CentOS 7.0 - man page for tcl_attemptalloc (centos section 3)

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Tcl_Alloc(3)			      Tcl Library Procedures			     Tcl_Alloc(3)


       Tcl_Alloc,  Tcl_Free,  Tcl_Realloc, Tcl_AttemptAlloc, Tcl_AttemptRealloc, ckalloc, ckfree,
       ckrealloc, attemptckalloc, attemptckrealloc - allocate or free heap memory

       #include <tcl.h>

       char *


       char *
       Tcl_Realloc(ptr, size)

       char *

       char *
       Tcl_AttemptRealloc(ptr, size)

       char *


       char *
       ckrealloc(ptr, size)

       char *

       char *
       attemptckrealloc(ptr, size)

       unsigned int size (in)	Size in bytes of the memory block to allocate.

       char *ptr (in)		Pointer to memory block to free or realloc.

       These procedures provide a platform and compiler independent interface for memory  alloca-
       tion.   Programs  that  need  to transfer ownership of memory blocks between Tcl and other
       modules should use these routines rather than the native malloc() and free() routines pro-
       vided by the C run-time library.

       Tcl_Alloc  returns  a  pointer  to a block of at least size bytes suitably aligned for any

       Tcl_Free makes the space referred to by ptr available for further allocation.

       Tcl_Realloc changes the size of the block pointed to by ptr to size bytes  and  returns	a
       pointer	to the new block.  The contents will be unchanged up to the lesser of the new and
       old sizes.  The returned location may be different from ptr.  If  ptr  is  NULL,  this  is
       equivalent to calling Tcl_Alloc with just the size argument.

       Tcl_AttemptAlloc  and  Tcl_AttemptRealloc  are  identical  in  function	to  Tcl_Alloc and
       Tcl_Realloc, except that Tcl_AttemptAlloc and Tcl_AttemptRealloc will not  cause  the  Tcl
       interpreter to panic if the memory allocation fails.  If the allocation fails, these func-
       tions will return NULL.	Note that on some platforms, but not all, attempting to  allocate
       a zero-sized block of memory will also cause these functions to return NULL.

       The procedures ckalloc, ckfree, ckrealloc, attemptckalloc, and attemptckrealloc are imple-
       mented as macros.  Normally, they are synonyms for the corresponding procedures documented
       on  this  page.	 When  Tcl  and  all  modules calling Tcl are compiled with TCL_MEM_DEBUG
       defined, however, these macros are redefined to be special  debugging  versions	of  these
       procedures.  To support Tcl's memory debugging within a module, use the macros rather than
       direct calls to Tcl_Alloc, etc.

       alloc, allocation, free, malloc, memory, realloc, TCL_MEM_DEBUG

Tcl					       7.5				     Tcl_Alloc(3)
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