1#define _GNU_SOURCE
2#include <sys/socket.h>
3#include <errno.h>
4#include <fcntl.h>
5#include "syscall.h"
6
7int accept4(int fd, struct sockaddr *restrict addr, socklen_t *restrict len, int flg)
8{
9 if (!flg) return accept(fd, addr, len);
10 int ret = socketcall_cp(accept4, fd, addr, len, flg, 0, 0);
11 if (ret>=0 || (errno != ENOSYS && errno != EINVAL)) return ret;
12 if (flg & ~(SOCK_CLOEXEC|SOCK_NONBLOCK)) {
13 errno = EINVAL;
14 return -1;
15 }
16 ret = accept(fd, addr, len);
17 if (ret<0) return ret;
18 if (flg & SOCK_CLOEXEC)
19 __syscall(SYS_fcntl, ret, F_SETFD, FD_CLOEXEC);
20 if (flg & SOCK_NONBLOCK)
21 __syscall(SYS_fcntl, ret, F_SETFL, O_NONBLOCK);
22 return ret;
23}