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Re: write() not retried after EINTR in printf and echo

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  Re: write() not retried after EINTR in printf and echo Bize Ma <binaryzebra@gmail.com> - 2018-12-19 22:15 -0500

#14930 — Re: write() not retried after EINTR in printf and echo

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

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