Tcl_Alloc - Tcl_Alloc, Tcl_Free, Tcl_Realloc, Tcl_AttemptAlloc, Tcl_AttemptRealloc, allocate or free heap memory
#include <tcl.h> char * Tcl_Alloc(size) void Tcl_Free(ptr) char * Tcl_Realloc(ptr, size) char * Tcl_AttemptAlloc(size) char * Tcl_AttemptRealloc(ptr, size) char * ckalloc(size) void ckfree(ptr) char * ckrealloc(ptr, size) char * attemptckalloc(size) char * attemptckrealloc(ptr, size)
Tcl_Alloc(3tcl) Tcl Library Procedures Tcl_Alloc(3tcl) ______________________________________________________________________________ NAME Tcl_Alloc, Tcl_Free, Tcl_Realloc, Tcl_AttemptAlloc, Tcl_AttemptRealloc, ckalloc, ckfree, ckrealloc, attemptckalloc, attemptckrealloc - allocate or free heap memory SYNOPSIS #include <tcl.h> char * Tcl_Alloc(size) void Tcl_Free(ptr) char * Tcl_Realloc(ptr, size) char * Tcl_AttemptAlloc(size) char * Tcl_AttemptRealloc(ptr, size) char * ckalloc(size) void ckfree(ptr) char * ckrealloc(ptr, size) char * attemptckalloc(size) char * attemptckrealloc(ptr, size) ARGUMENTS unsigned int size (in) Size in bytes of the memory block to allocate. char *ptr (in) Pointer to memory block to free or realloc. ______________________________________________________________________________ DESCRIPTION These procedures provide a platform and compiler independent interface for memory allocation. 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 provided by the C run-time library. Tcl_Alloc returns a pointer to a block of at least size bytes suitably aligned for any use. Tcl_Free makes the space referred to by ptr available for further allo- cation. 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 functions 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 implemented as macros. Normally, they are syn- onyms 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. KEYWORDS alloc, allocation, free, malloc, memory, realloc, TCL_MEM_DEBUG ATTRIBUTES See attributes(7) for descriptions of the following attributes: +---------------+------------------+ |ATTRIBUTE TYPE | ATTRIBUTE VALUE | +---------------+------------------+ |Availability | runtime/tcl-8 | +---------------+------------------+ |Stability | Uncommitted | +---------------+------------------+ NOTES Source code for open source software components in Oracle Solaris can be found at https://www.oracle.com/downloads/opensource/solaris-source- code-downloads.html. This software was built from source available at https://github.com/oracle/solaris-userland. The original community source was downloaded from http://prdownloads.sourceforge.net/tcl/tcl- core8.6.7-src.tar.gz. Further information about this software can be found on the open source community website at https://www.tcl.tk/. Tcl 7.5 Tcl_Alloc(3tcl)