Library /sys$common/syshlp/helplib.hlb  —  CRTL  free  Description
    The ANSI C standard defines free as not returning a value;
    therefore, the function prototype for free is declared with
    a return type of void. However, since a free can fail, and
    since previous versions of the Compaq C RTL have declared free
    to return an int, the implementation of free does return 0 on
    success and -1 on failure.
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