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malloc_usable_size(3)   Library Functions Manual   malloc_usable_size(3)

ИМЯ

       malloc_usable_size - obtain size of block of memory allocated
       from heap

БИБЛИОТЕКА

       Standard C library (libc, -lc)

СИНТАКСИС

       #include <malloc.h>

       size_t malloc_usable_size(void *_Nullable ptr);

ОПИСАНИЕ

       This function can be used for diagnostics or statistics about
       allocations from malloc(3) or a related function.

ЗНАЧЕНИЕ ВОЗВРАЩАЕМОГО ЗНАЧЕНИЯ

       malloc_usable_size() returns a value no less than the size of the
       block of allocated memory pointed to by ptr.  If ptr is NULL, 0
       is returned.

АТРИБУТЫ

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌─────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                           │ Attribute     │ Value   │
       ├─────────────────────────────────────┼───────────────┼─────────┤
       │ malloc_usable_size()                │ Thread safety │ MT-Safe │
       └─────────────────────────────────────┴───────────────┴─────────┘

СТАНДАРТЫ

       GNU.

ЗАМЕЧАНИЯ

       The value returned by malloc_usable_size() may be greater than
       the requested size of the allocation because of various internal
       implementation details, none of which the programmer should rely
       on.  This function is intended to only be used for diagnostics
       and statistics; writing to the excess memory without first
       calling realloc(3) to resize the allocation is not supported.
       The returned value is only valid at the time of the call.

СМОТРИТЕ ТАКЖЕ

       malloc(3)

КОЛОФОН

       This page is part of the man-pages (Linux kernel and C library
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       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
       This page was obtained from the tarball man-pages-6.9.1.tar.gz
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Linux man-pages 6.9.1          2024-05-02          malloc_usable_size(3)

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