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 int do_dgram_socket_create(ClientData cd, Tcl_Interp *ip,
25 SockAddr_Value local, void **sock_r) {
28 const struct sockaddr *sa;
30 sa= sockaddr_addr(&local);
31 al= sockaddr_len(&local);
33 fd= socket(sa->sa_family, SOCK_DGRAM, 0);
34 if (fd<0) return posixerr(ip,errno,"socket");
35 r= bind(fd, sa, al); if (r) return newfdposixerr(ip,fd,"bind");
36 r= setnonblock(fd, 1); if (r) return newfdposixerr(ip,fd,"setnonblock");
38 sock= TALLOC(sizeof(DgramSocket));
41 sock->addr_buflen= al+1;
42 sock->addr_buf= TALLOC(sock->addr_buflen);
45 scriptinv_init(&sock->script);
51 int do_dgram_socket_transmit(ClientData cd, Tcl_Interp *ip,
52 void *sock_v, HBytes_Value data,
53 SockAddr_Value remote) {
54 DgramSocket *sock= sock_v;
58 hbytes_data(&data), l=hbytes_len(&data),
60 sockaddr_addr(&remote), sockaddr_len(&remote));
61 if (r==-1) return posixerr(ip,errno,"sendto");
62 else if (r!=l) return staticerr(ip,"sendto gave wrong answer",0);
66 static void cancel(DgramSocket *sock) {
67 if (sock->script.obj) {
68 scriptinv_cancel(&sock->script);
69 Tcl_DeleteFileHandler(sock->fd);
73 static void recv_call(ClientData sock_cd, int mask) {
74 DgramSocket *sock= (void*)sock_cd;
75 Tcl_Interp *ip= sock->script.ip;
77 HBytes_Value message_val;
78 SockAddr_Value peer_val;
83 hbytes_empty(&message_val);
84 sockaddr_clear(&peer_val);
95 mh.msg_name= sock->addr_buf;
96 mh.msg_namelen= sock->addr_buflen;
98 iov.iov_base= sock->msg_buf;
99 iov.iov_len= sock->msg_buflen;
101 sz= recvmsg(sock->fd, &mh, peek);
103 if (errno == EAGAIN || errno == EWOULDBLOCK) rc=0;
104 else rc= posixerr(ip,errno,"recvmsg");
108 assert(mh.msg_namelen < sock->addr_buflen);
110 if (!(mh.msg_flags & MSG_TRUNC)) {
116 TFREE(sock->msg_buf);
117 sock->msg_buflen *= 2;
118 sock->msg_buflen += 100;
119 sock->msg_buf= TALLOC(sock->msg_buflen);
122 hbytes_array(&message_val, iov.iov_base, sz);
123 sockaddr_create(&peer_val, mh.msg_name, mh.msg_namelen);
125 args[0]= ret_hb(ip, message_val); hbytes_empty(&message_val);
126 args[1]= ret_sockaddr(ip, peer_val); sockaddr_clear(&peer_val);
127 args[2]= ret_iddata(ip, sock, &dgram_socks);
128 scriptinv_invoke(&sock->script,3,args);
134 Tcl_BackgroundError(ip);
137 int do_dgram_socket_on_receive(ClientData cd, Tcl_Interp *ip,
138 void *sock_v, Tcl_Obj *newscript) {
139 DgramSocket *sock= sock_v;
145 rc= scriptinv_set(&sock->script, ip, newscript, 0);
149 Tcl_CreateFileHandler(sock->fd, TCL_READABLE, recv_call, sock);
153 static void destroy(DgramSocket *sock) {
155 close(sock->fd); /* nothing useful to be done with errors */
156 TFREE(sock->addr_buf);
157 TFREE(sock->msg_buf);
161 static void destroy_idtabcb(Tcl_Interp *ip, void *sock_v) {
165 int do_dgram_socket_close(ClientData cd, Tcl_Interp *ip, void *sock_v) {
166 tabledataid_disposing(ip,sock_v,&dgram_socks);
171 const IdDataSpec dgram_socks= {
172 "dgramsock", "dgramsock-table", destroy_idtabcb