From: Rusty Russell <rusty@vivaldi>
Date: Thu, 10 Jan 2008 12:28:39 +0000 (+1100)
Subject: Preserve errno on talloc_free
X-Git-Url: https://git.ozlabs.org/?p=ccan;a=commitdiff_plain;h=ec45d0d2bc380e740ad34b2342b3846685a32610;ds=inline

Preserve errno on talloc_free
---

diff --git a/talloc/talloc.c b/talloc/talloc.c
index 17bb0ec8..e9f531fe 100644
--- a/talloc/talloc.c
+++ b/talloc/talloc.c
@@ -730,7 +730,11 @@ void *talloc_named_const(const void *context, size_t size, const char *name)
 */
 int talloc_free(void *ptr)
 {
-	return _talloc_free(ptr);
+	int saved_errno = errno, ret;
+	ret = _talloc_free(ptr);
+	if (ret == 0)
+		errno = saved_errno;
+	return ret;
 }
 
 
diff --git a/talloc/talloc.h b/talloc/talloc.h
index f79f45b2..510cff75 100644
--- a/talloc/talloc.h
+++ b/talloc/talloc.h
@@ -100,6 +100,7 @@
  * returned for success and -1 for failure. The only possible failure condition
  * is if the pointer had a destructor attached to it and the destructor
  * returned -1. See talloc_set_destructor() for details on destructors.
+ * errno will be preserved unless the talloc_free fails.
  *
  * If this pointer has an additional parent when talloc_free() is called then
  * the memory is not actually released, but instead the most recently