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MREMAP(2)                     System Calls Manual                    MREMAP(2)

     mremap - re-map a virtual memory address

     Standard C Library (libc, -lc)

     #include <sys/mman.h>

     void *
     mremap(void *oldp, size_t oldsize, void *newp, size_t newsize,
         int flags);

     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.

     MAP_REMAPDUP       Duplicate the mapping.  Both address ranges reference
                        the same pages, but can have different protection

     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

     mmap(2), munmap(2)

     The mremap() system call appeared in NetBSD 5.0.  It was based on the
     code that supports mremap() compatibility for Linux binaries.

NetBSD 8.0                      April 28, 2017                      NetBSD 8.0