netbsd man page for mremap

MREMAP(2)						      BSD System Calls Manual							 MREMAP(2)

NAME
     mremap -- re-map a virtual memory address

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/mman.h>

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

DESCRIPTION
     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.

RETURN VALUES
     mremap() returns the new address or MAP_FAILED, if the remap failed.

COMPATIBILITY
     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
     implemented.

SEE ALSO
     mmap(2), munmap(2)

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

BSD
								 February 14, 2008							       BSD