The
mremap() function resizes the mapped range (see
mmap(2)) starting at
oldp and having size
oldsize to
newsize. The following arguments can be
OR'ed together in the
flags argument:
MAP_ALIGNED(n)
The allocation should be aligned to the given boundary, i.e. ensure that the lowest
n bits of the address are zero. The parameter
n should be the base 2 logarithm of the desired alignment (e.g., to request alignment to 16K, use 14 as the value for n). The alignment must be equal to or greater than the platform's page size as returned by
sysconf(3) with the
_SC_PAGESIZE request.
MAP_FIXED
newp is tried and mremap() fails if that address can't be used as new base address for the range. Otherwise, oldp and newp are used as hints for the position, factoring in the given alignment.