/*
- * "$Id: runloop.c 6403 2007-03-27 16:00:56Z mike $"
+ * "$Id: runloop.c 6649 2007-07-11 21:46:42Z mike $"
*
- * Common run loop API for the Common UNIX Printing System (CUPS).
+ * Common run loop APIs for the Common UNIX Printing System (CUPS).
*
+ * Copyright 2007 by Apple Inc.
* Copyright 2006-2007 by Easy Software Products, all rights reserved.
*
* These coded instructions, statements, and computer programs are the
- * property of Easy Software Products and are protected by Federal
- * copyright law. Distribution and use rights are outlined in the file
+ * property of Apple Inc. and are protected by Federal copyright
+ * law. Distribution and use rights are outlined in the file "LICENSE.txt"
* "LICENSE" which should have been included with this file. If this
- * file is missing or damaged please contact Easy Software Products
- * at:
- *
- * Attn: CUPS Licensing Information
- * Easy Software Products
- * 44141 Airport View Drive, Suite 204
- * Hollywood, Maryland 20636 USA
- *
- * Voice: (301) 373-9600
- * EMail: cups-info@cups.org
- * WWW: http://www.cups.org
+ * file is missing or damaged, see the license at "http://www.cups.org/".
*
* This file is subject to the Apple OS-Developed Software exception.
*
* Contents:
*
- * backendRunLoop() - Read and write print and back-channel data.
+ * backendDrainOutput() - Drain pending print data to the device.
+ * backendRunLoop() - Read and write print and back-channel data.
*/
/*
#endif /* __hpux */
+/*
+ * 'backendDrainOutput()' - Drain pending print data to the device.
+ */
+
+int /* O - 0 on success, -1 on error */
+backendDrainOutput(int print_fd, /* I - Print file descriptor */
+ int device_fd) /* I - Device file descriptor */
+{
+ int nfds; /* Maximum file descriptor value + 1 */
+ fd_set input; /* Input set for reading */
+ ssize_t print_bytes, /* Print bytes read */
+ bytes; /* Bytes written */
+ char print_buffer[8192], /* Print data buffer */
+ *print_ptr; /* Pointer into print data buffer */
+ struct timeval timeout; /* Timeout for read... */
+
+
+ fprintf(stderr, "DEBUG: backendDrainOutput(print_fd=%d, device_fd=%d)\n",
+ print_fd, device_fd);
+
+ /*
+ * Figure out the maximum file descriptor value to use with select()...
+ */
+
+ nfds = (print_fd > device_fd ? print_fd : device_fd) + 1;
+
+ /*
+ * Now loop until we are out of data from print_fd...
+ */
+
+ for (;;)
+ {
+ /*
+ * Use select() to determine whether we have data to copy around...
+ */
+
+ FD_ZERO(&input);
+ FD_SET(print_fd, &input);
+
+ timeout.tv_sec = 0;
+ timeout.tv_usec = 0;
+
+ if (select(nfds, &input, NULL, NULL, &timeout) < 0)
+ return (-1);
+
+ if (!FD_ISSET(print_fd, &input))
+ return (0);
+
+ if ((print_bytes = read(print_fd, print_buffer,
+ sizeof(print_buffer))) < 0)
+ {
+ /*
+ * Read error - bail if we don't see EAGAIN or EINTR...
+ */
+
+ if (errno != EAGAIN || errno != EINTR)
+ {
+ perror("ERROR: Unable to read print data");
+ return (-1);
+ }
+
+ print_bytes = 0;
+ }
+ else if (print_bytes == 0)
+ {
+ /*
+ * End of file, return...
+ */
+
+ return (0);
+ }
+
+ fprintf(stderr, "DEBUG: Read %d bytes of print data...\n",
+ (int)print_bytes);
+
+ for (print_ptr = print_buffer; print_bytes > 0;)
+ {
+ if ((bytes = write(device_fd, print_ptr, print_bytes)) < 0)
+ {
+ /*
+ * Write error - bail if we don't see an error we can retry...
+ */
+
+ if (errno != ENOSPC && errno != ENXIO && errno != EAGAIN &&
+ errno != EINTR && errno != ENOTTY)
+ {
+ fprintf(stderr, _("ERROR: Unable to write print data: %s\n"),
+ strerror(errno));
+ return (-1);
+ }
+ }
+ else
+ {
+ fprintf(stderr, "DEBUG: Wrote %d bytes of print data...\n", (int)bytes);
+
+ print_bytes -= bytes;
+ print_ptr += bytes;
+ }
+ }
+ }
+}
+
+
/*
* 'backendRunLoop()' - Read and write print and back-channel data.
*/
fprintf(stderr,
- "DEBUG: backendRunLoop(print_fd=%d, device_fd=%d, use_bc=%d)\n",
- print_fd, device_fd, use_bc);
+ "DEBUG: backendRunLoop(print_fd=%d, device_fd=%d, use_bc=%d, "
+ "side_cb=%p)\n",
+ print_fd, device_fd, use_bc, side_cb);
/*
* If we are printing data from a print driver on stdin, ignore SIGTERM
* Now loop until we are out of data from print_fd...
*/
- for (print_bytes = 0, print_ptr = print_buffer, offline = 0, paperout = 0, total_bytes = 0;;)
+ for (print_bytes = 0, print_ptr = print_buffer, offline = -1,
+ paperout = -1, total_bytes = 0;;)
{
/*
* Use select() to determine whether we have data to copy around...
* Pause printing to clear any pending errors...
*/
- if (errno == ENXIO && !offline)
+ if (errno == ENXIO && offline != 1)
{
fputs("STATE: +offline-error\n", stderr);
fputs(_("INFO: Printer is currently off-line.\n"), stderr);
offline = 1;
}
+ else if (errno == EINTR && total_bytes == 0)
+ {
+ fputs("DEBUG: Received an interrupt before any bytes were "
+ "written, aborting!\n", stderr);
+ return (0);
+ }
sleep(1);
continue;
if (errno == ENOSPC)
{
- if (!paperout)
+ if (paperout != 1)
{
fputs("STATE: +media-empty-error\n", stderr);
fputs(_("ERROR: Out of paper!\n"), stderr);
}
else if (errno == ENXIO)
{
- if (!offline)
+ if (offline != 1)
{
fputs("STATE: +offline-error\n", stderr);
fputs(_("INFO: Printer is currently off-line.\n"), stderr);
/*
- * End of "$Id: runloop.c 6403 2007-03-27 16:00:56Z mike $".
+ * End of "$Id: runloop.c 6649 2007-07-11 21:46:42Z mike $".
*/
projects / thirdparty / cups.git / blobdiff