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MALLOC(P) POSIX Programmer's Manual MALLOC(P)
malloc - a memory allocator
void *malloc(size_t size);
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 unspeci-
fied. 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.
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.
The malloc() function shall fail if:
ENOMEM Insufficient storage space is available.
The following sections are informative.
calloc() , free() , realloc() , the Base Definitions volume of IEEE Std 1003.1-2001,
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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 MALLOC(P)
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