[thirdparty/cups.git] / backend / runloop.c

/*
 * "$Id: runloop.c 7895 2008-09-02 19:19:43Z mike $"
 *
 *   Common run loop APIs for the Common UNIX Printing System (CUPS).
 *
 *   Copyright 2007-2009 by Apple Inc.
 *   Copyright 2006-2007 by Easy Software Products, all rights reserved.
 *
 *   These coded instructions, statements, and computer programs are the
 *   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, see the license at "http://www.cups.org/".
 *
 *   This file is subject to the Apple OS-Developed Software exception.
 *
 * Contents:
 *
 *   backendDrainOutput() - Drain pending print data to the device.
 *   backendRunLoop()     - Read and write print and back-channel data.
 */

/*
 * Include necessary headers.
 */

#include "backend-private.h"
#include <limits.h>
#ifdef __hpux
#  include <sys/time.h>
#else
#  include <sys/select.h>
#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)
	{
	  _cupsLangPrintf(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.
 */

ssize_t					/* O - Total bytes on success, -1 on error */
backendRunLoop(
    int         print_fd,		/* I - Print file descriptor */
    int         device_fd,		/* I - Device file descriptor */
    int         snmp_fd,		/* I - SNMP socket or -1 if none */
    http_addr_t *addr,			/* I - Address of device */
    int         use_bc,			/* I - Use back-channel? */
    int         (*side_cb)(int, int, int, http_addr_t *, int))
					/* I - Side-channel callback */
{
  int		nfds;			/* Maximum file descriptor value + 1 */
  fd_set	input,			/* Input set for reading */
		output;			/* Output set for writing */
  ssize_t	print_bytes,		/* Print bytes read */
		bc_bytes,		/* Backchannel bytes read */
		total_bytes,		/* Total bytes written */
		bytes;			/* Bytes written */
  int		paperout;		/* "Paper out" status */
  int		offline;		/* "Off-line" status */
  char		print_buffer[8192],	/* Print data buffer */
		*print_ptr,		/* Pointer into print data buffer */
		bc_buffer[1024];	/* Back-channel data buffer */
  struct timeval timeout;		/* Timeout for select() */
  time_t	curtime,		/* Current time */
		snmp_update = 0;
#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
  struct sigaction action;		/* Actions for POSIX signals */
#endif /* HAVE_SIGACTION && !HAVE_SIGSET */


  fprintf(stderr,
          "DEBUG: backendRunLoop(print_fd=%d, device_fd=%d, snmp_fd=%d, "
	  "addr=%p, use_bc=%d, side_cb=%p)\n",
          print_fd, device_fd, snmp_fd, addr, use_bc, side_cb);

 /*
  * If we are printing data from a print driver on stdin, ignore SIGTERM
  * so that the driver can finish out any page data, e.g. to eject the
  * current page.  We only do this for stdin printing as otherwise there
  * is no way to cancel a raw print job...
  */

  if (!print_fd)
  {
#ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
    sigset(SIGTERM, SIG_IGN);
#elif defined(HAVE_SIGACTION)
    memset(&action, 0, sizeof(action));

    sigemptyset(&action.sa_mask);
    action.sa_handler = SIG_IGN;
    sigaction(SIGTERM, &action, NULL);
#else
    signal(SIGTERM, SIG_IGN);
#endif /* HAVE_SIGSET */
  }
  else if (print_fd < 0)
  {
   /*
    * Copy print data from stdin, but don't mess with the signal handlers...
    */

    print_fd = 0;
  }

 /*
  * 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 (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...
    */

    FD_ZERO(&input);
    if (!print_bytes)
      FD_SET(print_fd, &input);
    if (use_bc)
      FD_SET(device_fd, &input);
    if (!print_bytes && side_cb)
      FD_SET(CUPS_SC_FD, &input);

    FD_ZERO(&output);
    if (print_bytes || (!use_bc && !side_cb))
      FD_SET(device_fd, &output);

    if (use_bc || side_cb)
    {
      timeout.tv_sec  = 5;
      timeout.tv_usec = 0;

      if (select(nfds, &input, &output, NULL, &timeout) < 0)
      {
       /*
	* Pause printing to clear any pending errors...
	*/

	if (errno == ENXIO && offline != 1)
	{
	  fputs("STATE: +offline-report\n", stderr);
	  _cupsLangPuts(stderr, _("INFO: Printer is currently offline.\n"));
	  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;
      }
    }

   /*
    * Check if we have a side-channel request ready...
    */

    if (side_cb && FD_ISSET(CUPS_SC_FD, &input))
    {
     /*
      * Do the side-channel request, then start back over in the select
      * loop since it may have read from print_fd...
      */

      if ((*side_cb)(print_fd, device_fd, snmp_fd, addr, use_bc))
        side_cb = NULL;
      continue;
    }

   /*
    * Check if we have back-channel data ready...
    */

    if (FD_ISSET(device_fd, &input))
    {
      if ((bc_bytes = read(device_fd, bc_buffer, sizeof(bc_buffer))) > 0)
      {
	fprintf(stderr,
	        "DEBUG: Received " CUPS_LLFMT " bytes of back-channel data\n",
	        CUPS_LLCAST bc_bytes);
        cupsBackChannelWrite(bc_buffer, bc_bytes, 1.0);
      }
      else if (bc_bytes < 0 && errno != EAGAIN && errno != EINTR)
      {
        fprintf(stderr, "DEBUG: Error reading back-channel data: %s\n",
	        strerror(errno));
	use_bc = 0;
      }
    }

   /*
    * Check if we have print data ready...
    */

    if (FD_ISSET(print_fd, &input))
    {
      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, break out of the loop...
	*/

        break;
      }

      print_ptr = print_buffer;

      fprintf(stderr, "DEBUG: Read %d bytes of print data...\n",
              (int)print_bytes);
    }

   /*
    * Check if the device is ready to receive data and we have data to
    * send...
    */

    if (print_bytes && FD_ISSET(device_fd, &output))
    {
      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)
	{
	  if (paperout != 1)
	  {
	    fputs("STATE: +media-empty-warning\n", stderr);
	    _cupsLangPuts(stderr, _("ERROR: Out of paper\n"));
	    paperout = 1;
	  }
        }
	else if (errno == ENXIO)
	{
	  if (offline != 1)
	  {
	    fputs("STATE: +offline-report\n", stderr);
	    _cupsLangPuts(stderr, _("INFO: Printer is currently off-line.\n"));
	    offline = 1;
	  }
	}
	else if (errno != EAGAIN && errno != EINTR && errno != ENOTTY)
	{
	  fprintf(stderr, _("ERROR: Unable to write print data: %s\n"),
	          strerror(errno));
	  return (-1);
	}
      }
      else
      {
        if (paperout)
	{
	  fputs("STATE: -media-empty-warning\n", stderr);
	  paperout = 0;
	}

	if (offline)
	{
	  fputs("STATE: -offline-report\n", stderr);
	  _cupsLangPuts(stderr, _("INFO: Printer is now online.\n"));
	  offline = 0;
	}

        fprintf(stderr, "DEBUG: Wrote %d bytes of print data...\n", (int)bytes);

        print_bytes -= bytes;
	print_ptr   += bytes;
	total_bytes += bytes;
      }
    }

   /*
    * Do SNMP updates periodically...
    */

    if (snmp_fd >= 0 && time(&curtime) >= snmp_update)
    {
      if (backendSNMPSupplies(snmp_fd, addr, NULL, NULL))
        snmp_update = INT_MAX;
      else
        snmp_update = curtime + 5;
    }
  }

 /*
  * Return with success...
  */

  return (total_bytes);
}


/*
 * End of "$Id: runloop.c 7895 2008-09-02 19:19:43Z mike $".
 */
Commit	Line	Data
ed486911	1	/*
b19ccc9e	2	* "$Id: runloop.c 7895 2008-09-02 19:19:43Z mike $"
ed486911	3	*
09a101d6	4	* Common run loop APIs for the Common UNIX Printing System (CUPS).
ed486911	5	*
4d301e69	6	* Copyright 2007-2009 by Apple Inc.
f7deaa1a	7	* Copyright 2006-2007 by Easy Software Products, all rights reserved.
ed486911	8	*
ed486911	9	* These coded instructions, statements, and computer programs are the
bc44d920	10	* property of Apple Inc. and are protected by Federal copyright
bc44d920	11	* law. Distribution and use rights are outlined in the file "LICENSE.txt"
ed486911	12	* "LICENSE" which should have been included with this file. If this
bc44d920	13	* file is missing or damaged, see the license at "http://www.cups.org/".
ed486911	14	*
	15	* This file is subject to the Apple OS-Developed Software exception.
	16	*
	17	* Contents:
	18	*
09a101d6	19	* backendDrainOutput() - Drain pending print data to the device.
09a101d6	20	* backendRunLoop() - Read and write print and back-channel data.
ed486911	21	*/
	22
	23	/*
	24	* Include necessary headers.
	25	*/
	26
	27	#include "backend-private.h"
568fa3fa	28	#include <limits.h>
d09495fa	29	#ifdef __hpux
	30	# include <sys/time.h>
	31	#else
	32	# include <sys/select.h>
	33	#endif /* __hpux */
ed486911	34
ed486911	35
09a101d6	36	/*
	37	* 'backendDrainOutput()' - Drain pending print data to the device.
	38	*/
	39
	40	int /* O - 0 on success, -1 on error */
	41	backendDrainOutput(int print_fd, /* I - Print file descriptor */
	42	int device_fd) /* I - Device file descriptor */
	43	{
	44	int nfds; /* Maximum file descriptor value + 1 */
	45	fd_set input; /* Input set for reading */
	46	ssize_t print_bytes, /* Print bytes read */
	47	bytes; /* Bytes written */
	48	char print_buffer[8192], /* Print data buffer */
	49	print_ptr; / Pointer into print data buffer */
	50	struct timeval timeout; /* Timeout for read... */
	51
	52
	53	fprintf(stderr, "DEBUG: backendDrainOutput(print_fd=%d, device_fd=%d)\n",
	54	print_fd, device_fd);
	55
	56	/*
	57	* Figure out the maximum file descriptor value to use with select()...
	58	*/
	59
	60	nfds = (print_fd > device_fd ? print_fd : device_fd) + 1;
	61
	62	/*
	63	* Now loop until we are out of data from print_fd...
	64	*/
	65
	66	for (;;)
	67	{
	68	/*
	69	* Use select() to determine whether we have data to copy around...
	70	*/
	71
	72	FD_ZERO(&input);
	73	FD_SET(print_fd, &input);
	74
	75	timeout.tv_sec = 0;
	76	timeout.tv_usec = 0;
	77
	78	if (select(nfds, &input, NULL, NULL, &timeout) < 0)
	79	return (-1);
	80
	81	if (!FD_ISSET(print_fd, &input))
	82	return (0);
	83
	84	if ((print_bytes = read(print_fd, print_buffer,
	85	sizeof(print_buffer))) < 0)
	86	{
	87	/*
	88	* Read error - bail if we don't see EAGAIN or EINTR...
	89	*/
	90
	91	if (errno != EAGAIN \|\| errno != EINTR)
	92	{
	93	perror("ERROR: Unable to read print data");
	94	return (-1);
	95	}
	96
	97	print_bytes = 0;
	98	}
	99	else if (print_bytes == 0)
100	{
101	/*
102	* End of file, return...
103	*/
104
105	return (0);
106	}
107
108	fprintf(stderr, "DEBUG: Read %d bytes of print data...\n",
109	(int)print_bytes);
110
111	for (print_ptr = print_buffer; print_bytes > 0;)
112	{
113	if ((bytes = write(device_fd, print_ptr, print_bytes)) < 0)
114	{
115	/*
116	* Write error - bail if we don't see an error we can retry...
117	*/
118
119	if (errno != ENOSPC && errno != ENXIO && errno != EAGAIN &&
120	errno != EINTR && errno != ENOTTY)
121	{
db1f069b MS	122	_cupsLangPrintf(stderr, _("ERROR: Unable to write print data: %s\n"),
db1f069b MS	123	strerror(errno));
09a101d6	124	return (-1);
	125	}
	126	}
	127	else
	128	{
	129	fprintf(stderr, "DEBUG: Wrote %d bytes of print data...\n", (int)bytes);
	130
	131	print_bytes -= bytes;
	132	print_ptr += bytes;
	133	}
	134	}
	135	}
	136	}
	137
	138
ed486911	139	/*
	140	* 'backendRunLoop()' - Read and write print and back-channel data.
	141	*/
	142
	143	ssize_t /* O - Total bytes on success, -1 on error */
f7deaa1a	144	backendRunLoop(
568fa3fa MS	145	int print_fd, /* I - Print file descriptor */
	146	int device_fd, /* I - Device file descriptor */
	147	int snmp_fd, /* I - SNMP socket or -1 if none */
	148	http_addr_t addr, / I - Address of device */
	149	int use_bc, /* I - Use back-channel? */
18ecb428	150	int (side_cb)(int, int, int, http_addr_t , int))
568fa3fa	151	/* I - Side-channel callback */
ed486911	152	{
	153	int nfds; /* Maximum file descriptor value + 1 */
	154	fd_set input, /* Input set for reading */
	155	output; /* Output set for writing */
	156	ssize_t print_bytes, /* Print bytes read */
	157	bc_bytes, /* Backchannel bytes read */
	158	total_bytes, /* Total bytes written */
	159	bytes; /* Bytes written */
	160	int paperout; /* "Paper out" status */
8ca02f3c	161	int offline; /* "Off-line" status */
ed486911	162	char print_buffer[8192], /* Print data buffer */
	163	print_ptr, / Pointer into print data buffer */
	164	bc_buffer[1024]; /* Back-channel data buffer */
568fa3fa MS	165	struct timeval timeout; /* Timeout for select() */
	166	time_t curtime, /* Current time */
	167	snmp_update = 0;
ed486911	168	#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
	169	struct sigaction action; /* Actions for POSIX signals */
	170	#endif /* HAVE_SIGACTION && !HAVE_SIGSET */
	171
	172
c0e1af83	173	fprintf(stderr,
568fa3fa MS	174	"DEBUG: backendRunLoop(print_fd=%d, device_fd=%d, snmp_fd=%d, "
	175	"addr=%p, use_bc=%d, side_cb=%p)\n",
	176	print_fd, device_fd, snmp_fd, addr, use_bc, side_cb);
8ca02f3c	177
ed486911	178	/*
	179	* If we are printing data from a print driver on stdin, ignore SIGTERM
	180	* so that the driver can finish out any page data, e.g. to eject the
	181	* current page. We only do this for stdin printing as otherwise there
	182	* is no way to cancel a raw print job...
	183	*/
	184
	185	if (!print_fd)
	186	{
	187	#ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
	188	sigset(SIGTERM, SIG_IGN);
	189	#elif defined(HAVE_SIGACTION)
	190	memset(&action, 0, sizeof(action));
	191
	192	sigemptyset(&action.sa_mask);
	193	action.sa_handler = SIG_IGN;
	194	sigaction(SIGTERM, &action, NULL);
	195	#else
	196	signal(SIGTERM, SIG_IGN);
	197	#endif /* HAVE_SIGSET */
	198	}
4e6f60f0 MS	199	else if (print_fd < 0)
	200	{
	201	/*
	202	* Copy print data from stdin, but don't mess with the signal handlers...
	203	*/
	204
	205	print_fd = 0;
	206	}
ed486911	207
	208	/*
	209	* Figure out the maximum file descriptor value to use with select()...
	210	*/
	211
	212	nfds = (print_fd > device_fd ? print_fd : device_fd) + 1;
	213
	214	/*
	215	* Now loop until we are out of data from print_fd...
	216	*/
	217
b94498cf	218	for (print_bytes = 0, print_ptr = print_buffer, offline = -1,
b94498cf	219	paperout = -1, total_bytes = 0;;)
ed486911	220	{
	221	/*
	222	* Use select() to determine whether we have data to copy around...
	223	*/
	224
	225	FD_ZERO(&input);
	226	if (!print_bytes)
	227	FD_SET(print_fd, &input);
	228	if (use_bc)
	229	FD_SET(device_fd, &input);
dd1abb6b	230	if (!print_bytes && side_cb)
f7deaa1a	231	FD_SET(CUPS_SC_FD, &input);
ed486911	232
ed486911	233	FD_ZERO(&output);
91c84a35	234	if (print_bytes \|\| (!use_bc && !side_cb))
ed486911	235	FD_SET(device_fd, &output);
ed486911	236
f7deaa1a	237	if (use_bc \|\| side_cb)
8ca02f3c	238	{
568fa3fa MS	239	timeout.tv_sec = 5;
	240	timeout.tv_usec = 0;
	241
	242	if (select(nfds, &input, &output, NULL, &timeout) < 0)
8ca02f3c	243	{
	244	/*
	245	* Pause printing to clear any pending errors...
	246	*/
	247
b94498cf	248	if (errno == ENXIO && offline != 1)
8ca02f3c	249	{
c5571a1d	250	fputs("STATE: +offline-report\n", stderr);
080811b1	251	_cupsLangPuts(stderr, _("INFO: Printer is currently offline.\n"));
8ca02f3c	252	offline = 1;
8ca02f3c	253	}
b94498cf	254	else if (errno == EINTR && total_bytes == 0)
	255	{
	256	fputs("DEBUG: Received an interrupt before any bytes were "
4d301e69	257	"written, aborting\n", stderr);
b94498cf	258	return (0);
b94498cf	259	}
8ca02f3c	260
	261	sleep(1);
	262	continue;
	263	}
	264	}
ed486911	265
f7deaa1a	266	/*
	267	* Check if we have a side-channel request ready...
	268	*/
	269
	270	if (side_cb && FD_ISSET(CUPS_SC_FD, &input))
dd1abb6b MS	271	{
	272	/*
	273	* Do the side-channel request, then start back over in the select
	274	* loop since it may have read from print_fd...
	275	*/
	276
18ecb428 MS	277	if ((*side_cb)(print_fd, device_fd, snmp_fd, addr, use_bc))
18ecb428 MS	278	side_cb = NULL;
dd1abb6b MS	279	continue;
dd1abb6b MS	280	}
f7deaa1a	281
ed486911	282	/*
	283	* Check if we have back-channel data ready...
	284	*/
	285
	286	if (FD_ISSET(device_fd, &input))
	287	{
	288	if ((bc_bytes = read(device_fd, bc_buffer, sizeof(bc_buffer))) > 0)
	289	{
	290	fprintf(stderr,
4d301e69	291	"DEBUG: Received " CUPS_LLFMT " bytes of back-channel data\n",
ed486911	292	CUPS_LLCAST bc_bytes);
	293	cupsBackChannelWrite(bc_buffer, bc_bytes, 1.0);
	294	}
4b3f67ff MS	295	else if (bc_bytes < 0 && errno != EAGAIN && errno != EINTR)
	296	{
	297	fprintf(stderr, "DEBUG: Error reading back-channel data: %s\n",
	298	strerror(errno));
	299	use_bc = 0;
	300	}
ed486911	301	}
	302
	303	/*
	304	* Check if we have print data ready...
	305	*/
	306
	307	if (FD_ISSET(print_fd, &input))
	308	{
	309	if ((print_bytes = read(print_fd, print_buffer,
	310	sizeof(print_buffer))) < 0)
	311	{
	312	/*
	313	* Read error - bail if we don't see EAGAIN or EINTR...
	314	*/
	315
	316	if (errno != EAGAIN \|\| errno != EINTR)
	317	{
	318	perror("ERROR: Unable to read print data");
	319	return (-1);
	320	}
	321
	322	print_bytes = 0;
	323	}
	324	else if (print_bytes == 0)
	325	{
	326	/*
	327	* End of file, break out of the loop...
	328	*/
	329
	330	break;
	331	}
	332
	333	print_ptr = print_buffer;
8ca02f3c	334
	335	fprintf(stderr, "DEBUG: Read %d bytes of print data...\n",
	336	(int)print_bytes);
ed486911	337	}
	338
	339	/*
	340	* Check if the device is ready to receive data and we have data to
	341	* send...
	342	*/
	343
	344	if (print_bytes && FD_ISSET(device_fd, &output))
	345	{
	346	if ((bytes = write(device_fd, print_ptr, print_bytes)) < 0)
	347	{
	348	/*
	349	* Write error - bail if we don't see an error we can retry...
	350	*/
	351
	352	if (errno == ENOSPC)
	353	{
b94498cf	354	if (paperout != 1)
ed486911	355	{
c5571a1d	356	fputs("STATE: +media-empty-warning\n", stderr);
4d301e69	357	_cupsLangPuts(stderr, _("ERROR: Out of paper\n"));
ed486911	358	paperout = 1;
	359	}
	360	}
8ca02f3c	361	else if (errno == ENXIO)
8ca02f3c	362	{
b94498cf	363	if (offline != 1)
8ca02f3c	364	{
c5571a1d	365	fputs("STATE: +offline-report\n", stderr);
db1f069b	366	_cupsLangPuts(stderr, _("INFO: Printer is currently off-line.\n"));
8ca02f3c	367	offline = 1;
	368	}
	369	}
ed486911	370	else if (errno != EAGAIN && errno != EINTR && errno != ENOTTY)
ed486911	371	{
c0e1af83	372	fprintf(stderr, _("ERROR: Unable to write print data: %s\n"),
c0e1af83	373	strerror(errno));
ed486911	374	return (-1);
	375	}
	376	}
	377	else
	378	{
	379	if (paperout)
	380	{
c5571a1d	381	fputs("STATE: -media-empty-warning\n", stderr);
ed486911	382	paperout = 0;
	383	}
	384
8ca02f3c	385	if (offline)
8ca02f3c	386	{
c5571a1d	387	fputs("STATE: -offline-report\n", stderr);
080811b1	388	_cupsLangPuts(stderr, _("INFO: Printer is now online.\n"));
8ca02f3c	389	offline = 0;
	390	}
	391
	392	fprintf(stderr, "DEBUG: Wrote %d bytes of print data...\n", (int)bytes);
ed486911	393
	394	print_bytes -= bytes;
	395	print_ptr += bytes;
	396	total_bytes += bytes;
	397	}
	398	}
568fa3fa MS	399
	400	/*
	401	* Do SNMP updates periodically...
	402	*/
	403
	404	if (snmp_fd >= 0 && time(&curtime) >= snmp_update)
	405	{
	406	if (backendSNMPSupplies(snmp_fd, addr, NULL, NULL))
	407	snmp_update = INT_MAX;
	408	else
	409	snmp_update = curtime + 5;
	410	}
ed486911	411	}
	412
	413	/*
	414	* Return with success...
	415	*/
	416
	417	return (total_bytes);
	418	}
	419
	420
	421	/*
b19ccc9e	422	* End of "$Id: runloop.c 7895 2008-09-02 19:19:43Z mike $".
ed486911	423	*/