+int ustcomm_ustd_recv_message(struct ustcomm_ustd *ustd, char **msg, struct ustcomm_source *src, int timeout)
+{
+ return ustcomm_recv_message(&ustd->server, msg, src, timeout);
+}
+
+int ustcomm_app_recv_message(struct ustcomm_app *app, char **msg, struct ustcomm_source *src, int timeout)
+{
+ return ustcomm_recv_message(&app->server, msg, src, timeout);
+}
+
+/* This removes src from the list of active connections of app.
+ */
+
+int ustcomm_app_detach_client(struct ustcomm_app *app, struct ustcomm_source *src)
+{
+ struct ustcomm_server *server = (struct ustcomm_server *)app;
+ struct ustcomm_connection *conn;
+
+ list_for_each_entry(conn, &server->connections, list) {
+ if(conn->fd == src->fd) {
+ list_del(&conn->list);
+ goto found;
+ }
+ }
+
+ return -1;
+found:
+ return src->fd;
+}
+
+static int init_named_socket(char *name, char **path_out)
+{
+ int result;
+ int fd;
+
+ struct sockaddr_un addr;
+
+ result = fd = socket(PF_UNIX, SOCK_STREAM, 0);
+ if(result == -1) {
+ PERROR("socket");
+ return -1;
+ }
+
+ addr.sun_family = AF_UNIX;
+
+ strncpy(addr.sun_path, name, UNIX_PATH_MAX);
+ addr.sun_path[UNIX_PATH_MAX-1] = '\0';
+
+ result = access(name, F_OK);
+ if(result == 0) {
+ /* file exists */
+ result = unlink(name);
+ if(result == -1) {
+ PERROR("unlink of socket file");
+ goto close_sock;
+ }
+ WARN("socket already exists; overwriting");
+ }
+
+ result = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
+ if(result == -1) {
+ PERROR("bind");
+ goto close_sock;
+ }
+
+ result = listen(fd, 1);
+ if(result == -1) {
+ PERROR("listen");
+ goto close_sock;
+ }
+
+ if(path_out) {
+ *path_out = "";
+ *path_out = strdupa(addr.sun_path);
+ }
+
+ return fd;
+
+ close_sock:
+ close(fd);
+
+ return -1;
+}
+
+int ustcomm_init_app(pid_t pid, struct ustcomm_app *handle)
+{
+ int result;
+ char *name;
+
+ result = asprintf(&name, "%s/%d", SOCK_DIR, (int)pid);
+ if(result >= UNIX_PATH_MAX) {
+ ERR("string overflow allocating socket name");
+ return -1;
+ }
+
+ handle->server.listen_fd = init_named_socket(name, &(handle->server.socketpath));
+ if(handle->server.listen_fd < 0) {
+ ERR("error initializing named socket");
+ goto free_name;
+ }
+ free(name);
+
+ INIT_LIST_HEAD(&handle->server.connections);
+
+ return 0;
+
+free_name:
+ free(name);
+ return -1;
+}
+
+int ustcomm_init_ustd(struct ustcomm_ustd *handle)
+{
+ int result;
+ char *name;
+
+ result = asprintf(&name, "%s/%s", SOCK_DIR, "ustd");
+ if(result >= UNIX_PATH_MAX) {
+ ERR("string overflow allocating socket name");
+ return -1;
+ }
+
+ handle->server.listen_fd = init_named_socket(name, &handle->server.socketpath);
+ if(handle->server.listen_fd < 0) {
+ ERR("error initializing named socket");
+ goto free_name;
+ }
+ free(name);
+
+ INIT_LIST_HEAD(&handle->server.connections);
+
+ return 0;
+
+free_name:
+ free(name);
+ return -1;
+}
+
+static char *find_tok(char *str)
+{
+ while(*str == ' ') {
+ str++;
+
+ if(*str == 0)
+ return NULL;
+ }
+
+ return str;
+}
+
+static char *find_sep(char *str)
+{
+ while(*str != ' ') {
+ str++;
+
+ if(*str == 0)
+ break;
+ }
+
+ return str;
+}
+
+int nth_token_is(char *str, char *token, int tok_no)
+{
+ int i;
+ char *start;
+ char *end;
+
+ for(i=0; i<=tok_no; i++) {
+ str = find_tok(str);
+ if(str == NULL)
+ return -1;
+
+ start = str;
+
+ str = find_sep(str);
+ if(str == NULL)
+ return -1;
+
+ end = str;
+ }
+
+ if(end-start != strlen(token))
+ return 0;
+
+ if(strncmp(start, token, end-start))
+ return 0;
+
+ return 1;
+}
+
+char *nth_token(char *str, int tok_no)
+{
+ static char *retval = NULL;
+ int i;
+ char *start;
+ char *end;
+
+ for(i=0; i<=tok_no; i++) {
+ str = find_tok(str);
+ if(str == NULL)
+ return NULL;
+
+ start = str;
+
+ str = find_sep(str);
+ if(str == NULL)
+ return NULL;
+
+ end = str;
+ }
+
+ if(retval) {
+ free(retval);
+ retval = NULL;
+ }
+
+ asprintf(&retval, "%.*s", (int)(end-start), start);
+
+ return retval;
+}