Linux Certif

Toute la documentation sur la certification Linux LPI

vm_map_find.9freebsd

BSD mandoc

NAME

vm_map_find - find a free region within a map, and optionally map a vm_object

SYNOPSIS

In sys/param.h In vm/vm.h In vm/vm_map.h Ft int Fo vm_map_find Fa vm_map_t map vm_object_t object vm_ooffset_t offset Fa vm_offset_t *addr vm_size_t length boolean_t find_space Fa vm_prot_t prot vm_prot_t max int cow Fc  

DESCRIPTION

The Fn vm_map_find function attempts to find a free region in the target Fa map , with the given Fa length , and will also optionally create a mapping of Fa object .

The arguments Fa offset , Fa prot , Fa max , and Fa cow are passed unchanged to vm_map_insert9 when creating the mapping, if and only if a free region is found.

If Fa object is non- NULL the reference count on the object must be incremented by the caller before calling this function to account for the new entry.

If Fa find_space is TRUE the function will call vm_map_findspace9 to discover a free region.

IMPLEMENTATION NOTES

This function acquires a lock on Fa map by calling vm_map_lock9, and holds it until the function returns.

The search for a free region is defined to be first-fit, from the address Fa addr onwards.

RETURN VALUES

The Fn vm_map_find function returns KERN_SUCCESS if space for the mapping could be found and the mapping was successfully created. If space could not be found in the map, KERN_NO_SPACE will be returned. If the discovered range turned out to be bogus, KERN_INVALID_ADDRESS will be returned.

SEE ALSO

vm_map9, vm_map_findspace9, vm_map_insert9, vm_map_lock9

AUTHORS

This manual page was written by An Bruce M Simpson Aq bms@spc.org .