diff options
Diffstat (limited to 'cups/main.c')
| -rw-r--r-- | cups/main.c | 876 |
1 files changed, 876 insertions, 0 deletions
diff --git a/cups/main.c b/cups/main.c new file mode 100644 index 0000000..7f3f4b0 --- /dev/null +++ b/cups/main.c @@ -0,0 +1,876 @@ +/* + * + * BlueZ - Bluetooth protocol stack for Linux + * + * Copyright (C) 2003-2010 Marcel Holtmann <marcel@holtmann.org> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdio.h> +#include <errno.h> +#include <fcntl.h> +#include <unistd.h> +#include <stdlib.h> +#include <string.h> +#include <signal.h> +#include <sys/socket.h> +#include <glib.h> + +#include <bluetooth/bluetooth.h> +#include <bluetooth/sdp.h> +#include <bluetooth/sdp_lib.h> + +#include <gdbus.h> + +#include "cups.h" + +struct cups_device { + char *bdaddr; + char *name; + char *id; +}; + +static GSList *device_list = NULL; +static GMainLoop *loop = NULL; +static DBusConnection *conn = NULL; +static gboolean doing_disco = FALSE; + +#define ATTRID_1284ID 0x0300 + +struct context_data { + gboolean found; + char *id; +}; + +static void element_start(GMarkupParseContext *context, + const gchar *element_name, + const gchar **attribute_names, + const gchar **attribute_values, + gpointer user_data, GError **err) +{ + struct context_data *ctx_data = user_data; + + if (!strcmp(element_name, "record")) + return; + + if (!strcmp(element_name, "attribute")) { + int i; + for (i = 0; attribute_names[i]; i++) { + if (strcmp(attribute_names[i], "id") != 0) + continue; + if (strtol(attribute_values[i], 0, 0) == ATTRID_1284ID) + ctx_data->found = TRUE; + break; + } + return; + } + + if (ctx_data->found && !strcmp(element_name, "text")) { + int i; + for (i = 0; attribute_names[i]; i++) { + if (!strcmp(attribute_names[i], "value")) { + ctx_data->id = g_strdup(attribute_values[i] + 2); + ctx_data->found = FALSE; + } + } + } +} + +static GMarkupParser parser = { + element_start, NULL, NULL, NULL, NULL +}; + +static char *sdp_xml_parse_record(const char *data) +{ + GMarkupParseContext *ctx; + struct context_data ctx_data; + int size; + + size = strlen(data); + ctx_data.found = FALSE; + ctx_data.id = NULL; + ctx = g_markup_parse_context_new(&parser, 0, &ctx_data, NULL); + + if (g_markup_parse_context_parse(ctx, data, size, NULL) == FALSE) { + g_markup_parse_context_free(ctx); + g_free(ctx_data.id); + return NULL; + } + + g_markup_parse_context_free(ctx); + + return ctx_data.id; +} + +static char *device_get_ieee1284_id(const char *adapter, const char *device) +{ + DBusMessage *message, *reply; + DBusMessageIter iter, reply_iter; + DBusMessageIter reply_iter_entry; + const char *hcr_print = "00001126-0000-1000-8000-00805f9b34fb"; + const char *xml; + char *id = NULL; + + /* Look for the service handle of the HCRP service */ + message = dbus_message_new_method_call("org.bluez", device, + "org.bluez.Device", + "DiscoverServices"); + dbus_message_iter_init_append(message, &iter); + dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &hcr_print); + + reply = dbus_connection_send_with_reply_and_block(conn, + message, -1, NULL); + + dbus_message_unref(message); + + if (!reply) + return NULL; + + dbus_message_iter_init(reply, &reply_iter); + + if (dbus_message_iter_get_arg_type(&reply_iter) != DBUS_TYPE_ARRAY) { + dbus_message_unref(reply); + return NULL; + } + + dbus_message_iter_recurse(&reply_iter, &reply_iter_entry); + + /* Hopefully we only get one handle, or take a punt */ + while (dbus_message_iter_get_arg_type(&reply_iter_entry) == + DBUS_TYPE_DICT_ENTRY) { + guint32 key; + DBusMessageIter dict_entry; + + dbus_message_iter_recurse(&reply_iter_entry, &dict_entry); + + /* Key ? */ + dbus_message_iter_get_basic(&dict_entry, &key); + if (!key) { + dbus_message_iter_next(&reply_iter_entry); + continue; + } + + /* Try to get the value */ + if (!dbus_message_iter_next(&dict_entry)) { + dbus_message_iter_next(&reply_iter_entry); + continue; + } + + dbus_message_iter_get_basic(&dict_entry, &xml); + + id = sdp_xml_parse_record(xml); + if (id != NULL) + break; + dbus_message_iter_next(&reply_iter_entry); + } + + dbus_message_unref(reply); + + return id; +} + +static void print_printer_details(const char *name, const char *bdaddr, + const char *id) +{ + char *uri, *escaped; + + escaped = g_strdelimit(g_strdup(name), "\"", '\''); + uri = g_strdup_printf("bluetooth://%c%c%c%c%c%c%c%c%c%c%c%c", + bdaddr[0], bdaddr[1], + bdaddr[3], bdaddr[4], + bdaddr[6], bdaddr[7], + bdaddr[9], bdaddr[10], + bdaddr[12], bdaddr[13], + bdaddr[15], bdaddr[16]); + printf("direct %s \"%s\" \"%s (Bluetooth)\"", uri, escaped, escaped); + if (id != NULL) + printf(" \"%s\"\n", id); + else + printf("\n"); + g_free(escaped); + g_free(uri); +} + +static void add_device_to_list(const char *name, const char *bdaddr, + const char *id) +{ + struct cups_device *device; + GSList *l; + + /* Look for the device in the list */ + for (l = device_list; l != NULL; l = l->next) { + device = (struct cups_device *) l->data; + + if (strcmp(device->bdaddr, bdaddr) == 0) { + if (device->name != name) { + g_free(device->name); + device->name = g_strdup(name); + } + g_free(device->id); + device->id = g_strdup(id); + return; + } + } + + /* Or add it to the list if it's not there */ + device = g_new0(struct cups_device, 1); + device->bdaddr = g_strdup(bdaddr); + device->name = g_strdup(name); + device->id = g_strdup(id); + + device_list = g_slist_prepend(device_list, device); + print_printer_details(device->name, device->bdaddr, device->id); +} + +static gboolean parse_device_properties(DBusMessageIter *reply_iter, + char **name, char **bdaddr) +{ + guint32 class = 0; + DBusMessageIter reply_iter_entry; + + if (dbus_message_iter_get_arg_type(reply_iter) != DBUS_TYPE_ARRAY) + return FALSE; + + dbus_message_iter_recurse(reply_iter, &reply_iter_entry); + + while (dbus_message_iter_get_arg_type(&reply_iter_entry) == + DBUS_TYPE_DICT_ENTRY) { + const char *key; + DBusMessageIter dict_entry, iter_dict_val; + + dbus_message_iter_recurse(&reply_iter_entry, &dict_entry); + + /* Key == Class ? */ + dbus_message_iter_get_basic(&dict_entry, &key); + if (!key) { + dbus_message_iter_next(&reply_iter_entry); + continue; + } + + if (strcmp(key, "Class") != 0 && + strcmp(key, "Alias") != 0 && + strcmp(key, "Address") != 0) { + dbus_message_iter_next(&reply_iter_entry); + continue; + } + + /* Try to get the value */ + if (!dbus_message_iter_next(&dict_entry)) { + dbus_message_iter_next(&reply_iter_entry); + continue; + } + dbus_message_iter_recurse(&dict_entry, &iter_dict_val); + if (strcmp(key, "Class") == 0) { + dbus_message_iter_get_basic(&iter_dict_val, &class); + } else { + const char *value; + dbus_message_iter_get_basic(&iter_dict_val, &value); + if (strcmp(key, "Alias") == 0) { + *name = g_strdup(value); + } else if (bdaddr) { + *bdaddr = g_strdup(value); + } + } + dbus_message_iter_next(&reply_iter_entry); + } + + if (class == 0) + return FALSE; + if (((class & 0x1f00) >> 8) == 0x06 && (class & 0x80)) + return TRUE; + + return FALSE; +} + +static gboolean device_is_printer(const char *adapter, const char *device_path, char **name, char **bdaddr) +{ + DBusMessage *message, *reply; + DBusMessageIter reply_iter; + gboolean retval; + + message = dbus_message_new_method_call("org.bluez", device_path, + "org.bluez.Device", + "GetProperties"); + + reply = dbus_connection_send_with_reply_and_block(conn, + message, -1, NULL); + + dbus_message_unref(message); + + if (!reply) + return FALSE; + + dbus_message_iter_init(reply, &reply_iter); + + retval = parse_device_properties(&reply_iter, name, bdaddr); + + dbus_message_unref(reply); + + return retval; +} + +static void remote_device_found(const char *adapter, const char *bdaddr, + const char *name) +{ + DBusMessage *message, *reply, *adapter_reply; + DBusMessageIter iter; + char *object_path = NULL; + char *id; + + adapter_reply = NULL; + + if (adapter == NULL) { + message = dbus_message_new_method_call("org.bluez", "/", + "org.bluez.Manager", + "DefaultAdapter"); + + adapter_reply = dbus_connection_send_with_reply_and_block(conn, + message, -1, NULL); + + dbus_message_unref(message); + + if (dbus_message_get_args(adapter_reply, NULL, + DBUS_TYPE_OBJECT_PATH, &adapter, + DBUS_TYPE_INVALID) == FALSE) + return; + } + + message = dbus_message_new_method_call("org.bluez", adapter, + "org.bluez.Adapter", + "FindDevice"); + dbus_message_iter_init_append(message, &iter); + dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &bdaddr); + + if (adapter_reply != NULL) + dbus_message_unref(adapter_reply); + + reply = dbus_connection_send_with_reply_and_block(conn, + message, -1, NULL); + + dbus_message_unref(message); + + if (!reply) { + message = dbus_message_new_method_call("org.bluez", adapter, + "org.bluez.Adapter", + "CreateDevice"); + dbus_message_iter_init_append(message, &iter); + dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &bdaddr); + + reply = dbus_connection_send_with_reply_and_block(conn, + message, -1, NULL); + + dbus_message_unref(message); + + if (!reply) + return; + } + + if (dbus_message_get_args(reply, NULL, + DBUS_TYPE_OBJECT_PATH, &object_path, + DBUS_TYPE_INVALID) == FALSE) + return; + + id = device_get_ieee1284_id(adapter, object_path); + add_device_to_list(name, bdaddr, id); + g_free(id); +} + +static void discovery_completed(void) +{ + g_slist_free(device_list); + device_list = NULL; + + g_main_loop_quit(loop); +} + +static void remote_device_disappeared(const char *bdaddr) +{ + GSList *l; + + for (l = device_list; l != NULL; l = l->next) { + struct cups_device *device = l->data; + + if (strcmp(device->bdaddr, bdaddr) == 0) { + g_free(device->name); + g_free(device->bdaddr); + g_free(device); + device_list = g_slist_delete_link(device_list, l); + return; + } + } +} + +static gboolean list_known_printers(const char *adapter) +{ + DBusMessageIter reply_iter, iter_array; + DBusError error; + DBusMessage *message, *reply; + + message = dbus_message_new_method_call("org.bluez", adapter, + "org.bluez.Adapter", + "ListDevices"); + if (message == NULL) + return FALSE; + + dbus_error_init(&error); + reply = dbus_connection_send_with_reply_and_block(conn, message, + -1, &error); + + dbus_message_unref(message); + + if (dbus_error_is_set(&error)) + return FALSE; + + dbus_message_iter_init(reply, &reply_iter); + if (dbus_message_iter_get_arg_type(&reply_iter) != DBUS_TYPE_ARRAY) { + dbus_message_unref(reply); + return FALSE; + } + + dbus_message_iter_recurse(&reply_iter, &iter_array); + while (dbus_message_iter_get_arg_type(&iter_array) == + DBUS_TYPE_OBJECT_PATH) { + const char *object_path; + char *name = NULL; + char *bdaddr = NULL; + + dbus_message_iter_get_basic(&iter_array, &object_path); + if (device_is_printer(adapter, object_path, &name, &bdaddr)) { + char *id; + + id = device_get_ieee1284_id(adapter, object_path); + add_device_to_list(name, bdaddr, id); + g_free(id); + } + g_free(name); + g_free(bdaddr); + dbus_message_iter_next(&iter_array); + } + + dbus_message_unref(reply); + + return FALSE; +} + +static DBusHandlerResult filter_func(DBusConnection *connection, + DBusMessage *message, void *user_data) +{ + if (dbus_message_is_signal(message, "org.bluez.Adapter", + "DeviceFound")) { + const char *adapter, *bdaddr; + char *name; + DBusMessageIter iter; + + dbus_message_iter_init(message, &iter); + dbus_message_iter_get_basic(&iter, &bdaddr); + dbus_message_iter_next(&iter); + + adapter = dbus_message_get_path(message); + if (parse_device_properties(&iter, &name, NULL)) + remote_device_found(adapter, bdaddr, name); + g_free (name); + } else if (dbus_message_is_signal(message, "org.bluez.Adapter", + "DeviceDisappeared")) { + const char *bdaddr; + + dbus_message_get_args(message, NULL, + DBUS_TYPE_STRING, &bdaddr, + DBUS_TYPE_INVALID); + remote_device_disappeared(bdaddr); + } else if (dbus_message_is_signal(message, "org.bluez.Adapter", + "PropertyChanged")) { + DBusMessageIter iter, value_iter; + const char *name; + gboolean discovering; + + dbus_message_iter_init(message, &iter); + dbus_message_iter_get_basic(&iter, &name); + if (name == NULL || strcmp(name, "Discovering") != 0) + return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; + dbus_message_iter_next(&iter); + dbus_message_iter_recurse(&iter, &value_iter); + dbus_message_iter_get_basic(&value_iter, &discovering); + + if (discovering == FALSE && doing_disco) { + doing_disco = FALSE; + discovery_completed(); + } + } + + return DBUS_HANDLER_RESULT_NOT_YET_HANDLED; +} + +static gboolean list_printers(void) +{ + /* 1. Connect to the bus + * 2. Get the manager + * 3. Get the default adapter + * 4. Get a list of devices + * 5. Get the class of each device + * 6. Print the details from each printer device + */ + DBusError error; + dbus_bool_t hcid_exists; + DBusMessage *reply, *message; + DBusMessageIter reply_iter; + char *adapter, *match; + + conn = g_dbus_setup_bus(DBUS_BUS_SYSTEM, NULL, NULL); + if (conn == NULL) + return TRUE; + + dbus_error_init(&error); + hcid_exists = dbus_bus_name_has_owner(conn, "org.bluez", &error); + if (dbus_error_is_set(&error)) + return TRUE; + + if (!hcid_exists) + return TRUE; + + /* Get the default adapter */ + message = dbus_message_new_method_call("org.bluez", "/", + "org.bluez.Manager", + "DefaultAdapter"); + if (message == NULL) { + dbus_connection_unref(conn); + return FALSE; + } + + reply = dbus_connection_send_with_reply_and_block(conn, + message, -1, &error); + + dbus_message_unref(message); + + if (dbus_error_is_set(&error)) { + dbus_connection_unref(conn); + /* No adapter */ + return TRUE; + } + + dbus_message_iter_init(reply, &reply_iter); + if (dbus_message_iter_get_arg_type(&reply_iter) != + DBUS_TYPE_OBJECT_PATH) { + dbus_message_unref(reply); + dbus_connection_unref(conn); + return FALSE; + } + + dbus_message_iter_get_basic(&reply_iter, &adapter); + adapter = g_strdup(adapter); + dbus_message_unref(reply); + + if (!dbus_connection_add_filter(conn, filter_func, adapter, g_free)) { + g_free(adapter); + dbus_connection_unref(conn); + return FALSE; + } + +#define MATCH_FORMAT \ + "type='signal'," \ + "interface='org.bluez.Adapter'," \ + "sender='org.bluez'," \ + "path='%s'" + + match = g_strdup_printf(MATCH_FORMAT, adapter); + dbus_bus_add_match(conn, match, &error); + g_free(match); + + /* Add the the recent devices */ + list_known_printers(adapter); + + doing_disco = TRUE; + message = dbus_message_new_method_call("org.bluez", adapter, + "org.bluez.Adapter", + "StartDiscovery"); + + if (!dbus_connection_send_with_reply(conn, message, NULL, -1)) { + dbus_message_unref(message); + dbus_connection_unref(conn); + g_free(adapter); + return FALSE; + } + dbus_message_unref(message); + + loop = g_main_loop_new(NULL, TRUE); + g_main_loop_run(loop); + + g_free(adapter); + dbus_connection_unref(conn); + + return TRUE; +} + +static gboolean print_ieee1284(const char *bdaddr) +{ + DBusMessage *message, *reply, *adapter_reply; + DBusMessageIter iter; + char *object_path = NULL; + char *adapter; + char *id; + + adapter_reply = NULL; + + conn = g_dbus_setup_bus(DBUS_BUS_SYSTEM, NULL, NULL); + if (conn == NULL) + return FALSE; + + message = dbus_message_new_method_call("org.bluez", "/", + "org.bluez.Manager", + "DefaultAdapter"); + + adapter_reply = dbus_connection_send_with_reply_and_block(conn, + message, -1, NULL); + + dbus_message_unref(message); + + if (dbus_message_get_args(adapter_reply, NULL, + DBUS_TYPE_OBJECT_PATH, &adapter, + DBUS_TYPE_INVALID) == FALSE) + return FALSE; + + message = dbus_message_new_method_call("org.bluez", adapter, + "org.bluez.Adapter", + "FindDevice"); + dbus_message_iter_init_append(message, &iter); + dbus_message_iter_append_basic(&iter, DBUS_TYPE_STRING, &bdaddr); + + if (adapter_reply != NULL) + dbus_message_unref(adapter_reply); + + reply = dbus_connection_send_with_reply_and_block(conn, + message, -1, NULL); + + dbus_message_unref(message); + + if (!reply) { + message = dbus_message_new_method_call("org.bluez", adapter, + "org.bluez.Adapter", + "CreateDevice"); + dbus_message_iter_init_append(message, &iter); + dbus_message_iter_append_basic(&iter, + DBUS_TYPE_STRING, &bdaddr); + + reply = dbus_connection_send_with_reply_and_block(conn, + message, -1, NULL); + + dbus_message_unref(message); + + if (!reply) + return FALSE; + } + + if (dbus_message_get_args(reply, NULL, + DBUS_TYPE_OBJECT_PATH, &object_path, + DBUS_TYPE_INVALID) == FALSE) + return FALSE; + + id = device_get_ieee1284_id(adapter, object_path); + if (id == NULL) + return FALSE; + printf("%s", id); + g_free(id); + + return TRUE; +} + +/* + * Usage: printer-uri job-id user title copies options [file] + * + */ + +int main(int argc, char *argv[]) +{ + sdp_session_t *sdp; + bdaddr_t bdaddr; + unsigned short ctrl_psm, data_psm; + uint8_t channel, b[6]; + char *ptr, str[3], device[18], service[12]; + const char *uri, *cups_class; + int i, err, fd, copies, proto; + + /* Make sure status messages are not buffered */ + setbuf(stderr, NULL); + + /* Make sure output is not buffered */ + setbuf(stdout, NULL); + + /* Ignore SIGPIPE signals */ +#ifdef HAVE_SIGSET + sigset(SIGPIPE, SIG_IGN); +#elif defined(HAVE_SIGACTION) + memset(&action, 0, sizeof(action)); + action.sa_handler = SIG_IGN; + sigaction(SIGPIPE, &action, NULL); +#else + signal(SIGPIPE, SIG_IGN); +#endif /* HAVE_SIGSET */ + + if (argc == 1) { + if (list_printers() == TRUE) + return CUPS_BACKEND_OK; + else + return CUPS_BACKEND_FAILED; + } else if (argc == 3 && strcmp(argv[1], "--get-deviceid") == 0) { + if (bachk(argv[2]) < 0) { + fprintf(stderr, "Invalid Bluetooth address '%s'\n", + argv[2]); + return CUPS_BACKEND_FAILED; + } + if (print_ieee1284(argv[2]) == FALSE) + return CUPS_BACKEND_FAILED; + return CUPS_BACKEND_OK; + } + + if (argc < 6 || argc > 7) { + fprintf(stderr, "Usage: bluetooth job-id user title copies" + " options [file]\n"); + fprintf(stderr, " bluetooth --get-deviceid [bdaddr]\n"); + return CUPS_BACKEND_FAILED; + } + + if (argc == 6) { + fd = 0; + copies = 1; + } else { + if ((fd = open(argv[6], O_RDONLY)) < 0) { + perror("ERROR: Unable to open print file"); + return CUPS_BACKEND_FAILED; + } + copies = atoi(argv[4]); + } + + uri = getenv("DEVICE_URI"); + if (!uri) + uri = argv[0]; + + if (strncasecmp(uri, "bluetooth://", 12)) { + fprintf(stderr, "ERROR: No device URI found\n"); + return CUPS_BACKEND_FAILED; + } + + ptr = argv[0] + 12; + for (i = 0; i < 6; i++) { + strncpy(str, ptr, 2); + b[i] = (uint8_t) strtol(str, NULL, 16); + ptr += 2; + } + sprintf(device, "%2.2X:%2.2X:%2.2X:%2.2X:%2.2X:%2.2X", + b[0], b[1], b[2], b[3], b[4], b[5]); + + str2ba(device, &bdaddr); + + ptr = strchr(ptr, '/'); + if (ptr) { + strncpy(service, ptr + 1, 12); + + if (!strncasecmp(ptr + 1, "spp", 3)) + proto = 1; + else if (!strncasecmp(ptr + 1, "hcrp", 4)) + proto = 2; + else + proto = 0; + } else { + strcpy(service, "auto"); + proto = 0; + } + + cups_class = getenv("CLASS"); + + fprintf(stderr, + "DEBUG: %s device %s service %s fd %d copies %d class %s\n", + argv[0], device, service, fd, copies, + cups_class ? cups_class : "(none)"); + + fputs("STATE: +connecting-to-device\n", stderr); + +service_search: + sdp = sdp_connect(BDADDR_ANY, &bdaddr, SDP_RETRY_IF_BUSY); + if (!sdp) { + fprintf(stderr, "ERROR: Can't open Bluetooth connection\n"); + return CUPS_BACKEND_FAILED; + } + + switch (proto) { + case 1: + err = sdp_search_spp(sdp, &channel); + break; + case 2: + err = sdp_search_hcrp(sdp, &ctrl_psm, &data_psm); + break; + default: + proto = 2; + err = sdp_search_hcrp(sdp, &ctrl_psm, &data_psm); + if (err) { + proto = 1; + err = sdp_search_spp(sdp, &channel); + } + break; + } + + sdp_close(sdp); + + if (err) { + if (cups_class) { + fputs("INFO: Unable to contact printer, queuing on " + "next printer in class...\n", stderr); + sleep(5); + return CUPS_BACKEND_FAILED; + } + sleep(20); + fprintf(stderr, "ERROR: Can't get service information\n"); + goto service_search; + } + +connect: + switch (proto) { + case 1: + err = spp_print(BDADDR_ANY, &bdaddr, channel, + fd, copies, cups_class); + break; + case 2: + err = hcrp_print(BDADDR_ANY, &bdaddr, ctrl_psm, data_psm, + fd, copies, cups_class); + break; + default: + err = CUPS_BACKEND_FAILED; + fprintf(stderr, "ERROR: Unsupported protocol\n"); + break; + } + + if (err == CUPS_BACKEND_FAILED && cups_class) { + fputs("INFO: Unable to contact printer, queuing on " + "next printer in class...\n", stderr); + sleep(5); + return CUPS_BACKEND_FAILED; + } else if (err == CUPS_BACKEND_RETRY) { + sleep(20); + goto connect; + } + + if (fd != 0) + close(fd); + + if (!err) + fprintf(stderr, "INFO: Ready to print\n"); + + return err; +} |