Controls how
calloc(),
malloc(),
and
realloc()
behave if you specify a size of 0 (or a value of
0 for the n argument to calloc()).
The V ("System V") and R
("use the realloc() behavior of QNX Neutrino 6.4.0
and earlier") columns below indicate how the
functions behave if the value of MALLOC_OPTIONS
includes that letter:
| Function
|
Default
|
V
|
R
|
| calloc(n, 0)
|
Non-NULL
|
NULL
|
No effect
|
| malloc(0)
|
Non-NULL
|
NULL
|
No effect
|
| realloc(NULL, 0)
|
Non-NULL
|
NULL
|
No effect
|
| realloc(non-NULL, 0)
|
Non-NULL
|
NULL
|
NULL
|
In all the above cases, if the function returns a non-NULL
pointer, it's valid only for a corresponding call to
free()
or realloc().