mapmalloc man page on SmartOS

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MAPMALLOC(3MALLOC)					    MAPMALLOC(3MALLOC)

NAME
       mapmalloc - memory allocator

SYNOPSIS
       cc [ flag ... ] file ... -lmapmalloc [ library ... ]
       #include <stdlib.h>

       void *malloc(size_t size);

       void *calloc(size_t nelem, size_t elsize);

       void free(void * ptr);

       void *realloc(void *ptr, size_t size);

DESCRIPTION
       The collection of malloc functions in this library use  mmap(2) instead
       of sbrk(2) for acquiring new heap space.	 The functions in this library
       are  intended to be used only if necessary, when applications must call
       sbrk(), but need to call other library routines that might call malloc.
       The algorithms used by these functions are not sophisticated.  There is
       no reclaiming of memory.

       The malloc() and free() functions provide a simple general-purpose mem‐
       ory allocation package.

       The  malloc()  function	returns	 a pointer to a block of at least size
       bytes suitably aligned for any use.

       The argument to free() is a pointer to a block previously allocated  by
       malloc(),  calloc()  or realloc(). If  ptr is a NULL pointer, no action
       occurs.

       Undefined results will occur if the space assigned by malloc() is over‐
       run or if some random number is handed to free().

       The calloc() function allocates space for an array of nelem elements of
       size elsize. The space is initialized to zeros.

       The realloc() function changes the size of the block pointed to by  ptr
       to  size bytes and returns a pointer to the (possibly moved) block. The
       contents will be unchanged up to the lesser of the new and  old	sizes.
       If  the new size of the block requires movement of the block, the space
       for the previous instantiation of the block is freed. If the  new  size
       is larger, the contents of the newly allocated portion of the block are
       unspecified. If ptr is NULL, realloc() behaves like  malloc()  for  the
       specified  size.	 If size is 0 and ptr is not a null pointer, the space
       pointed to is freed.

       Each of the allocation functions returns a pointer  to  space  suitably
       aligned	(after	possible  pointer coercion) for storage of any type of
       object.

       The malloc() and realloc() functions will fail if there is  not	enough
       available memory.

       Entry  points  for  malloc_debug(), mallocmap(), mallopt(), mallinfo(),
       memalign(), and valloc() are empty routines, and are provided  only  to
       protect	the  user from mixing malloc() functions from different imple‐
       mentations.

RETURN VALUES
       If there is no available	 memory,  malloc(),  realloc(),	 and  calloc()
       return  a  null pointer. When realloc() returns NULL, the block pointed
       to by ptr is left intact. If size, nelem, or  elsize  is	 0,  a	unique
       pointer to the arena is returned.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌───────────────┬─────────────────┐
       │ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
       ├───────────────┼─────────────────┤
       │MT-Level       │ Safe		 │
       └───────────────┴─────────────────┘

SEE ALSO
       brk(2),	  getrlimit(2),	   mmap(2),    realloc(3C),   malloc(3MALLOC),
       attributes(5)

				 Feb 20, 2004		    MAPMALLOC(3MALLOC)
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