elf.c (elf_add): Close descriptor if we use a debugfile.

	* elf.c (elf_add): Close descriptor if we use a debugfile.
	* btest.c (check_open_files): New static function.
	(main): Call check_open_files.

From-SVN: r257275

libbacktrace/ChangeLog

+2018-01-31  Ian Lance Taylor  <iant@golang.org>
+
+	* elf.c (elf_add): Close descriptor if we use a debugfile.
+	* btest.c (check_open_files): New static function.
+	(main): Call check_open_files.
+
 2018-01-25  Ian Lance Taylor  <iant@golang.org>
 
 	* elf.c (elf_open_debugfile_by_debuglink): Don't check CRC if the

libbacktrace/btest.c

@@ -37,6 +37,7 @@ POSSIBILITY OF SUCH DAMAGE.  */
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 
 #include "filenames.h"
 
@@ -456,6 +457,25 @@ test5 (void)
   return failures;
 }
 
+/* Check that are no files left open.  */
+
+static void
+check_open_files (void)
+{
+  int i;
+
+  for (i = 3; i < 10; i++)
+    {
+      if (close (i) == 0)
+	{
+	  fprintf (stderr,
+		   "ERROR: descriptor %d still open after tests complete\n",
+		   i);
+	  ++failures;
+	}
+    }
+}
+
 /* Run all the tests.  */
 
 int
@@ -474,5 +494,7 @@ main (int argc ATTRIBUTE_UNUSED, char **argv)
 #endif
 #endif
 
+  check_open_files ();
+
   exit (failures ? EXIT_FAILURE : EXIT_SUCCESS);
 }

libbacktrace/elf.c

@@ -2929,12 +2929,19 @@ elf_add (struct backtrace_state *state, const char *filename, int descriptor,
 					 error_callback, data);
       if (d >= 0)
 	{
+	  int ret;
+
 	  backtrace_release_view (state, &buildid_view, error_callback, data);
 	  if (debuglink_view_valid)
 	    backtrace_release_view (state, &debuglink_view, error_callback,
 				    data);
-	  return elf_add (state, NULL, d, base_address, error_callback, data,
+	  ret = elf_add (state, NULL, d, base_address, error_callback, data,
 			 fileline_fn, found_sym, found_dwarf, 0, 1);
+	  if (ret < 0)
+	    backtrace_close (d, error_callback, data);
+	  else
+	    backtrace_close (descriptor, error_callback, data);
+	  return ret;
 	}
     }
 
@@ -2953,10 +2960,17 @@ elf_add (struct backtrace_state *state, const char *filename, int descriptor,
 					   data);
       if (d >= 0)
 	{
+	  int ret;
+
 	  backtrace_release_view (state, &debuglink_view, error_callback,
 				  data);
-	  return elf_add (state, NULL, d, base_address, error_callback, data,
+	  ret = elf_add (state, NULL, d, base_address, error_callback, data,
 			 fileline_fn, found_sym, found_dwarf, 0, 1);
+	  if (ret < 0)
+	    backtrace_close (d, error_callback, data);
+	  else
+	    backtrace_close(descriptor, error_callback, data);
+	  return ret;
 	}
     }