Question

我遇到了C套接字问题。我Segmentation fault: 11函数recv(int socket, void *buffer, size_t length, int flags);。我在连接功能中打印了服务器ip。这应该意味着，该套接字已正确初始化。

使用函数recv的函数：

int receive_packet(SOCKET *socket, char *packet)
{
    int bytes;
    char data_buffer [2000] = {0};

    bytes = recv(*socket, data_buffer, sizeof(data_buffer), 0);

    if (bytes == 0)
    {
        return 0;
    }

    else if (bytes == SOCKET_ERROR)
    {
        printf("Error: failed to receive packet\n");

        return SOCKET_ERROR;
    }

    else
    {
        memset (packet, 0, bytes);

        strcpy (packet, data_buffer);

        return bytes;
    }
}

主要功能在哪里调用函数recv：

int main(int argc, char *argv[])
{
    SOCKET command_socket;
    int port;
    char *host;
    char *username;
    char *password;
    char *packet = NULL;

    host = argv[1];
    port = atoi(argv[2]);
    username = argv[3];
    password = argv[4];

    printf("BEFORE: %d\n", command_socket);

    command_socket = connect_to_server(host, port);

    printf("AFTER: %d\n", command_socket);

    receive_packet(&command_socket, packet);

    printf("Packet: %s\n", packet);

    return 0;
}

输出：

BEFORE: 0
Connected successfully.
AFTER: 3
Segmentation fault: 11

任何想法为什么？！

P.S。我的基于UNIX的操作系统是OS X.

Answer 1

据我所知，SOCKET应该是int类型来表示文件描述符。并且你必须向receive_packet传递一个NULL，当解除引用该指针时，你得到了段falut，这是我能想到为什么你在recv中得到一个段falut的唯一原因。

关于recv（）函数的C分段错误11

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