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authorRich Felker <dalias@aerifal.cx>2018-04-17 18:36:19 -0400
committerRich Felker <dalias@aerifal.cx>2018-04-18 14:22:49 -0400
commitc9f415d7ea2dace5bf77f6518b6afc36bb7a5732 (patch)
tree53e90cc28b51fd50185527bfbd71411e1ef05843 /src/malloc/calloc.c
parentc1014a812c90bab3c9c989863e4ebb129e987de6 (diff)
downloadmusl-c9f415d7ea2dace5bf77f6518b6afc36bb7a5732.tar.gz
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 'src/malloc/calloc.c')
-rw-r--r--src/malloc/calloc.c13
1 files changed, 0 insertions, 13 deletions
diff --git a/src/malloc/calloc.c b/src/malloc/calloc.c
deleted file mode 100644
index 436c0b03..00000000
--- a/src/malloc/calloc.c
+++ /dev/null
@@ -1,13 +0,0 @@
-#include <stdlib.h>
-#include <errno.h>
-
-void *__malloc0(size_t);
-
-void *calloc(size_t m, size_t n)
-{
- if (n && m > (size_t)-1/n) {
- errno = ENOMEM;
- return 0;
- }
- return __malloc0(n * m);
-}