Access the child connection file descriptor

[smuellerDD]

When a new connection is made, the accept() system call returns a file descriptor that is used to perform all subsequent communication for a given session.

That FD is maintained in:

struct _ServerConnection
{
  int fd;
...

Now, this structure is private and thus no advertised API.

However, I would like to access this FD as I would like to use it to use it with getsockopt().

Currently I have to copy the structure definitions of struct _ServerConnection and struct _ServerRequest into my code and resolve it using the closure data as follows:

int func(void *closure_data)
{
        ServerRequest *server_request = closure_data;
        ServerConnection *conn = server_request->conn;
        struct ucred cred;
        socklen_t len = sizeof(cred);

        if (getsockopt(conn->fd, SOL_SOCKET, SO_PEERCRED, &cred, &len) < 0)
...

This is a hack that I would like to avoid. Is there a way to access the FD using the API? If not, I would be willing to write a patch. But I am not sure how such a patch would look like as there are 2 options:

• make the FD available, i.e. return the FD number

• provide wrapper API calls around getsockopt (e.g. one API call to obtain SO_PEERCRED, one for another call).

I would lean towards the first option.

[fyfyp1234]

邮件已收  谢谢