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author | Rich Felker <dalias@aerifal.cx> | 2018-04-17 18:36:19 -0400 |
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committer | Rich Felker <dalias@aerifal.cx> | 2018-04-18 14:22:49 -0400 |
commit | c9f415d7ea2dace5bf77f6518b6afc36bb7a5732 (patch) | |
tree | 53e90cc28b51fd50185527bfbd71411e1ef05843 /src/stdio/stdout.c | |
parent | c1014a812c90bab3c9c989863e4ebb129e987de6 (diff) | |
download | musl-c9f415d7ea2dace5bf77f6518b6afc36bb7a5732.tar.gz musl-c9f415d7ea2dace5bf77f6518b6afc36bb7a5732.tar.bz2 musl-c9f415d7ea2dace5bf77f6518b6afc36bb7a5732.tar.xz musl-c9f415d7ea2dace5bf77f6518b6afc36bb7a5732.zip |
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/stdio/stdout.c')
0 files changed, 0 insertions, 0 deletions