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


From: Chet Ramey
Subject: Re: write() not retried after EINTR in printf and echo
Date: Fri, 12 Jan 2018 12:55:30 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:52.0) Gecko/20100101 Thunderbird/52.5.2

On 1/12/18 12:05 PM, Serge van den Boom wrote:

> Bash Version: 4.4
> Patch Level: 12
> Release Status: release
> 
> Description:
>       If during an 'echo' or 'printf', the write() system call returns an
>       EINTR error, the write() call is not retried.
>       This can can happen when a system call is interrupted when a
>       signal is received, which can happen when the user resized the
>       terminal while the write() call is blocked.

There are a couple of signals for which this is the appropriate behavior.
The right fix is to install handlers with the SA_RESTART flag set. The
next version of bash will install its SIGWINCH handler with SA_RESTART.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://tiswww.cwru.edu/~chet/



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