返回值ret为ERANGE，表示缓冲区太小。

    ret = getservbyname_r("ssh", "tp", &se, buf1, sizeof buf1, &result);
    // 尝试使用getservbyname_r函数根据服务名"ssh"和错误的协议名"tp"获取servent结构体指针，预期失败。
    ICUNIT_ASSERT_EQUAL(ret, EINVAL, ret);
    // 断言返回值ret为EINVAL，表示提供的协议名不合法。

    ret = getservbyname_r("sh", "tcp", &se, buf1, sizeof buf1, &result);
    // 尝试使用getservbyname_r函数根据不完整的服务名"sh"和协议名"tcp"获取servent结构体指针，预期失败。
    ICUNIT_ASSERT_EQUAL(ret, ENOENT, ret);
    // 断言返回值ret为ENOENT，表示未找到对应服务。

    RecoveryFileEnv(pathList, file_number);
    // 恢复原始文件环境。
    return ICUNIT_SUCCESS;
    // 返回测试成功。
}

void NetNetDbTest017(void)
{
    TEST_ADD_CASE(__FUNCTION__, GetServByNameRTest, TEST_POSIX, TEST_TCP, TEST_LEVEL0, TEST_FUNCTION);
}
// 定义测试用例，将GetServByNameRTest函数注册为一个测试案例。