1#define _GNU_SOURCE
2#include <sys/socket.h>
3#include <errno.h>
4#include <fcntl.h>
5#include "syscall.h"
6#include "libc.h"
7
8int accept4(int fd, struct sockaddr *restrict addr, socklen_t *restrict len, int flg)
9{
10	if (!flg) return accept(fd, addr, len);
11	int ret = socketcall_cp(accept4, fd, addr, len, flg, 0, 0);
12	if (ret>=0 || (errno != ENOSYS && errno != EINVAL)) return ret;
13	ret = accept(fd, addr, len);
14	if (ret<0) return ret;
15	if (flg & SOCK_CLOEXEC)
16		__syscall(SYS_fcntl, ret, F_SETFD, FD_CLOEXEC);
17	if (flg & SOCK_NONBLOCK)
18		__syscall(SYS_fcntl, ret, F_SETFL, O_NONBLOCK);
19	return ret;
20}
21