man free () - free allocated memory
NAME
free - free allocated memory
SYNOPSIS
#include <stdlib.h>
void free(void *ptr);
DESCRIPTION
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(), malloc(), 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.
RETURN VALUE
The free() function shall not return a value.
ERRORS
No errors are defined.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
There is now no requirement for the implementation to support the inclusion of <malloc.h>.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
calloc() , malloc() , realloc() , the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>
COPYRIGHT
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 original Standard can be obtained online at http://www.opengroup.org/unix/online.html .