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manual: mention PKEY_UNRESTRICTED macro in the manual 

Also use this macro in one of the examples.

Reviewed-by: Florian Weimer <fweimer@redhat.com>
This commit is contained in:
Yury Khrustalev 2025-05-27 11:10:12 +01:00
parent 22419a2b60
commit ea30c67030
1 changed files with 4 additions and 4 deletions
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8
manual/memory.texi
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@ -3139,7 +3139,7 @@ used to temporarily acquire access to the memory region and relinquish
it again: it again:
@smallexample @smallexample
if (key >= 0 && pkey_set (key, 0) < 0) if (key >= 0 && pkey_set (key, PKEY_UNRESTRICTED) < 0)
...; /* Perform error checking (generally fatal). */ ...; /* Perform error checking (generally fatal). */
/* At this point, the current thread has read-write access to the /* At this point, the current thread has read-write access to the
memory region. */ memory region. */
@ -3256,9 +3256,9 @@ not @math{-1}.
@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}} @safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
Change the access restrictions of the current thread for memory pages with Change the access restrictions of the current thread for memory pages with
the protection key @var{key} to @var{access_restrictions}. If the protection key @var{key} to @var{access_restrictions}. If
@var{access_restrictions} is zero, no additional access restrictions on top of @var{access_restrictions} is @code{PKEY_UNRESTRICTED} (zero), no additional
the page protection flags are applied. Otherwise, @var{access_restrictions} is access restrictions on top of the page protection flags are applied. Otherwise,
a combination of the following flags: @var{access_restrictions} is a combination of the following flags:
@vtable @code @vtable @code
@item PKEY_DISABLE_READ @item PKEY_DISABLE_READ