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posix_memalign requires incorrect constraints on its arguments

From: Steven G. Johnson
Subject: posix_memalign requires incorrect constraints on its arguments
Date: Fri, 13 Sep 2002 22:36:14 -0400 (EDT)

According to:


as well as glibc's own documentation, the posix_memalign(&buf,size,align)
function requires its ALIGN argument to be a power-of-two multiple of

However, looking in the glibc-2.2.5 source (malloc/malloc.c),
posix_memalign actually does:

  /* Test whether the SIZE argument is valid.  It must be a power of
     two multiple of sizeof (void *).  */
  if (size % sizeof (void *) != 0 || (size & (size - 1)) != 0)
    return EINVAL;

i.e. it constrains the SIZE argument instead of the ALIGN argument!  The
fix is, of course, trivial.

Thanks for your great work and perseverence on this important library; I
apologize if this bug has already been reported/fixed.

Steven G. Johnson

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