/*
- * "$Id: runloop.c 6170 2007-01-02 17:26:41Z mike $"
+ * Common run loop APIs for CUPS backends.
*
- * Common run loop API for the Common UNIX Printing System (CUPS).
+ * Copyright © 2007-2014 by Apple Inc.
+ * Copyright © 2006-2007 by Easy Software Products, all rights reserved.
*
- * 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
- * "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
- *
- * This file is subject to the Apple OS-Developed Software exception.
- *
- * Contents:
- *
- * backendRunLoop() - Read and write print and back-channel data.
+ * Licensed under Apache License v2.0. See the file "LICENSE" for more
+ * information.
*/
/*
*/
#include "backend-private.h"
-#ifdef __hpux
-# include <sys/time.h>
-#else
-# include <sys/select.h>
-#endif /* __hpux */
+#include <limits.h>
+#include <sys/select.h>
+
+
+/*
+ * '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)
+ {
+ fprintf(stderr, "DEBUG: Read failed: %s\n", strerror(errno));
+ _cupsLangPrintFilter(stderr, "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, (size_t)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)
+ {
+ _cupsLangPrintError("ERROR", _("Unable to write print data"));
+ return (-1);
+ }
+ }
+ else
+ {
+ fprintf(stderr, "DEBUG: Wrote %d bytes of print data...\n", (int)bytes);
+
+ print_bytes -= bytes;
+ print_ptr += bytes;
+ }
+ }
+ }
+}
/*
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 use_bc, /* I - Use back-channel? */
- void (*side_cb)(int, int, 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 */
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, use_bc=%d)\n",
- print_fd, device_fd, use_bc);
+ 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
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()...
* 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...
FD_SET(print_fd, &input);
if (use_bc)
FD_SET(device_fd, &input);
- if (side_cb)
+ if (!print_bytes && side_cb)
FD_SET(CUPS_SC_FD, &input);
FD_ZERO(&output);
- if (print_bytes || !use_bc)
+ if (print_bytes || (!use_bc && !side_cb))
FD_SET(device_fd, &output);
if (use_bc || side_cb)
{
- if (select(nfds, &input, &output, NULL, NULL) < 0)
+ 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)
+ if (errno == ENXIO && offline != 1 && update_state)
{
- fputs("STATE: +offline-error\n", stderr);
- fputs("INFO: Printer is currently off-line.\n", stderr);
+ fputs("STATE: +offline-report\n", stderr);
+ _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);
+ return (0);
+ }
sleep(1);
continue;
*/
if (side_cb && FD_ISSET(CUPS_SC_FD, &input))
- (*side_cb)(print_fd, device_fd, use_bc);
+ {
+ /*
+ * 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 ((bc_bytes = read(device_fd, bc_buffer, sizeof(bc_buffer))) > 0)
{
fprintf(stderr,
- "DEBUG: Received " CUPS_LLFMT " bytes of back-channel data!\n",
+ "DEBUG: Received " CUPS_LLFMT " bytes of back-channel data\n",
CUPS_LLCAST bc_bytes);
- cupsBackChannelWrite(bc_buffer, bc_bytes, 1.0);
+ cupsBackChannelWrite(bc_buffer, (size_t)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;
+ }
+ else if (bc_bytes == 0)
+ use_bc = 0;
}
/*
* Read error - bail if we don't see EAGAIN or EINTR...
*/
- if (errno != EAGAIN || errno != EINTR)
+ 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 (print_bytes && FD_ISSET(device_fd, &output))
{
- if ((bytes = write(device_fd, print_ptr, print_bytes)) < 0)
+ if ((bytes = write(device_fd, print_ptr, (size_t)print_bytes)) < 0)
{
/*
* Write error - bail if we don't see an error we can retry...
if (errno == ENOSPC)
{
- if (!paperout)
+ if (paperout != 1 && update_state)
{
- fputs("ERROR: Out of paper!\n", stderr);
- fputs("STATE: +media-empty-error\n", stderr);
+ fputs("STATE: +media-empty-warning\n", stderr);
+ fputs("DEBUG: Out of paper\n", stderr);
paperout = 1;
}
}
else if (errno == ENXIO)
{
- if (!offline)
+ if (offline != 1 && update_state)
{
- fputs("STATE: +offline-error\n", stderr);
- fputs("INFO: Printer is currently off-line.\n", stderr);
+ fputs("STATE: +offline-report\n", stderr);
+ _cupsLangPrintFilter(stderr, "INFO",
+ _("The printer is not connected."));
offline = 1;
}
}
else if (errno != EAGAIN && errno != EINTR && errno != ENOTTY)
{
- perror("ERROR: Unable to write print data");
+ _cupsLangPrintError("ERROR", _("Unable to write print data"));
return (-1);
}
}
else
{
- if (paperout)
+ if (paperout && update_state)
{
- fputs("STATE: -media-empty-error\n", stderr);
+ fputs("STATE: -media-empty-warning\n", stderr);
paperout = 0;
}
- if (offline)
+ if (offline && update_state)
{
- fputs("STATE: -offline-error\n", stderr);
- fputs("INFO: Printer is now on-line.\n", stderr);
+ fputs("STATE: -offline-report\n", stderr);
+ _cupsLangPrintFilter(stderr, "INFO",
+ _("The printer is now connected."));
offline = 0;
}
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;
+ }
}
/*
/*
- * End of "$Id: runloop.c 6170 2007-01-02 17:26:41Z 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);
+}
projects / thirdparty / cups.git / blobdiff