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Document protection bits.

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PR:		46252
Submitted by:	Jeroen Ruigrok van der Werven <asmodai@wxs.nl>
This commit is contained in:
Tom Rhodes 2002-12-23 19:25:03 +00:00
parent a58e485d36
commit 3c094e54a7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=108230
1 changed files with 16 additions and 0 deletions
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16
lib/libc/sys/mprotect.2
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@ -52,6 +52,22 @@ changes the specified pages to have protection
.Fa prot .
Not all implementations will guarantee protection on a page basis;
the granularity of protection changes may be as large as an entire region.
A region is the virtual address space defined by the start
and end addresses of a
.Vt "struct vm_map_entry" .
.Pp
Currently these protection bits are known,
which can be combined, OR'd together:
.Bl -tag width "PROT_WRITE"
.It PROT_NONE
No permissions at all.
.It PROT_READ
The pages can be read.
.It PROT_WRITE
The pages can be written.
.It PROT_EXEC
The pages can be executed.
.El
.Sh RETURN VALUES
.Rv -std mprotect
.Sh ERRORS