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MALLOC(3P)                 POSIX Programmer's Manual                MALLOC(3P)
PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
NAME
       malloc -- a memory allocator
SYNOPSIS
       #include <stdlib.h>
       void *malloc(size_t size);
DESCRIPTION
       The functionality described on this reference page is aligned with  the
       ISO C  standard.  Any  conflict between the requirements described here
       and the ISO C standard is unintentional. This  volume  of  POSIX.1-2008
       defers to the ISO C standard.
       The  malloc()  function shall allocate unused space for an object whose
       size in bytes is specified by size and whose value is unspecified.
       The order and contiguity of storage allocated by  successive  calls  to
       malloc()  is  unspecified.  The pointer returned if the allocation suc-
       ceeds 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 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 points 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 size not equal  to  0,  malloc()  shall
       return  a  pointer  to the allocated space. If size is 0, either a null
       pointer or a unique pointer 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 malloc() function shall fail if:
       ENOMEM Insufficient storage space is available.
       The following sections are informative.
EXAMPLES
       None.
APPLICATION USAGE
       None.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       calloc(), free(), getrlimit(), posix_memalign(), realloc()
       The Base Definitions volume of POSIX.1-2008, <stdlib.h>
COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal and Electronics Engineers,  Inc  and  The  Open  Group.   (This  is
       POSIX.1-2008  with  the  2013  Technical Corrigendum 1 applied.) 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.unix.org/online.html .
       Any  typographical  or  formatting  errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files  to  man page format. To report such errors, see https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                           MALLOC(3P)