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FREE(3P)                   POSIX Programmer's Manual                  FREE(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

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 fur-
       ther 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, Stan-
       dard  for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
       tions 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 Stan-
       dard, 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 .



IEEE/The Open Group                  2003                             FREE(3P)