c - 绑定(bind)在我的C程序中不起作用

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这是我编写的用于创建套接字并将其绑定到地址和端口的代码：

#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <strings.h>
#include <netdb.h>

int main(int argc, char *argv[])
{
    const char APPRESSMESSAGE[] = "APRESS,For Profesionals By Professional!\n";
    int SimpleSocket = 0;
    int SimplePort = 0;
    if (argc != 2)
    {
        fprintf(stderr, "USAGE: %s <port>\n", argv[0]);
        exit(1);
    }
    SimpleSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (SimpleSocket == -1)
    {
        fprintf(stderr, "Could not create the socket !\n");
        exit(2);
    }
    else
    {
        fprintf(stdout, "socket created\n");
    }
    SimplePort = atoi(argv[1]);
    struct sockaddr_in SimpleServer;
    bzero(&SimpleServer, sizeof(SimpleServer));
    SimpleServer.sin_family = AF_INET;
    SimpleServer.sin_addr.s_addr = htonl(INADDR_ANY);
    SimpleServer.sin_port = htons(SimplePort);
    int return_status;
    return_status = bind(SimpleSocket, (struct sockaddr *)&SimpleServer, sizeof(SimpleServer));
    if (return_status == 0)
    {
        fprintf(stdout, "bind completed\n");
    }
    else
    {
        fprintf(stderr, "could not bind to socket\n");
        close(SimpleSocket);
        exit(1);
    }
    return 0;
}

在这里，我期望输出为：

socket created
bind completed.

但是结果是“无法绑定到套接字”。
这可能是什么原因？

最佳答案

结果是“无法绑定到套接字”。这可能是什么原因？


从man bind引用（在Linux系统上），可能会出现一些错误（Unix套接字的错误更多，但这是一个TCP套接字）：

ERRORS
    EACCES The address is protected, and the user is not the superuser.

    EADDRINUSE
           The given address is already in use.

    EBADF  sockfd is not a valid descriptor.

    EINVAL The socket is already bound to an address.

    ENOTSOCK
           sockfd is a descriptor for a file, not a socket.

You could reduce the number of possibilities to investigate significantly by checking the value of errno, or by simply using a call to perror:

if (bind(SimpleSocket,(struct sockaddr *)&SimpleServer,sizeof(SimpleServer)) == 0) {
    fprintf(stdout,"bind completed\n");
}
else {
    perror("Could not bind to socket");
    close(SimpleSocket);
    exit(1);
}

关于c - 绑定(bind)在我的C程序中不起作用，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/31630363/