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Man Pages
VM_MAP_INHERIT(9) FreeBSD Kernel Developer's Manual VM_MAP_INHERIT(9)

vm_map_inherit
set fork inheritance flags for a range within a map

#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_map.h>
int
vm_map_inherit(vm_map_t map, vm_offset_t start, vm_offset_t end, vm_inherit_t new_inheritance);

The vm_map_inherit() function sets the inheritance flags for the range start to end within the target map to the value new_inheritance.
The new_inheritance flag must have one of the values VM_INHERIT_NONE, VM_INHERIT_COPY, or VM_INHERIT_SHARE. This affects how the map will be shared with child maps when the associated process forks.

The vm_map_inherit() function obtains a lock on the map using vm_map_lock(9) for the duration of the function.

The vm_map_inherit() function returns KERN_SUCCESS if the inheritance flags could be set. Otherwise, if the provided flags were invalid, KERN_INVALID_ARGUMENT will be returned.

fork(2)

This manual page was written by Bruce M Simpson <bms@spc.org>.
July 19, 2003 FreeBSD 12.0-RELEASE

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