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authorFlorian Weimer <fweimer@redhat.com>2018-10-30 13:11:47 +0100
committerFlorian Weimer <fweimer@redhat.com>2018-10-30 13:17:36 +0100
commitf5e7e95921847bd83186bfe621fc2b48c4de5477 (patch)
treed1750c3c4bff6622fef0599b3f38b1e5efdae558 /support/blob_repeat.h
parent2dd12baa045f25c52b30a34b10f72d51f2605413 (diff)
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stdlib/test-bz22786: Avoid spurious test failures using alias mappings
On systems without enough random-access memory, stdlib/test-bz22786 will go deeply into swap and time out, even with a substantial TIMEOUTFACTOR. This commit adds a facility to construct repeating strings with alias mappings, so that the requirement for physical memory, and uses it in stdlib/test-bz22786.
Diffstat (limited to 'support/blob_repeat.h')
-rw-r--r--support/blob_repeat.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/support/blob_repeat.h b/support/blob_repeat.h
new file mode 100644
index 0000000..8e9d7ff
--- /dev/null
+++ b/support/blob_repeat.h
@@ -0,0 +1,44 @@
+/* Repeating a memory blob, with alias mapping optimization.
+ Copyright (C) 2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef SUPPORT_BLOB_REPEAT_H
+#define SUPPORT_BLOB_REPEAT_H
+
+#include <stdbool.h>
+#include <stddef.h>
+
+struct support_blob_repeat
+{
+ void *start;
+ size_t size;
+ bool use_malloc;
+};
+
+/* Return an allocation of COUNT elements, each of ELEMENT_SIZE bytes,
+ initialized with the bytes starting at ELEMENT. The memory is
+ writable (and thus counts towards the commit charge). In case of
+ on error, all members of the return struct are zero-initialized,
+ and errno is set accordingly. */
+struct support_blob_repeat support_blob_repeat_allocate (const void *element,
+ size_t element_size,
+ size_t count);
+
+/* Deallocate the blob created by support_blob_repeat_allocate. */
+void support_blob_repeat_free (struct support_blob_repeat *);
+
+#endif /* SUPPORT_BLOB_REPEAT_H */