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mprotect.2: Remove legacy BSD text

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This text dates to the BSD 4.4 import and is misleading.  The mprotect
syscall acts on page granularity and breaks up mappings as required to
do so.

Note that with the addition of non-transparent superpages (aka
largepages) the size of a page at a given address may vary.  This
commit does not attempt to address the lack of documentation of this
feature.

Sponsored by:	DARPA

Reviewed by:	alc, mckusick, imp, kib, markj
Differential Revision:	https://reviews.freebsd.org/D31776
This commit is contained in:
Brooks Davis 2021-09-03 19:30:23 +01:00
parent 9895a2073f
commit e51b29b5a9
1 changed files with 1 additions and 6 deletions
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7
lib/libc/sys/mprotect.2
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@ -28,7 +28,7 @@
.\" @(#)mprotect.2 8.1 (Berkeley) 6/9/93
.\" $FreeBSD$
.\"
.Dd February 26, 2020
.Dd September 3, 2021
.Dt MPROTECT 2
.Os
.Sh NAME
@ -46,11 +46,6 @@ The
system call
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: