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CALLOC(3P)                 POSIX Programmer's Manual                CALLOC(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
       calloc - a memory allocator

SYNOPSIS
       #include <stdlib.h>

       void *calloc(size_t nelem, size_t elsize);


DESCRIPTION
       The calloc() function shall allocate unused space for an array of nelem elements each of whose size in bytes is
       elsize. The space shall be initialized to all bits 0.

       The order and contiguity of storage allocated by successive calls  to  calloc()  is  unspecified.  The  pointer
       returned  if  the  allocation succeeds shall be suitably aligned so that it may be assigned to a pointer to any
       type of object and then used to access such an object or an array of such objects in the space allocated (until
       the space is explicitly freed or reallocated). Each such allocation shall yield a pointer to an object disjoint
       from any other object. The pointer returned shall point to the start (lowest byte  address)  of  the  allocated
       space.  If  the space cannot be allocated, a null pointer shall be returned. If the size of the space requested
       is 0, the behavior is implementation-defined: the value returned shall be either a null  pointer  or  a  unique
       pointer.

RETURN VALUE
       Upon  successful  completion  with both nelem and elsize non-zero, calloc() shall return a pointer to the allo-
       cated space. If either nelem or elsize is 0, then either a null pointer or a unique pointer value that  can  be
       successfully  passed  to  free() shall be returned. Otherwise, it shall return a null pointer  and set errno to
       indicate the error.

ERRORS
       The calloc() function shall fail if:

       ENOMEM Insufficient memory is available.


       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
       free(), 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                           CALLOC(3P)