vm_map_protect (9)

Leading comments

Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
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(The comments found at the beginning of the groff file "man9/vm_map_protect.9freebsd".)

NAME

vm_map_protect - apply protection bits to a virtual memory region

SYNOPSIS

In sys/param.h In vm/vm.h In vm/vm_map.h Ft int Fo vm_map_protect Fa vm_map_t map vm_offset_t start vm_offset_t end vm_prot_t new_prot Fa boolean_t set_max Fc

DESCRIPTION

The Fn vm_map_protect function sets the protection bits of the address region bounded by Fa start and Fa end within the map Fa map to Fa new_prot .

If Fa set_max is TRUE, Fa new_prot is treated as the new max_protection setting for each underlying entry. Otherwise, only the protection field is affected.

The range MUST be contiguous, and MUST NOT contain sub-maps.

IMPLEMENTATION NOTES

The function acquires a lock on the Fa map for the duration, by calling vm_map_lock9.

RETURN VALUES

The Fn vm_map_protect function returns KERN_SUCCESS if the protection bits could be set successfully.

If a sub-map entry was encountered in the range, KERN_INVALID_ARGUMENT is returned. If the value of Fa new_prot would exceed max_protection for an entry within the range, KERN_PROTECTION_FAILURE is returned.

SEE ALSO

vm_map9

AUTHORS

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