bug#80380: [patch]sort: make sighandler async-signal-safe

On 2026-02-10 23:06, 左洪盛 wrote:
>     From d52984cc2e356797789deb221a637f5cf5890107 Mon Sep 17 00:00:00 2001
>     From: Zuo <[email protected]>
>     Date: Wed, 11 Feb 2026 14:16:38 +0800
>     Subject: [PATCH] sort: make sighandler async-signal-safe
> 
>     * src/sort.c (main,sighandler): Make sighandler async-signal-safe
>     by removing non-async-signal-safe calls from signal handler.
>     Use SA_RESETHAND flag and call unlink() directly.

I don't see why this patch is needed; on the contrary, it seems to 
introduce a bug.

Currently, the signal handler of 'sort' uses only the system calls 
'unlink', 'signal', and 'raise', all of which are async-signal-safe. So 
the patch does not make 'sort' any more async-signal-safe than it 
already is.

There is no need to call '_exit', as 'raise' causes a signal to be 
delivered, which causes the program to exit.

Using SA_RESETHAND would introduce a race condition bug, as a signal 
could arrive during signal handling and this would kill the process, 
which means temporary files would not be cleaned up.