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NAME
malloc - a memory allocator
SYNOPSIS
#include <stdlib.h> void *malloc(size_t size);
DESCRIPTION
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 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 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() , 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 .