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From: Bize Ma <binaryzebra@gmail.com>
Newsgroups: gnu.bash.bug
Subject: Re: write() not retried after EINTR in printf and echo
Date: Wed, 19 Dec 2018 22:15:27 -0500
Lines: 23
Approved: bug-bash@gnu.org
Message-ID: <mailman.5984.1545275742.1284.bug-bash@gnu.org>
References: <CAFra36hm9XcAgwqr7Yp_giX+kiSEp__x4Mc5Qn=eqgUdSdLA7Q@mail.gmail.com> <eefa8e88-104a-1fd3-b505-a279778ba291@case.edu>
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Cc: bug-bash <bug-bash@gnu.org>
To: Chester Ramey <chet.ramey@case.edu>
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In-Reply-To: <eefa8e88-104a-1fd3-b505-a279778ba291@case.edu>
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Chet Ramey (<chet.ramey@case.edu>) wrote:

> And yet, when you look at the source, the signal handlers are installed
> with SA_RESTART. For example,
>


> #  if defined (SIGWINCH)
>   act.sa_flags = (sig == SIGWINCH) ? SA_RESTART : 0;
> #  else
>   act.sa_flags = 0;
> #  endif /* SIGWINCH */
>
> in lib/readline/signals.c:rl_set_sighandler().
>
>
True for SIGWINCH, but "write error: Interrupted system call"
is still exposed to users (which it shouldn't) for other signals:

{   pid=$BASHPID; trap : USR1;
    (sleep 1; kill -USR1 "$pid") &
    printf %0100000d 1;
} | sleep 20