Feature/Fix some error in syscall fcntl and getsockopt

[owl129]

Fix syscall fcntl

int fcntl(int fd, int cmd, ... /* arg */ );

when call syscall fcntl with cmd F_SETFL, file descriptor in args was set, Which need mapping FIRST to support different OS/Arch.

Feature add to getsockopt

Add level IPPROTO_TCP support for syscall getsockopt

Also fix exception handle in getsockopt

Implements poll syscall

https://man7.org/linux/man-pages/man2/poll.2.html

#include <poll.h>

int poll(struct pollfd *fds, nfds_t nfds, int timeout);

pollfd params struct

struct pollfd {
   int   fd;         /* file descriptor */
   short events;     /* requested events */
   short revents;    /* returned events */
};

[xwings]

Hi @owl129 there is a conflict based on the recent merge. can you please fix it ?

[owl129]

@xwings can u help review this request？

[xwings]

Cool and Thanks!