From a2efd46c7752d3508edb6e1733efdcbda7072557 Mon Sep 17 00:00:00 2001
From: Jai Luthra <luthrajaiji@gmail.com>
Date: Sat, 22 Aug 2020 13:23:58 +0530
Subject: [PATCH] Added missing cancel_job handler.

Signed-off-by: Jai Luthra <luthrajaiji@gmail.com>
---
 filter/rastertops.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/filter/rastertops.c b/filter/rastertops.c
index 90c0bb644..29c3d45f6 100644
--- a/filter/rastertops.c
+++ b/filter/rastertops.c
@@ -25,6 +25,7 @@
  */
 
 #include <cupsfilters/filter.h>
+#include <signal.h>
 
 /*
  * Local globals...
@@ -32,6 +33,14 @@
 
 static int		JobCanceled = 0;/* Set to 1 on SIGTERM */
 
+
+/*
+ * Local functions...
+ */
+
+static void		cancel_job(int sig);
+
+
 /*
  * 'main()' - Main entry and processing of driver.
  */
@@ -41,8 +50,27 @@ main(int  argc,	   /* I - Number of command-line arguments */
      char *argv[]) /* I - Command-line arguments */
 {
   int           ret;
+#if defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
+  struct sigaction action;		/* Actions for POSIX signals */
+#endif /* HAVE_SIGACTION && !HAVE_SIGSET */
+
+ /*
+  * Register a signal handler to cleanly cancel a job.
+  */
+
+#ifdef HAVE_SIGSET /* Use System V signals over POSIX to avoid bugs */
+  sigset(SIGTERM, cancel_job);
+#elif defined(HAVE_SIGACTION)
+  memset(&action, 0, sizeof(action));
+
+  sigemptyset(&action.sa_mask);
+  action.sa_handler = cancel_job;
+  sigaction(SIGTERM, &action, NULL);
+#else
+  signal(SIGTERM, cancel_job);
+#endif /* HAVE_SIGSET */
 
-  /*
+ /*
   * Fire up the rastertops() filter function
   */
 
@@ -53,3 +81,17 @@ main(int  argc,	   /* I - Number of command-line arguments */
 
   return (ret);
 }
+
+
+/*
+ * 'cancel_job()' - Flag the job as canceled.
+ */
+
+static void
+cancel_job(int sig)			/* I - Signal number (unused) */
+{
+  (void)sig;
+
+  JobCanceled = 1;
+}
+
-- 
2.47.2