Manual Reference Pages - MINHERIT (2)
- control the inheritance of pages
minherit void *addr size_t len int inherit
changes the specified pages to have the inheritance characteristic
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.
is capable of adjusting inheritance characteristics on a page basis.
Inheritance only effects children created by
It has no effect on
execd processes replace their address space entirely.
This system call also
has no effect on the parents address space (other than to potentially
share the address space with its children).
Inheritance is a rather esoteric feature largely superseded by the
However, it is possible to use
to share a block of memory between parent and child that has been mapped
That is, modifications made by parent or child are shared but
the original underlying file is left untouched.
This option causes the address space in question to be shared between
parent and child.
It has no effect on how the original underlying backing
store was mapped.
This option prevents the address space in question from being inherited
The address space will be unmapped in the child.
This option causes the child to inherit the address space as copy-on-write.
This option also has an unfortunate side effect of causing the parent
address space to become copy-on-write when the parent forks.
If the original mapping was
it will no longer be shared in the parent
after the parent forks and there is no way to get the previous
shared-backing-store mapping without unmapping and remapping the address
space in the parent.
.Rv -std minherit
system call will fail if:
The virtual address range specified by the
arguments is not valid.
The flags specified by the
argument were not valid for the pages specified
system call first appeared in
and then in
.Fx 2.2 .
Once you set inheritance to
there is no way to recover the original copy-on-write semantics
short of unmapping and remapping the area.
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