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| -rw-r--r-- | doc/info/chap/memory-allocation.texinfo | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/doc/info/chap/memory-allocation.texinfo b/doc/info/chap/memory-allocation.texinfo index 474374b..d9d2e86 100644 --- a/doc/info/chap/memory-allocation.texinfo +++ b/doc/info/chap/memory-allocation.texinfo @@ -495,6 +495,61 @@ This function is a @sc{GNU} extension and requires @code{_GNU_SOURCE}. @end table +@hfindex{slibc-alloc.h} +@command{slibc} provides a number of additional +methods for memory management. These are defined +in the header file @file{<slibc-alloc.h>}. They +are available even if @code{_SLIBC_SOURCE} is not +defined, but it is required that neither +@code{_PORTABLE_SOURCE} nor @code{_LIBRARY_HEADER} +is defined. + +@table @code +@item void fast_free(void* ptr) +@fnindex fast_free +@cpindex Deallocate memory +@cpindex Memory, deallocation +This function is similar to @code{free}, but it +is guaranteed not to clear the memory. However, +the operating system kernel may still clear the +memory. + +@item void secure_free(void* ptr) +@fnindex secure_free +@cpindex Deallocate memory +@cpindex Memory, deallocation +This function is similar to @code{free}, but it +is guaranteed that the memory is clear. + +@item void FAST_FREE(void* ptr) +@fnindex FAST_FREE +@cpindex Deallocate memory +@cpindex Memory, deallocation +This clears deallocates a pointer with +@code{fast_free}, and sets @code{ptr} to +@code{NULL}. + +@item void SECURE_FREE(void* ptr) +@fnindex SECURE_FREE +@cpindex Deallocate memory +@cpindex Memory, deallocation +This clears deallocates a pointer with +@code{secure_free}, and sets @code{ptr} to +@code{NULL}. + +@item size_t allocsize(void* ptr) +@fnindex allocsize +@cpindex Retrieve allocation size +@cpindex Allocation size, retrieve +This function returns the number of usable bytes +for a pointer. If @code{ptr} is @code{NULL}, zero +is returned. It has the same restrictions as the +function @code{free}. + +@code{allocsize(malloc(n))} returns @code{n} +(and allocates memory in the process.) +@end table + @node Aligned memory allocation @@ -681,6 +736,10 @@ p = aligned_alloc(sizeof(*p), n) @end table +@c TODO @item void* rememalign(void* ptr, size_t boundary, size_t size, enum rememalign_mode mode) +@c @fnindex rememalign + + @node Resizing memory allocations @section Resizing memory allocations @@ -763,6 +822,87 @@ can be passed to @code{free}, is returned. In the @command{slibc} implementation, @code{NULL} is returned, and thus, the behaviour is also identical to that of @code{free}. +@end table + +@hfindex{slibc-alloc.h} +@command{slibc} provides a number of additional +methods for memory management. These are defined +in the header file @file{<slibc-alloc.h>}. They +are available even if @code{_SLIBC_SOURCE} is not +defined, but it is required that neither +@code{_PORTABLE_SOURCE} nor @code{_LIBRARY_HEADER} +is defined. + +@table @code +@item void* crealloc(void* ptr, size_t size) +@fnindex crealloc +This function is similar to @code{realloc}, +but it clears the disowned area when the allocation +shrinks, clears the old allocation when a new +allocation is created, and zero-initialises the +newly available memory when the allocation has +grown. + +@item void* fast_realloc(void* ptr, size_t size) +@fnindex fast_realloc +This function is similar to @code{realloc}, +but it does not clear the disowned area when the +allocation shrinks, it does not clears the old +allocation when a new allocation is created, +and does not zero-initialise the newly available +memory when the allocation has grown. The +operating system kernel may still clear the +disowned memory area or the old allocation. + + +@item void* secure_realloc(void* ptr, size_t size) +@fnindex secure_realloc +This function is similar to @code{realloc}, +but it clears the disowned area when the allocation +shrinks, clears the old allocation when a new +allocation is created, but does not zero-initialise +the newly available memory when the allocation has +grown. + +@item void* custom_realloc(void* ptr, size_t size, int clear_old, int clear_new, int clear_free) +@fnindex custom_realloc +This function is similar to @code{realloc}, but +@itemize @bullet{} +@item +if @code{clear_old} is non-zero, the disowned area +of the allocation is clear, if the allocation has +shrunk, +@item +if @code{clear_new} is non-zero, the newly available +memory is not zero-initialised, if the allocation has +grown, and +@item +if @code{clear_free} is non-zero, the old allocation +is cleared, if a new allocation is created. +@end itemize +The operating system kernel may still clear the +disowned memory area or the old allocation, if +the parameters specifies that the memory should +not be cleared. + +@item void* extalloc(void* ptr, size_t size, enum extalloc_mode mode) +@fnindex extalloc +TODO + +@item void* naive_realloc(void* ptr, size_t boundary, size_t size) +@fnindex naive_realloc +TODO + +@item void* naive_extalloc(void* ptr, size_t size) +@fnindex naive_extalloc +TODO + +@item void* falloc(void* ptr, size_t* ptrshift, size_t boundary, size_t old_size, size_t new_size, enum falloc_mode mode) +@fnindex falloc +@cpindex Memory alignment +@cpindex Pointer alignment +@cpindex Aligned pointers +TODO @end table |