/*
- * "$Id: runloop.c 7895 2008-09-02 19:19:43Z mike $"
+ * "$Id: runloop.c 9565 2011-02-23 00:08:08Z mike $"
*
- * Common run loop APIs for the Common UNIX Printing System (CUPS).
+ * Common run loop APIs for CUPS backends.
*
- * Copyright 2007-2009 by Apple Inc.
+ * Copyright 2007-2012 by Apple Inc.
* Copyright 2006-2007 by Easy Software Products, all rights reserved.
*
* These coded instructions, statements, and computer programs are the
*
* backendDrainOutput() - Drain pending print data to the device.
* backendRunLoop() - Read and write print and back-channel data.
+ * backendWaitLoop() - Wait for input from stdin while handling
+ * side-channel queries.
*/
/*
if (errno != EAGAIN || errno != EINTR)
{
- perror("ERROR: Unable to read print data");
+ fprintf(stderr, "DEBUG: Read failed: %s\n", strerror(errno));
+ _cupsLangPrintFilter(stderr, "ERROR", _("Unable to read print data."));
return (-1);
}
if (errno != ENOSPC && errno != ENXIO && errno != EAGAIN &&
errno != EINTR && errno != ENOTTY)
{
- _cupsLangPrintf(stderr, _("ERROR: Unable to write print data: %s\n"),
- strerror(errno));
+ _cupsLangPrintError("ERROR", _("Unable to write print data"));
return (-1);
}
}
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 update_state, /* I - Update printer-state-reasons? */
- int (*side_cb)(int, int, int, http_addr_t *, int))
- /* I - Side-channel callback */
+ 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 update_state, /* I - Update printer-state-reasons? */
+ _cups_sccb_t side_cb) /* I - Side-channel callback */
{
int nfds; /* Maximum file descriptor value + 1 */
fd_set input, /* Input set for reading */
if (errno == ENXIO && offline != 1 && update_state)
{
fputs("STATE: +offline-report\n", stderr);
- _cupsLangPuts(stderr, _("INFO: Printer is currently offline.\n"));
+ _cupsLangPrintFilter(stderr, "INFO",
+ _("The printer is not connected."));
offline = 1;
}
else if (errno == EINTR && total_bytes == 0)
{
fputs("DEBUG: Received an interrupt before any bytes were "
- "written, aborting\n", stderr);
+ "written, aborting.\n", stderr);
return (0);
}
strerror(errno));
use_bc = 0;
}
+ else if (bc_bytes == 0)
+ use_bc = 0;
}
/*
if (errno != EAGAIN || errno != EINTR)
{
- perror("ERROR: Unable to read print data");
+ fprintf(stderr, "DEBUG: Read failed: %s\n", strerror(errno));
+ _cupsLangPrintFilter(stderr, "ERROR",
+ _("Unable to read print data."));
return (-1);
}
if (paperout != 1 && update_state)
{
fputs("STATE: +media-empty-warning\n", stderr);
- _cupsLangPuts(stderr, _("DEBUG: Out of paper\n"));
+ fputs("DEBUG: Out of paper\n", stderr);
paperout = 1;
}
}
if (offline != 1 && update_state)
{
fputs("STATE: +offline-report\n", stderr);
- _cupsLangPuts(stderr, _("INFO: Printer is currently off-line.\n"));
+ _cupsLangPrintFilter(stderr, "INFO",
+ _("The printer is not connected."));
offline = 1;
}
}
else if (errno != EAGAIN && errno != EINTR && errno != ENOTTY)
{
- fprintf(stderr, _("ERROR: Unable to write print data: %s\n"),
- strerror(errno));
+ _cupsLangPrintError("ERROR", _("Unable to write print data"));
return (-1);
}
}
if (offline && update_state)
{
fputs("STATE: -offline-report\n", stderr);
- _cupsLangPuts(stderr, _("INFO: Printer is now online.\n"));
+ _cupsLangPrintFilter(stderr, "INFO",
+ _("The printer is now connected."));
offline = 0;
}
/*
- * End of "$Id: runloop.c 7895 2008-09-02 19:19:43Z mike $".
+ * 'backendWaitLoop()' - Wait for input from stdin while handling side-channel
+ * queries.
+ */
+
+int /* O - 1 if data is ready, 0 if not */
+backendWaitLoop(
+ 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? */
+ _cups_sccb_t side_cb) /* I - Side-channel callback */
+{
+ int nfds; /* Number of file descriptors */
+ fd_set input; /* Input set for reading */
+ time_t curtime = 0, /* Current time */
+ snmp_update = 0;/* Last SNMP status update */
+ struct timeval timeout; /* Timeout for select() */
+
+
+ fprintf(stderr, "DEBUG: backendWaitLoop(snmp_fd=%d, addr=%p, side_cb=%p)\n",
+ snmp_fd, addr, side_cb);
+
+ /*
+ * Now loop until we receive data from stdin...
+ */
+
+ if (snmp_fd >= 0)
+ snmp_update = time(NULL) + 5;
+
+ for (;;)
+ {
+ /*
+ * Use select() to determine whether we have data to copy around...
+ */
+
+ FD_ZERO(&input);
+ FD_SET(0, &input);
+ if (side_cb)
+ FD_SET(CUPS_SC_FD, &input);
+
+ if (snmp_fd >= 0)
+ {
+ curtime = time(NULL);
+ timeout.tv_sec = curtime >= snmp_update ? 0 : snmp_update - curtime;
+ timeout.tv_usec = 0;
+
+ nfds = select(CUPS_SC_FD + 1, &input, NULL, NULL, &timeout);
+ }
+ else
+ nfds = select(CUPS_SC_FD + 1, &input, NULL, NULL, NULL);
+
+ if (nfds < 0)
+ {
+ /*
+ * Pause printing to clear any pending errors...
+ */
+
+ if (errno == EINTR)
+ {
+ fputs("DEBUG: Received an interrupt before any bytes were "
+ "written, aborting.\n", stderr);
+ return (0);
+ }
+
+ sleep(1);
+ continue;
+ }
+
+ /*
+ * Check for input on stdin...
+ */
+
+ if (FD_ISSET(0, &input))
+ break;
+
+ /*
+ * 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)(0, -1, snmp_fd, addr, use_bc))
+ side_cb = NULL;
+ continue;
+ }
+
+ /*
+ * Do SNMP updates periodically...
+ */
+
+ if (snmp_fd >= 0 && curtime >= snmp_update)
+ {
+ if (backendSNMPSupplies(snmp_fd, addr, NULL, NULL))
+ snmp_fd = -1;
+ else
+ snmp_update = curtime + 5;
+ }
+ }
+
+ /*
+ * Return with success...
+ */
+
+ return (1);
+}
+
+
+/*
+ * End of "$Id: runloop.c 9565 2011-02-23 00:08:08Z mike $".
*/
projects / thirdparty / cups.git / blobdiff