FREE(P) POSIX Programmer's Manual FREE(P)
free - free allocated memory
void free(void *ptr);
The free() function shall cause the space pointed to by ptr to be deallocated; that is,
made available for further allocation. If ptr is a null pointer, no action shall occur.
Otherwise, if the argument does not match a pointer earlier returned by the calloc(), mal-
loc(), posix_memalign(), realloc(), or strdup() function, or if the space has been
deallocated by a call to free() or realloc(), the behavior is undefined.
Any use of a pointer that refers to freed space results in undefined behavior.
The free() function shall not return a value.
No errors are defined.
The following sections are informative.
There is now no requirement for the implementation to support the inclusion of <malloc.h>.
calloc() , malloc() , realloc() , the Base Definitions volume of IEEE Std 1003.1-2001,
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System
Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by
the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and The Open Group
Standard, the original IEEE and The Open Group Standard is the referee document. The orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 FREE(P)