DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 633983858D37
Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3731.700.6.1.1\))
Subject: Re: Bogus exit code 127 from a child process
In-Reply-To: <8F45EC6F-A035-449B-89D0-065FAE3FC157@unified-streaming.com>
Date: Sun, 17 Mar 2024 14:10:55 +0100
Cc: cygwin@cygwin.com
Message-Id: <259F0ECF-9AE8-42E7-A746-8227F8B7870C@unified-streaming.com>
References: <d5c90ec69060cea65c9eb31492a655ac@ispras.ru>
 <20240317174402.4a3e73a7fca2f5978ac93913@nifty.ne.jp>
 <61d4fca73047915567fc9b4aac2860a3@ispras.ru>
 <20240317182757.84b41a596c344f395c1d8f9a@nifty.ne.jp>
 <c587acce90e624992471b392c1f0e171@ispras.ru>
 <20240317192116.b00f24c9ee065f16d6ac6673@nifty.ne.jp>
 <20240317210358.ad701873dc5cfc9a3026dc0c@nifty.ne.jp>
 <20240317211517.40cfbe0a664f7c7fe3d6e73d@nifty.ne.jp>
 <20240317213548.652be777a51f00108414d9bf@nifty.ne.jp>
 <8F45EC6F-A035-449B-89D0-065FAE3FC157@unified-streaming.com>
To: Takashi Yano <takashi.yano@nifty.ne.jp>
Precedence: list
From: Dimitry Andric via Cygwin <cygwin@cygwin.com>
Reply-To: Dimitry Andric <dimitry@unified-streaming.com>
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Errors-To: cygwin-bounces+archive-cygwin=delorie.com@cygwin.com
Sender: "Cygwin" <cygwin-bounces+archive-cygwin=delorie.com@cygwin.com>

On 17 Mar 2024, at 13:50, Dimitry Andric <dimitry@unified-streaming.com> wrote:
> 
> On 17 Mar 2024, at 13:35, Takashi Yano via Cygwin <cygwin@cygwin.com> wrote:
> ...
>> 
>> I also test your test case:
>> while bash -c 'true & true & wait -n || { echo 1: $?; exit 1; } && wait -n || { echo 2: $?; exit 1; }'; do echo $((i++)); done
>> in Linux (Debian 12.5), and the issue reproduced!
> 
> Yeah, same here with bash 5.1.16(1)-release on Ubuntu 22.04. It errors out with 127 after ~50-200 loops.

Having built bash master (bash-5.2-27-gf3b6bd19) here, it consistently gives 127 in this area:

https://git.savannah.gnu.org/cgit/bash.git/tree/builtins/wait.def#n227

   211  #if defined (JOB_CONTROL)
   212    if (nflag)
   213      {
   214        if (list)
   215          {
   216            opt = set_waitlist (list);
   217            if (opt == 0)
   218              WAIT_RETURN (127);
   219            wflags |= JWAIT_WAITING;
   220          }
   221
   222        status = wait_for_any_job (wflags, &pstat);
   223        if (vname && status >= 0)
   224          builtin_bind_var_to_int (vname, pstat.pid, bindflags);
   225
   226        if (status < 0)
=> 227          status = 127;
   228        if (list)
   229          unset_waitlist ();
   230        WAIT_RETURN (status);
   231      }
   232  #endif

So for some reason, wait_for_any_job() returns a negative value in this particular situation.

-Dimitry


-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple