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stack(7): Clarify thread stack guard vs program stack guard. 

Just in case this confuses anyone dealing with PR pkg/57708.

XXX pullup-10
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riastradh 2023-11-23 21:27:08 +00:00
parent 001acc2f8e
commit 623621d665
1 changed files with 6 additions and 1 deletions
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7
share/man/man7/stack.7
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@ -1,4 +1,4 @@
.\" $NetBSD: stack.7,v 1.1 2023/11/23 21:20:49 riastradh Exp $
.\" $NetBSD: stack.7,v 1.2 2023/11/23 21:27:08 riastradh Exp $
.\"
.\" Copyright (c) 2023 The NetBSD Foundation, Inc.
.\" All rights reserved.
@ -243,6 +243,11 @@ guardsize is the value of the
.Li vm.guard_size
.Xr sysctl 7
knob at the time of program startup.
(Note that this means the
.Xr pthread 3
view of the main thread's stack guard may not coincide with the actual
stack guard \(em it may overlap with, or lie entirely in, the
inaccessible pages of the stack reserved on program start.)
However, if the program changes its soft stack rlimit with
.Xr setrlimit 2 ,
this snapshot may become stale.