4 * dgram-socket create <local> => <sockid>
5 * dgram-socket close <sockid>
6 * dgram-socket transmit <sockid> <data> <remote>
7 * dgram-socket on-receive <sockid> [<script>]
8 * calls, effectively, eval <script> [list <data> <remote-addr> <socket>]
9 * if script not supplied, cancel
15 typedef struct DgramSocket {
19 ScriptToInvoke script;
20 void *addr_buf, *msg_buf;
21 int addr_buflen, msg_buflen;
24 IdDataTable dgram_socks= { "dgramsock" };
26 int do_dgram_socket_create(ClientData cd, Tcl_Interp *ip,
27 SockAddr_Value local, void **sock_r) {
30 const struct sockaddr *sa;
32 sa= sockaddr_addr(&local);
33 al= sockaddr_len(&local);
35 fd= socket(sa->sa_family, SOCK_DGRAM, 0);
36 if (fd<0) return posixerr(ip,errno,"socket");
37 r= bind(fd, sa, al); if (r) return newfdposixerr(ip,fd,"bind");
38 r= setnonblock(fd, 1); if (r) return newfdposixerr(ip,fd,"setnonblock");
40 sock= TALLOC(sizeof(DgramSocket));
43 sock->addr_buflen= al+1;
44 sock->addr_buf= TALLOC(sock->addr_buflen);
47 scriptinv_init(&sock->script);
53 int do_dgram_socket_transmit(ClientData cd, Tcl_Interp *ip,
54 void *sock_v, HBytes_Value data,
55 SockAddr_Value remote) {
56 DgramSocket *sock= sock_v;
60 hbytes_data(&data), l=hbytes_len(&data),
62 sockaddr_addr(&remote), sockaddr_len(&remote));
63 if (r==-1) return posixerr(ip,errno,"sendto");
64 else if (r!=l) return staticerr(ip,"sendto gave wrong answer",0);
68 static void cancel(DgramSocket *sock) {
69 if (sock->script.obj) {
70 scriptinv_cancel(&sock->script);
71 Tcl_DeleteFileHandler(sock->fd);
75 static void recv_call(ClientData sock_cd, int mask) {
76 DgramSocket *sock= (void*)sock_cd;
77 Tcl_Interp *ip= sock->script.ip;
79 HBytes_Value message_val;
80 SockAddr_Value peer_val;
85 hbytes_empty(&message_val);
86 sockaddr_clear(&peer_val);
97 mh.msg_name= sock->addr_buf;
98 mh.msg_namelen= sock->addr_buflen;
100 iov.iov_base= sock->msg_buf;
101 iov.iov_len= sock->msg_buflen;
103 sz= recvmsg(sock->fd, &mh, peek);
105 if (errno == EAGAIN || errno == EWOULDBLOCK) rc=0;
106 else rc= posixerr(ip,errno,"recvmsg");
110 assert(mh.msg_namelen < sock->addr_buflen);
112 if (!(mh.msg_flags & MSG_TRUNC)) {
118 TFREE(sock->msg_buf);
119 sock->msg_buflen *= 2;
120 sock->msg_buflen += 100;
121 sock->msg_buf= TALLOC(sock->msg_buflen);
124 hbytes_array(&message_val, iov.iov_base, sz);
125 sockaddr_create(&peer_val, mh.msg_name, mh.msg_namelen);
127 args[0]= ret_hb(ip, message_val); hbytes_empty(&message_val);
128 args[1]= ret_sockaddr(ip, peer_val); sockaddr_clear(&peer_val);
129 args[2]= ret_iddata(ip, sock, &dgram_socks);
130 scriptinv_invoke(&sock->script,3,args);
136 Tcl_BackgroundError(ip);
139 int do_dgram_socket_on_receive(ClientData cd, Tcl_Interp *ip,
140 void *sock_v, Tcl_Obj *newscript) {
141 DgramSocket *sock= sock_v;
147 rc= scriptinv_set(&sock->script, ip, newscript);
151 Tcl_CreateFileHandler(sock->fd, TCL_READABLE, recv_call, sock);
155 int do_dgram_socket_close(ClientData cd, Tcl_Interp *ip, void *sock_v) {
156 DgramSocket *sock= sock_v;
159 close(sock->fd); /* nothing useful to be done with errors */
161 TFREE(sock->addr_buf);
162 TFREE(sock->msg_buf);
164 dgram_socks.a[sockix]= 0;