From 78ced35a8b0a5b4c400f0d2088601e7f2e2500cb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zdenko=20Podobn=C3=BD?= <zdenop@gmail.com>
Date: Sun, 16 Jun 2019 21:08:13 +0200
Subject: [PATCH] restore CatchSignals to fix API compatibility

---
 src/api/baseapi.cpp | 19 +++++++++++++++++++
 src/api/baseapi.h   |  6 ++++++
 2 files changed, 25 insertions(+)

diff --git a/src/api/baseapi.cpp b/src/api/baseapi.cpp
index 4b97840c..ecb3e62c 100644
--- a/src/api/baseapi.cpp
+++ b/src/api/baseapi.cpp
@@ -253,6 +253,25 @@ size_t TessBaseAPI::getOpenCLDevice(void **data) {
   return 0;
 }
 
+/**
+ * Writes the thresholded image to stderr as a PBM file on receipt of a
+ * SIGSEGV, SIGFPE, or SIGBUS signal. (Linux/Unix only).
+ */
+void TessBaseAPI::CatchSignals() {
+#ifdef __linux__
+  struct sigaction action;
+  memset(&action, 0, sizeof(action));
+  action.sa_handler = &signal_exit;
+  action.sa_flags = SA_RESETHAND;
+  sigaction(SIGSEGV, &action, nullptr);
+  sigaction(SIGFPE, &action, nullptr);
+  sigaction(SIGBUS, &action, nullptr);
+#else
+  // Warn API users that an implementation is needed.
+  tprintf("CatchSignals has no non-linux implementation!\n");
+#endif
+}
+
 /**
  * Set the name of the input file. Needed only for training and
  * loading a UNLV zone file.
diff --git a/src/api/baseapi.h b/src/api/baseapi.h
index 66d0718d..3724dd92 100644
--- a/src/api/baseapi.h
+++ b/src/api/baseapi.h
@@ -107,6 +107,12 @@ class TESS_API TessBaseAPI {
    */
   static size_t getOpenCLDevice(void **device);
 
+  /**
+   * Writes the thresholded image to stderr as a PBM file on receipt of a
+   * SIGSEGV, SIGFPE, or SIGBUS signal. (Linux/Unix only).
+   */
+  static void CatchSignals();
+
   /**
    * Set the name of the input file. Needed for training and
    * reading a UNLV zone file, and for searchable PDF output.