MREMAP(2) System Calls Manual MREMAP(2)
mremap -- re-map a virtual memory address
Standard C Library (libc, -lc)
mremap(void *oldp, size_t oldsize, void *newp, size_t newsize, int
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.
mremap() returns the new address or MAP_FAILED, if the remap failed.
The semantics of mremap() differ from the one provided by glibc on Linux
in that the newp argument was added and a different set of flags are
The mremap() system call appeared in NetBSD 5.0. It was based on the
code that supports mremap() compatibility for Linux binaries.
NetBSD 6.1.5 February 14, 2008 NetBSD 6.1.5