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Re: read() may fail due to nonblocking stdin

From: Chet Ramey
Subject: Re: read() may fail due to nonblocking stdin
Date: Mon, 23 Jan 2017 10:42:38 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:45.0) Gecko/20100101 Thunderbird/45.6.0

On 1/22/17 2:32 PM, Siteshwar Vashisht wrote:
> If a child process sets stdin to non-blocking and does not set it back to 
> blocking before exiting, other processes may fail to read from stdin.

It's not the shell's business to be resetting this for processes it spawns.
What bash should do is to turn of O_NONBLOCK when it reads input, which it
already does at startup but not every time it calls readline().

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

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