udp_listen(port, laddr, lport, flags) u_int port; u_int32_t laddr; u_int lport; int flags; { struct sockaddr_in addr; struct socket *so; int addrlen = sizeof(struct sockaddr_in), opt = 1; if ((so = socreate()) == NULL) { free(so); return NULL; } so->s = socket(AF_INET,SOCK_DGRAM,0); so->so_expire = curtime + SO_EXPIRE; insque(so,&udb); addr.sin_family = AF_INET; addr.sin_addr.s_addr = INADDR_ANY; addr.sin_port = port; if (bind(so->s,(struct sockaddr *)&addr, addrlen) < 0) { udp_detach(so); return NULL; } setsockopt(so->s,SOL_SOCKET,SO_REUSEADDR,(char *)&opt,sizeof(int)); /* setsockopt(so->s,SOL_SOCKET,SO_OOBINLINE,(char *)&opt,sizeof(int)); */ getsockname(so->s,(struct sockaddr *)&addr,&addrlen); so->so_fport = addr.sin_port; if (addr.sin_addr.s_addr == 0 || addr.sin_addr.s_addr == loopback_addr.s_addr) so->so_faddr = alias_addr; else so->so_faddr = addr.sin_addr; so->so_lport = lport; so->so_laddr.s_addr = laddr; if (flags != SS_FACCEPTONCE) so->so_expire = 0; so->so_state = SS_ISFCONNECTED; return so; }