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@(#)minherit.2 8.1 (Berkeley) 6/9/93
.Dd October 7, 2006 .Dt MINHERIT 2 .Os .Sh NAME .Nm minherit .Nd control the inheritance of pages .Sh LIBRARY .Lb libc .Sh SYNOPSIS n sys/mman.h .Ft int .Fn minherit "void *addr" "size_t len" "int inherit" .Sh DESCRIPTION The .Fn minherit system call changes the specified range of virtual addresses to have the specified fork-time inheritance characteristic .Fa inherit , which can be set to .Dv MAP_INHERIT_NONE , .Dv MAP_INHERIT_COPY , or .Dv MAP_INHERIT_SHARE . Also possible is .Dv MAP_INHERIT_DEFAULT , which defaults to .Dv MAP_INHERIT_COPY . Not all implementations will guarantee that the inheritance characteristic can be set on a page basis; the granularity of changes may be as large as an entire region.
p Normally, the entire address space is marked .Dv MAP_INHERIT_COPY ; when the process calls .Fn fork , the child receives a (virtual) copy of the entire address space. Pages or regions marked .Dv MAP_INHERIT_SHARE are shared between the address spaces, while pages or regions marked .Dv MAP_INHERIT_NONE will be unmapped in the child. .Sh RETURN VALUES .Rv -std minherit .Sh ERRORS .Xr minherit 2 will fail if: l -tag -width Er t Bq Er EINVAL An invalid region was specified, or invalid parameters. .El .Sh SEE ALSO .Xr fork 2 , .Xr madvise 2 , .Xr mincore 2 , .Xr mprotect 2 , .Xr msync 2 , .Xr munmap 2 .Sh HISTORY The .Fn minherit function first appeared in .Ox . .Sh BUGS If a particular port does not support page-granularity inheritance, there's no way to figure out how large a region is actually affected by .Fn minherit .
Indexes created Mon Oct 13 14:09:54 GMT 2025