diff -up cups-2.2.5/scheduler/avahi.c.avahi-no-threaded cups-2.2.5/scheduler/avahi.c

--- cups-2.2.5/scheduler/avahi.c.avahi-no-threaded	2017-10-17 19:03:00.760881016 +0200

+++ cups-2.2.5/scheduler/avahi.c	2017-10-17 19:03:00.760881016 +0200

@@ -0,0 +1,441 @@

+/*

+ * "$Id$"

+ *

+ *   Avahi poll implementation for the CUPS scheduler.

+ *

+ *   Copyright (C) 2010, 2011 Red Hat, Inc.

+ *   Authors:

+ *    Tim Waugh <twaugh@redhat.com>

+ *

+ *   Redistribution and use in source and binary forms, with or without

+ *   modification, are permitted provided that the following conditions

+ *   are met:

+ *

+ *   Redistributions of source code must retain the above copyright

+ *   notice, this list of conditions and the following disclaimer.

+ *

+ *   Redistributions in binary form must reproduce the above copyright

+ *   notice, this list of conditions and the following disclaimer in the

+ *   documentation and/or other materials provided with the distribution.

+ *

+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

+ *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

+ *   COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

+ *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

+ *   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

+ *   SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

+ *   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

+ *   STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

+ *   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

+ *   OF THE POSSIBILITY OF SUCH DAMAGE.

+ *

+ * Contents:

+ *

+ *   watch_read_cb         - Read callback for file descriptor

+ *   watch_write_cb        - Write callback for file descriptor

+ *   watched_fd_add_select() - Call cupsdAddSelect() as needed

+ *   watch_new()           - Create a new file descriptor watch

+ *   watch_free()          - Free a file descriptor watch

+ *   watch_update()        - Update watched events for a file descriptor

+ *   watch_get_events()    - Get events that happened for a file descriptor

+ *   timeout_cb()          - Run a timed Avahi callback

+ *   timeout_new()         - Set a wakeup time

+ *   timeout_update()      - Update the expiration time for a timeout

+ *   timeout_free()        - Free a timeout

+ *   compare_watched_fds() - Compare watched file descriptors for array sorting

+ *   avahi_cups_poll_new() - Create a new Avahi main loop object for CUPS

+ *   avahi_cups_poll_free() - Free an Avahi main loop object for CUPS

+ *   avahi_cups_poll_get() - Get the abstract poll API structure

+ */

+

+#include <config.h>

+

+#ifdef HAVE_AVAHI /* Applies to entire file... */

+

+/*

+ * Include necessary headers...

+ */

+

+#include "cupsd.h"

+

+#if defined(HAVE_MALLOC_H) && defined(HAVE_MALLINFO)

+#  include <malloc.h>

+#endif /* HAVE_MALLOC_H && HAVE_MALLINFO */

+

+#ifdef HAVE_AVAHI

+#  include <avahi-common/timeval.h>

+#endif /* HAVE_AVAHI */

+

+

+typedef struct

+{

+  AvahiCupsPoll *cups_poll;

+

+  int fd;

+  AvahiWatchEvent occurred;

+  cups_array_t *watches;

+} cupsd_watched_fd_t;

+

+struct AvahiWatch

+{

+  cupsd_watched_fd_t *watched_fd;

+

+  AvahiWatchEvent events;

+  AvahiWatchCallback callback;

+  void *userdata;

+};

+

+struct AvahiTimeout

+{

+  AvahiCupsPoll *cups_poll;

+  AvahiTimeoutCallback callback;

+  void *userdata;

+  cupsd_timeout_t *cupsd_timeout;

+};

+

+/*

+ * Local functions...

+ */

+

+static AvahiWatch *	watch_new(const AvahiPoll *api,

+				  int fd,

+				  AvahiWatchEvent events,

+				  AvahiWatchCallback callback,

+				  void *userdata);

+static void		watch_free(AvahiWatch *watch);

+static void		watch_update(AvahiWatch *watch,

+				     AvahiWatchEvent events);

+static AvahiWatchEvent	watch_get_events(AvahiWatch *watch);

+

+

+/*

+ * 'watch_read_cb' - Read callback for file descriptor

+ */

+

+static void

+watch_read_cb (void *userdata)

+{

+  AvahiWatch *watch;

+  cupsd_watched_fd_t *watched_fd = userdata;

+  watched_fd->occurred |= AVAHI_WATCH_IN;

+  for (watch = (AvahiWatch *)cupsArrayFirst(watched_fd->watches);

+       watch;

+       watch = (AvahiWatch *)cupsArrayNext(watched_fd->watches))

+  {

+    if (watch->events & watched_fd->occurred)

+    {

+      (watch->callback) (watch, watched_fd->fd,

+			 AVAHI_WATCH_IN, watch->userdata);

+      watched_fd->occurred &= ~AVAHI_WATCH_IN;

+      break;

+    }

+  }

+}

+

+

+/*

+ * 'watch_write_cb' - Write callback for file descriptor

+ */

+

+static void

+watch_write_cb (void *userdata)

+{

+  AvahiWatch *watch;

+  cupsd_watched_fd_t *watched_fd = userdata;

+  watched_fd->occurred |= AVAHI_WATCH_OUT;

+  for (watch = (AvahiWatch *)cupsArrayFirst(watched_fd->watches);

+       watch;

+       watch = (AvahiWatch *)cupsArrayNext(watched_fd->watches))

+  {

+    if (watch->events & watched_fd->occurred)

+    {

+      (watch->callback) (watch, watched_fd->fd,

+			 AVAHI_WATCH_OUT, watch->userdata);

+      watched_fd->occurred &= ~AVAHI_WATCH_OUT;

+      break;

+    }

+  }

+}

+

+

+/*

+ * 'watched_fd_add_select' - Call cupsdAddSelect() as needed

+ */

+

+static int						/* O - Watches? */

+watched_fd_add_select (cupsd_watched_fd_t *watched_fd)

+{

+  AvahiWatch *watch;

+  cupsd_selfunc_t read_cb = NULL, write_cb = NULL;

+  int any_watches = 0;

+

+  for (watch = (AvahiWatch *)cupsArrayFirst(watched_fd->watches);

+       watch;

+       watch = (AvahiWatch *)cupsArrayNext(watched_fd->watches))

+  {

+    any_watches = 1;

+    if (watch->events & (AVAHI_WATCH_IN |

+			     AVAHI_WATCH_ERR |

+			     AVAHI_WATCH_HUP))

+    {

+      read_cb = (cupsd_selfunc_t)watch_read_cb;

+      if (write_cb != NULL)

+	break;

+    }

+

+    if (watch->events & AVAHI_WATCH_OUT)

+    {

+      write_cb = (cupsd_selfunc_t)watch_write_cb;

+      if (read_cb != NULL)

+	break;

+    }

+  }

+

+  if (read_cb || write_cb)

+    cupsdAddSelect (watched_fd->fd, read_cb, write_cb, watched_fd);

+  else

+    cupsdRemoveSelect (watched_fd->fd);

+

+  return (any_watches);

+}

+

+/*

+ * 'watch_new' - Create a new file descriptor watch

+ */

+

+static AvahiWatch *

+watch_new (const AvahiPoll *api,

+	   int fd,

+	   AvahiWatchEvent events,

+	   AvahiWatchCallback callback,

+	   void *userdata)

+{

+  cupsd_watched_fd_t key, *watched_fd;

+  AvahiCupsPoll *cups_poll = api->userdata;

+  AvahiWatch *watch = malloc(sizeof(AvahiWatch));

+  if (watch == NULL)

+    return (NULL);

+

+  watch->events = events;

+  watch->callback = callback;

+  watch->userdata = userdata;

+

+  key.fd = fd;

+  watched_fd = cupsArrayFind (cups_poll->watched_fds, &key);

+  if (watched_fd == NULL)

+  {

+    watched_fd = malloc(sizeof(cupsd_watched_fd_t));

+    if (watched_fd == NULL)

+    {

+      free (watch);

+      return (NULL);

+    }

+

+    watched_fd->fd = fd;

+    watched_fd->occurred = 0;

+    watched_fd->cups_poll = cups_poll;

+    watched_fd->watches = cupsArrayNew (NULL, NULL);

+    cupsArrayAdd (cups_poll->watched_fds, watched_fd);

+  }

+

+  watch->watched_fd = watched_fd;

+  cupsArrayAdd(watched_fd->watches, watch);

+  watched_fd_add_select (watched_fd);

+  return (watch);

+}

+

+

+/*

+ * 'watch_free' - Free a file descriptor watch

+ */

+

+static void

+watch_free (AvahiWatch *watch)

+{

+  cupsd_watched_fd_t *watched_fd = watch->watched_fd;

+  AvahiCupsPoll *cups_poll = watched_fd->cups_poll;

+

+  cupsArrayRemove (watched_fd->watches, watch);

+  free (watch);

+

+  if (!watched_fd_add_select (watched_fd))

+  {

+    /* No more watches */

+    cupsArrayRemove (cups_poll->watched_fds, watched_fd);

+    free (watched_fd);

+  }

+}

+

+

+/*

+ * 'watch_update' - Update watched events for a file descriptor

+ */

+

+static void

+watch_update (AvahiWatch *watch,

+	      AvahiWatchEvent events)

+{

+  watch->events = events;

+  watched_fd_add_select (watch->watched_fd);

+}

+

+

+/*

+ * 'watch_get_events' - Get events that happened for a file descriptor

+ */

+

+static AvahiWatchEvent

+watch_get_events (AvahiWatch *watch)

+{

+  return (watch->watched_fd->occurred);

+}

+

+

+/*

+ * 'timeout_cb()' - Run a timed Avahi callback

+ */

+

+static void

+timeout_cb (cupsd_timeout_t *cupsd_timeout, void *userdata)

+{

+  AvahiTimeout *timeout = userdata;

+  (timeout->callback) (timeout, timeout->userdata);

+}

+

+

+/*

+ * 'timeout_new' - Set a wakeup time

+ */

+

+static AvahiTimeout *

+timeout_new (const AvahiPoll *api,

+	     const struct timeval *tv,

+	     AvahiTimeoutCallback callback,

+	     void *userdata)

+{

+  AvahiTimeout *timeout;

+  AvahiCupsPoll *cups_poll = api->userdata;

+

+  timeout = malloc(sizeof(AvahiTimeout));

+  if (timeout == NULL)

+    return (NULL);

+

+  timeout->cups_poll = cups_poll;

+  timeout->callback = callback;

+  timeout->userdata = userdata;

+  timeout->cupsd_timeout = cupsdAddTimeout (tv,

+					    (cupsd_timeoutfunc_t)timeout_cb,

+					    timeout);

+  cupsArrayAdd (cups_poll->timeouts, timeout);

+  return (timeout);

+}

+

+

+/*

+ * 'timeout_update' - Update the expiration time for a timeout

+ */

+

+static void

+timeout_update (AvahiTimeout *timeout,

+		const struct timeval *tv)

+{

+  cupsdUpdateTimeout (timeout->cupsd_timeout, tv);

+}

+

+

+/*

+ * ' timeout_free' - Free a timeout

+ */

+

+static void

+timeout_free (AvahiTimeout *timeout)

+{

+  cupsArrayRemove (timeout->cups_poll->timeouts, timeout);

+  cupsdRemoveTimeout (timeout->cupsd_timeout);

+  free (timeout);

+}

+

+

+/*

+ * 'compare_watched_fds' - Compare watched file descriptors for array sorting

+ */

+static int

+compare_watched_fds(cupsd_watched_fd_t *p0,

+		    cupsd_watched_fd_t *p1)

+{

+  /*

+   * Compare by fd (no two elements have the same fd)

+   */

+

+  if (p0->fd == p1->fd)

+    return 0;

+

+  return (p0->fd < p1->fd ? -1 : 1);

+}

+

+

+/*

+ * 'avahi_cups_poll_new' - Create a new Avahi main loop object for CUPS

+ */

+

+AvahiCupsPoll *

+avahi_cups_poll_new (void)

+{

+  AvahiCupsPoll *cups_poll = malloc(sizeof(AvahiCupsPoll));

+  if (cups_poll == NULL)

+    return (NULL);

+

+  cups_poll->watched_fds = cupsArrayNew ((cups_array_func_t)compare_watched_fds,

+					 NULL);

+  cups_poll->timeouts = cupsArrayNew (NULL, NULL);

+

+  cups_poll->api.userdata = cups_poll;

+  cups_poll->api.watch_new = watch_new;

+  cups_poll->api.watch_free = watch_free;

+  cups_poll->api.watch_update = watch_update;

+  cups_poll->api.watch_get_events = watch_get_events;

+

+  cups_poll->api.timeout_new = timeout_new;

+  cups_poll->api.timeout_update = timeout_update;

+  cups_poll->api.timeout_free = timeout_free;

+

+  return (cups_poll);

+}

+

+

+/*

+ * 'avahi_cups_poll_free' - Free an Avahi main loop object for CUPS

+ */

+void

+avahi_cups_poll_free (AvahiCupsPoll *cups_poll)

+{

+  cupsd_watched_fd_t *watched_fd;

+

+  for (watched_fd = (cupsd_watched_fd_t*)cupsArrayFirst(cups_poll->watched_fds);

+       watched_fd;

+       watched_fd = (cupsd_watched_fd_t*)cupsArrayNext(cups_poll->watched_fds))

+    cupsArrayClear (watched_fd->watches);

+

+  cupsArrayClear (cups_poll->watched_fds);

+  cupsArrayClear (cups_poll->timeouts);

+}

+

+

+/*

+ * 'avahi_cups_poll_get' - Get the abstract poll API structure

+ */

+

+const AvahiPoll *

+avahi_cups_poll_get (AvahiCupsPoll *cups_poll)

+{

+  return (&cups_poll->api);

+}

+

+

+#endif /* HAVE_AVAHI ... from top of file */

+

+/*

+ * End of "$Id$".

+ */

diff -up cups-2.2.5/scheduler/avahi.h.avahi-no-threaded cups-2.2.5/scheduler/avahi.h

--- cups-2.2.5/scheduler/avahi.h.avahi-no-threaded	2017-10-17 19:03:00.760881016 +0200

+++ cups-2.2.5/scheduler/avahi.h	2017-10-17 19:03:00.760881016 +0200

@@ -0,0 +1,69 @@

+/*

+ * "$Id$"

+ *

+ *   Avahi poll implementation for the CUPS scheduler.

+ *

+ *   Copyright (C) 2010, 2011 Red Hat, Inc.

+ *   Authors:

+ *    Tim Waugh <twaugh@redhat.com>

+ *

+ *   Redistribution and use in source and binary forms, with or without

+ *   modification, are permitted provided that the following conditions

+ *   are met:

+ *

+ *   Redistributions of source code must retain the above copyright

+ *   notice, this list of conditions and the following disclaimer.

+ *

+ *   Redistributions in binary form must reproduce the above copyright

+ *   notice, this list of conditions and the following disclaimer in the

+ *   documentation and/or other materials provided with the distribution.

+ *

+ *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

+ *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

+ *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS

+ *   FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE

+ *   COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,

+ *   INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

+ *   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

+ *   SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

+ *   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

+ *   STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

+ *   ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

+ *   OF THE POSSIBILITY OF SUCH DAMAGE.

+ */

+

+#include <config.h>

+

+#ifdef HAVE_AVAHI

+#  include <avahi-client/client.h>

+#  include <avahi-client/publish.h>

+#endif /* HAVE_AVAHI */

+

+#ifdef HAVE_AUTHORIZATION_H

+#  include <Security/Authorization.h>

+#endif /* HAVE_AUTHORIZATION_H */

+

+

+#ifdef HAVE_AVAHI

+typedef struct

+{

+    AvahiPoll api;

+    cups_array_t *watched_fds;

+    cups_array_t *timeouts;

+} AvahiCupsPoll;

+#endif /* HAVE_AVAHI */

+

+/*

+ * Prototypes...

+ */

+

+#ifdef HAVE_AVAHI

+extern AvahiCupsPoll *	avahi_cups_poll_new(void);

+extern void		avahi_cups_poll_free(AvahiCupsPoll *cups_poll);

+extern const AvahiPoll *avahi_cups_poll_get(AvahiCupsPoll *cups_poll);

+#endif /* HAVE_AVAHI */

+

+

+/*

+ * End of "$Id$".

+ */

diff -up cups-2.2.5/scheduler/cupsd.h.avahi-no-threaded cups-2.2.5/scheduler/cupsd.h

--- cups-2.2.5/scheduler/cupsd.h.avahi-no-threaded	2017-10-13 20:22:26.000000000 +0200

+++ cups-2.2.5/scheduler/cupsd.h	2017-10-17 19:03:00.760881016 +0200

@@ -118,6 +118,7 @@ extern const char *cups_hstrerror(int);

 #include "colorman.h"

 #include "conf.h"

 #include "banners.h"

+#include "avahi.h"

 #include "dirsvc.h"

 #include "network.h"

 #include "subscriptions.h"

@@ -138,6 +139,15 @@ extern const char *cups_hstrerror(int);

 typedef void (*cupsd_selfunc_t)(void *data);

+#ifdef HAVE_AVAHI

+/*

+ * Timeout callback function type...

+ */

+

+typedef struct _cupsd_timeout_s cupsd_timeout_t;

+typedef void (*cupsd_timeoutfunc_t)(cupsd_timeout_t *timeout, void *data);

+#endif /* HAVE_AVAHI */

+

 /*

  * Globals...

@@ -162,6 +172,9 @@ VAR int			OnDemand	VALUE(0);

 					/* Launched on demand */

 #endif /* HAVE_ONDEMAND */

+#ifdef HAVE_AVAHI

+VAR cups_array_t *Timeouts;		/* Timed callbacks for main loop */

+#endif /* HAVE_AVAHI */

 /*

  * Prototypes...

@@ -224,3 +237,15 @@ extern void		cupsdStopSelect(void);

 /* server.c */

 extern void		cupsdStartServer(void);

 extern void		cupsdStopServer(void);

+

+#ifdef HAVE_AVAHI

+extern void     cupsdInitTimeouts(void);

+extern cupsd_timeout_t *cupsdAddTimeout (const struct timeval *tv,

+					 cupsd_timeoutfunc_t cb,

+					 void *data);

+extern cupsd_timeout_t *cupsdNextTimeout (long *delay);

+extern void     cupsdRunTimeout (cupsd_timeout_t *timeout);

+extern void     cupsdUpdateTimeout (cupsd_timeout_t *timeout,

+				    const struct timeval *tv);

+extern void     cupsdRemoveTimeout (cupsd_timeout_t *timeout);

+#endif /* HAVE_AVAHI */

\ No newline at end of file

diff -up cups-2.2.5/scheduler/dirsvc.c.avahi-no-threaded cups-2.2.5/scheduler/dirsvc.c

--- cups-2.2.5/scheduler/dirsvc.c.avahi-no-threaded	2017-10-13 20:22:26.000000000 +0200

+++ cups-2.2.5/scheduler/dirsvc.c	2017-10-17 19:05:35.938592292 +0200

@@ -193,7 +193,7 @@ cupsdStartBrowsing(void)

     cupsdUpdateDNSSDName();

 #  else /* HAVE_AVAHI */

-    if ((DNSSDMaster = avahi_threaded_poll_new()) == NULL)

+    if ((DNSSDMaster = avahi_cups_poll_new()) == NULL)

     {

       cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to create DNS-SD thread.");

@@ -204,7 +204,7 @@ cupsdStartBrowsing(void)

     {

       int error;			/* Error code, if any */

-      DNSSDClient = avahi_client_new(avahi_threaded_poll_get(DNSSDMaster), AVAHI_CLIENT_NO_FAIL, dnssdClientCallback, NULL, &error);

+      DNSSDClient = avahi_client_new(avahi_cups_poll_get(DNSSDMaster), AVAHI_CLIENT_NO_FAIL, dnssdClientCallback, NULL, &error);

       if (DNSSDClient == NULL)

       {

@@ -215,11 +215,9 @@ cupsdStartBrowsing(void)

         if (FatalErrors & CUPSD_FATAL_BROWSE)

 	  cupsdEndProcess(getpid(), 0);

-        avahi_threaded_poll_free(DNSSDMaster);

+        avahi_cups_poll_free(DNSSDMaster);

         DNSSDMaster = NULL;

       }

-      else

-	avahi_threaded_poll_start(DNSSDMaster);

     }

 #  endif /* HAVE_DNSSD */

   }

@@ -635,7 +633,7 @@ dnssdClientCallback(

 	  * Renew Avahi client...

 	  */

-	  DNSSDClient = avahi_client_new(avahi_threaded_poll_get(DNSSDMaster), AVAHI_CLIENT_NO_FAIL, dnssdClientCallback, NULL, &error);

+	  DNSSDClient = avahi_client_new(avahi_cups_poll_get(DNSSDMaster), AVAHI_CLIENT_NO_FAIL, dnssdClientCallback, NULL, &error);

 	  if (!DNSSDClient)

 	  {

@@ -701,13 +699,7 @@ dnssdDeregisterInstance(

 #  else /* HAVE_AVAHI */

   if (*srv)

   {

-    if (!from_callback)

-      avahi_threaded_poll_lock(DNSSDMaster);

-

     avahi_entry_group_free(*srv);

-

-    if (!from_callback)

-      avahi_threaded_poll_unlock(DNSSDMaster);

   }

 #  endif /* HAVE_DNSSD */

@@ -1029,16 +1021,10 @@ dnssdRegisterInstance(

   (void)commit;

 #  else /* HAVE_AVAHI */

-  if (!from_callback)

-    avahi_threaded_poll_lock(DNSSDMaster);

-

   if (!*srv)

     *srv = avahi_entry_group_new(DNSSDClient, dnssdRegisterCallback, NULL);

   if (!*srv)

   {

-    if (!from_callback)

-      avahi_threaded_poll_unlock(DNSSDMaster);

-

     cupsdLogMessage(CUPSD_LOG_WARN, "DNS-SD registration of \"%s\" failed: %s",

                     name, dnssdErrorString(avahi_client_errno(DNSSDClient)));

     return (0);

@@ -1153,9 +1139,6 @@ dnssdRegisterInstance(

       cupsdLogMessage(CUPSD_LOG_DEBUG, "DNS-SD commit of \"%s\" failed.",

                       name);

   }

-

-  if (!from_callback)

-    avahi_threaded_poll_unlock(DNSSDMaster);

 #  endif /* HAVE_DNSSD */

   if (error)

@@ -1326,9 +1309,6 @@ dnssdStop(void)

   DNSSDMaster = NULL;

 #  else /* HAVE_AVAHI */

-  if (DNSSDMaster)

-    avahi_threaded_poll_stop(DNSSDMaster);

-

   if (DNSSDClient)

   {

     avahi_client_free(DNSSDClient);

@@ -1337,7 +1317,7 @@ dnssdStop(void)

   if (DNSSDMaster)

   {

-    avahi_threaded_poll_free(DNSSDMaster);

+    avahi_cups_poll_free(DNSSDMaster);

     DNSSDMaster = NULL;

   }

 #  endif /* HAVE_DNSSD */

diff -up cups-2.2.5/scheduler/dirsvc.h.avahi-no-threaded cups-2.2.5/scheduler/dirsvc.h

--- cups-2.2.5/scheduler/dirsvc.h.avahi-no-threaded	2017-10-13 20:22:26.000000000 +0200

+++ cups-2.2.5/scheduler/dirsvc.h	2017-10-17 19:03:00.761881007 +0200

@@ -49,7 +49,7 @@ VAR cups_array_t	*DNSSDPrinters	VALUE(NU

 VAR DNSServiceRef	DNSSDMaster	VALUE(NULL);

 					/* Master DNS-SD service reference */

 #  else /* HAVE_AVAHI */

-VAR AvahiThreadedPoll	*DNSSDMaster	VALUE(NULL);

+VAR AvahiCupsPoll	*DNSSDMaster	VALUE(NULL);

 					/* Master polling interface for Avahi */

 VAR AvahiClient		*DNSSDClient	VALUE(NULL);

 					/* Client information */

diff -up cups-2.2.5/scheduler/main.c.avahi-no-threaded cups-2.2.5/scheduler/main.c

--- cups-2.2.5/scheduler/main.c.avahi-no-threaded	2017-10-17 19:03:00.753881074 +0200

+++ cups-2.2.5/scheduler/main.c	2017-10-17 19:03:00.761881007 +0200

@@ -131,7 +131,10 @@ main(int  argc,				/* I - Number of comm

   int			service_idle_exit;

 					/* Idle exit on select timeout? */

 #endif /* HAVE_ONDEMAND */

-

+#ifdef HAVE_AVAHI

+  cupsd_timeout_t	*tmo;		/* Next scheduled timed callback */

+  long			tmo_delay;	/* Time before it must be called */

+#endif /* HAVE_AVAHI */

 #ifdef HAVE_GETEUID

  /*

@@ -610,6 +613,14 @@ main(int  argc,				/* I - Number of comm

   httpInitialize();

+#ifdef HAVE_AVAHI

+ /*

+  * Initialize timed callback structures.

+  */

+

+  cupsdInitTimeouts();

+#endif /* HAVE_AVAHI */

+

   cupsdStartServer();

  /*

@@ -928,6 +939,16 @@ main(int  argc,				/* I - Number of comm

     }