c - SO_KEEPALIVE and poll -

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hello try use following code, seems not working, on connected socket (sock) do: 

struct pollfd input_fd;  int a=1;  setsockopt(sock,sol_socket,so_keepalive,&a,sizeof(a));  a=1;  setsockopt(sock,sol_tcp,tcp_keepidle,&a,sizeof(a));  a=1;  setsockopt(sock,sol_tcp,tcp_keepintvl,&a,sizeof(a));  a=1;  setsockopt(sock,sol_tcp,tcp_keepcnt,&a,sizeof(a));  input_fd.fd = sock;  input_fd.events = pollin | pollout;  input_fd.revents = 0;  int p=poll(&input_fd, 1,-1);

i pull lan plug remote computer, nothing happens. kernel seems sleeping in poll syscall. desired behaviour, or defect?

set nfds:

int p=poll(&input_fd, sock+1 ,-1);

also, i'm not sure of allowed range of settings, it's worth check return value of setsockopt.


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