MREMAP(2) BSD System Calls Manual MREMAP(2)NAMEmremap — 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 bound‐
ary, i.e. ensure that the lowest n bits of the address
are zero. The parameter n should be the base 2 loga‐
rithm 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 plat‐
form'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, fac‐
toring in the given alignment.
RETURN VALUESmremap() 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 ALSOmmap(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