From ecd3459e7bb829202601e3274411135a15c64dde Mon Sep 17 00:00:00 2001
From: ian <ian@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon, 17 Sep 2012 16:38:38 +0000
Subject: libbacktrace/: 	* Initial implementation.

./:
	* MAINTAINERS (Various Maintainers): Add libbacktrace.
	* configure.ac (host_libs): Add libbacktrace.
	(target_libraries): Add libbacktrace.
	* Makefile.def (host_modules): Add libbacktrace.
	(target_modules): Likewise.
	* configure, Makefile.in: Rebuild.

gcc/go:
	* config-lang.in (target_libs): Add target-libbacktrace.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@191397 138bc75d-0d04-0410-961f-82ee72b054a4
---
 libbacktrace/read.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 libbacktrace/read.c

(limited to 'libbacktrace/read.c')

diff --git a/libbacktrace/read.c b/libbacktrace/read.c
new file mode 100644
index 00000000000..a1eac5d06c0
--- /dev/null
+++ b/libbacktrace/read.c
@@ -0,0 +1,96 @@
+/* read.c -- File views without mmap.
+   Copyright (C) 2012 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor, Google.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    (1) Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer. 
+
+    (2) 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.  
+    
+    (3) The name of the author may not be used to
+    endorse or promote products derived from this software without
+    specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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"
+
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "backtrace.h"
+#include "internal.h"
+
+/* This file implements file views when mmap is not available.  */
+
+/* Create a view of SIZE bytes from DESCRIPTOR at OFFSET.  */
+
+int
+backtrace_get_view (struct backtrace_state *state, int descriptor,
+		    off_t offset, size_t size,
+		    backtrace_error_callback error_callback,
+		    void *data, struct backtrace_view *view)
+{
+  ssize_t got;
+
+  if (lseek (descriptor, offset, SEEK_SET) < 0)
+    {
+      error_callback (data, "lseek", errno);
+      return 0;
+    }
+
+  view->base = backtrace_alloc (state, size, error_callback, data);
+  if (view->base == NULL)
+    return 0;
+  view->data = view->base;
+  view->len = size;
+
+  got = read (descriptor, view->base, size);
+  if (got < 0)
+    {
+      error_callback (data, "read", errno);
+      free (view->base);
+      return 0;
+    }
+
+  if ((size_t) got < size)
+    {
+      error_callback (data, "file too short", 0);
+      free (view->base);
+      return 0;
+    }
+
+  return 1;
+}
+
+/* Release a view read by backtrace_get_view.  */
+
+void
+backtrace_release_view (struct backtrace_state *state,
+			struct backtrace_view *view,
+			backtrace_error_callback error_callback,
+			void *data)
+{
+  backtrace_free (state, view->base, view->len, error_callback, data);
+  view->data = NULL;
+  view->base = NULL;
+}
-- 
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