如何创建socket类型的特殊文件？

Question

我需要为 kgdb-gdb 远程连接创建串行端口套接字。

正如mkfifo在您的系统上创建一个FIFO一样，我们如何创建套接字文件？

Answer 1

如果您尝试编写一个使用套接字的应用程序，@cidermonkey 接受的答案中的链接非常有用。如果你真的只是想创建一个，你可以用 python 来完成：

~]# python -c "import socket as s; sock = s.socket(s.AF_UNIX); sock.bind('/tmp/somesocket')"
~]# ll /tmp/somesocket 
srwxr-xr-x. 1 root root 0 Mar  3 19:30 /tmp/somesocket

或者使用一个小小的 C 程序，例如，将以下内容保存到create-a-socket.c：

#include <fcntl.h>
#include <sys/un.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

int main(int argc, char **argv)
{
    // The following line expects the socket path to be first argument
    char * mysocketpath = argv[1];
    // Alternatively, you could comment that and set it statically:
    //char * mysocketpath = "/tmp/mysock";
    struct sockaddr_un namesock;
    int fd;
    namesock.sun_family = AF_UNIX;
    strncpy(namesock.sun_path, (char *)mysocketpath, sizeof(namesock.sun_path));
    fd = socket(AF_UNIX, SOCK_DGRAM, 0);
    bind(fd, (struct sockaddr *) &namesock, sizeof(struct sockaddr_un));
    close(fd);
    return 0;
}

然后安装gcc，编译它，然后ta-da：

~]# gcc -o create-a-socket create-a-socket.c
~]# ./create-a-socket mysock
~]# ll mysock
srwxr-xr-x. 1 root root 0 Mar  3 17:45 mysock