FreeBSD Manual Pages
MREMAP(2) 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 bound- ary, i.e. ensure that the lowest n bits of the ad- dress are zero. The parameter n should be the base 2 logarithm of the desired alignment (e.g., to re- quest 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. HISTORY The mremap() system call appeared in NetBSD 5.0. It was based on the code that supports mremap() compatibility for Linux binaries. 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) GNU February 14, 2008 MREMAP(2)
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | HISTORY | COMPATIBILITY | SEE ALSO
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=mremap&manpath=NetBSD+5.0>