path: root/dynamic.list
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authorRich Felker <>2018-04-17 18:36:19 -0400
committerRich Felker <>2018-04-18 14:22:49 -0400
commitc9f415d7ea2dace5bf77f6518b6afc36bb7a5732 (patch)
tree53e90cc28b51fd50185527bfbd71411e1ef05843 /dynamic.list
parentc1014a812c90bab3c9c989863e4ebb129e987de6 (diff)
allow interposition/replacement of allocator (malloc)
replacement is subject to conditions on the replacement functions. they may only call functions which are async-signal-safe, as specified either by POSIX or as an implementation-defined extension. if any allocator functions are replaced, at least malloc, realloc, and free must be provided. if calloc is not provided, it will behave as malloc+memset. any of the memalign-family functions not provided will fail with ENOMEM. in order to implement the above properties, calloc and __memalign check that they are using their own malloc or free, respectively. choice to check malloc or free is based on considerations of supporting __simple_malloc. in order to make this work, calloc is split into separate versions for __simple_malloc and full malloc; commit ba819787ee93ceae94efd274f7849e317c1bff58 already did most of the split anyway, and completing it saves an extra call frame. previously, use of -Bsymbolic-functions made dynamic interposition impossible. now, we are using an explicit dynamic-list, so add allocator functions to the list. most are not referenced anyway, but all are added for completeness.
Diffstat (limited to 'dynamic.list')
1 files changed, 9 insertions, 0 deletions
diff --git a/dynamic.list b/dynamic.list
index 8b4f2366..686f8eb4 100644
--- a/dynamic.list
+++ b/dynamic.list
@@ -6,6 +6,15 @@ stdin;