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bsdmalloc(3malloc)
Memory Allocation Library Functions bsdmalloc(3MALLOC)
NAME
bsdmalloc - memory allocator
SYNOPSIS
cc [ flag ... ] file ... -lbsdmalloc [ library ... ]
#include <stdlib.h>
void *malloc(size_t size);
void *calloc(size_t nelem, size_t elsize);
void *memalign(size_t alignment, size_t size);
void *realloc(void *ptr, size_t size);
void *valloc(size_t size);
size_t malloc_usable_size(void *ptr);
void free(void *ptr);
DESCRIPTION
These routines provide a general-purpose memory allocation package.
They maintain a table of free blocks for efficient allocation and coa‐
lescing of free storage. When there is no suitable space already free,
the allocation routines call sbrk(2) to get more memory from the sys‐
tem. Each of the allocation routines returns a pointer to space suit‐
ably aligned for storage of any type of object. Each returns a null
pointer if the request cannot be completed.
They operate as described on the malloc(3C) manual page, except for the
following differences:
o For historical backward compatibility, realloc() accepts a
pointer to a block freed since the most recent call to one
of the allocation functions.
o Support for using adi(7) is not available.
o Entry points for memalign() and valloc() are empty routines
that return failure, and are provided only to protect the
user from mixing malloc() functions from different implemen‐
tations. This will also cause calls to aligned_alloc(3C) and
posix_memalign(3C) to fail.
USAGE
Using realloc() with a block freed before the most recent call to mal‐
loc(), calloc(), or realloc() results in an error.
See malloc(3C) for an overview and comparison of all the allocation
libraries provided by Oracle Solaris.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelUnsafe
SEE ALSO
brk(2), malloc(3C), libbsdmalloc(3LIB)
WARNINGS
Use of libbsdmalloc renders an application non-SCD compliant.
The libbsdmalloc routines must not be mixed with other malloc implemen‐
tations within a single process. Such use is undefined and may cause
corruption or other failure.
Oracle Solaris 11.4 11 May 2021 bsdmalloc(3MALLOC)