PR/57946 CVS commit: src/tests/lib/libc/setjmp

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

The following reply was made to PR lib/57946; it has been noted by GNATS.

From: "Taylor R Campbell" <riastradh%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/57946 CVS commit: src/tests/lib/libc/setjmp
Date: Mon, 19 Feb 2024 13:34:48 +0000

 Module Name:	src
 Committed By:	riastradh
 Date:		Mon Feb 19 13:34:48 UTC 2024
 
 Modified Files:
 	src/tests/lib/libc/setjmp: t_sigstack.c
 
 Log Message:
 longjmp(3) t_sigstack: Use a sigaltstack per handler entry.
 
 longjmp evidently doesn't reset the state of whether the process is
 executing on the alternate signal stack.  So when we re-enter the
 signal handler, the alternate stack appears to be still in use, and
 the system chooses the original stack for the second call to the
 signal handler -- which trips our assertion asking to verify that the
 signal handler is always using an alternate stack.
 
 Not strictly necessary for the signal handler to use an alternate
 stack on re-entry, but this makes it clearer that the signal handler
 itself is always using the alternate stack so we can verify that the
 interrupted code is _not_ in the signal handler.
 
 With this change, the test now passes on aarch64.
 
 PR lib/57946
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.5 -r1.6 src/tests/lib/libc/setjmp/t_sigstack.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.