2217955 - Enlarge backlog queue for listen() in cupsd

Resolves: rhbz#2217955

0001-cups-http-addr.c-Set-listen-backlog-size-to-INT_MAX-.patch

@@ -0,0 +1,35 @@
+From 876fdc1c90a885a58644c8757bc1283c9fd5bcb7 Mon Sep 17 00:00:00 2001
+From: Vasilis Liaskovitis <vliaskovitis@suse.com>
+Date: Wed, 1 Mar 2023 13:46:28 +0100
+Subject: [PATCH] cups/http-addr.c: Set listen backlog size to INT_MAX (fixes
+ #308)
+
+Use a listen queue size of INT_MAX, which should default to the maximum
+supported queue size on the system.
+
+This avoids the problem of the listening backlog queue getting full when
+there are too many requests at the same time. The problem was observed
+with the previous backlog size (128) by customers when submitting large
+batches of print jobs, resulting in some jobs getting lost.
+
+Signed-off-by: Vasilis Liaskovitis <vliaskovitis@suse.com>
+---
+ cups/http-addr.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/cups/http-addr.c b/cups/http-addr.c
+index a61ee0449..6aeeb8074 100644
+--- a/cups/http-addr.c
++++ b/cups/http-addr.c
+@@ -249,7 +249,7 @@ httpAddrListen(http_addr_t *addr,	/* I - Address to bind to */
+   * Listen...
+   */
+ 
+-  if (listen(fd, 5))
++  if (listen(fd, INT_MAX))
+   {
+     _cupsSetHTTPError(HTTP_STATUS_ERROR);
+ 
+-- 
+2.41.0
+

cups.spec

@@ -147,6 +147,8 @@ Patch79: cups-kerberos.patch
 Patch80: 0001-Fix-delays-printing-to-lpd-when-reserved-ports-are-e.patch
 # 2217283 - The command "cancel -x <job>" does not remove job files
 Patch81: 0001-Use-purge-job-instead-of-purge-jobs-when-canceling-a.patch
+# 2217955 - Enlarge backlog queue for listen() in cupsd
+Patch82: 0001-cups-http-addr.c-Set-listen-backlog-size-to-INT_MAX-.patch
 
 Patch1000: cups-lspp.patch
 
@@ -437,6 +439,8 @@ Sends IPP requests to the specified URI and tests and/or displays the results.
 %patch80 -p1 -b .lpd-delay
 # 2217283 - The command "cancel -x <job>" does not remove job files
 %patch81 -p1 -b .purge-job
+# 2217955 - Enlarge backlog queue for listen() in cupsd
+%patch82 -p1 -b .listen-backlog
 
 sed -i -e '1iMaxLogSize 0' conf/cupsd.conf.in
 
@@ -859,6 +863,7 @@ rm -f %{cups_serverbin}/backend/smb
 * Thu Jun 29 2023 Zdenek Dohnal <zdohnal@redhat.com> - 1:2.2.6-52
 - 2217178 - Delays printing to lpd when reserved ports are exhausted
 - 2217283 - The command "cancel -x <job>" does not remove job files
+- 2217955 - Enlarge backlog queue for listen() in cupsd
 
 * Mon Apr 03 2023 Zdenek Dohnal <zdohnal@redhat.com> - 1:2.2.6-51
 - RHEL-316 - Enable fmf tests in centos stream