The following reply was made to PR kern/154915; it has been noted by GNATS.
From: Jeremie Le Hen <[email protected]> To: Oliver Fromme <[email protected]> Cc: [email protected], [email protected] Subject: Re: kern/154915: [libc] [patch] Force stdio output streams to line-buffered mode Date: Thu, 5 Apr 2012 08:55:00 +0200 Hi Oliver, I'm top-posting to let you handle this mail quickly. Can you please close this PR. The content is messy, the subject is misleading and I don't think these points will help the patch to be committed. I will open a new PR with the new patch that doesn't modify libc. Thanks. Regards, On Thu, Feb 16, 2012 at 02:49:50PM +0100, Oliver Fromme wrote: > I think introducing an environment variable for this purpose > is a bad hack. I would advise against this. > > Many tools already have options for unbuffered or line-buffered > output (for example cat -u), and there are also other ways to > circumvent such problems. > > For example, the problem quoted in the PR can be solved like this, > using the -u option of cat: > > $ iostat -x 1 | cat -un | grep ad1 > > or avoiding cat completely (also might be more efficient, > saving one process and one pipe, though I haven't benchmarked > this): > > $ iostat -x 1 | awk '{n+=1} /ad1/{print n, $0}' > > For certain other cases, I have the following alias in my ~/.zshrc > that simulates a TTY environment for a tool so it is forced to > use line-buffered output: > > alias intty='script -qt0 /dev/null' > > So I can write: > > $ intty sometool -args | grep ... > > However, the intty alias only works when it is the first command > in a pipeline (this is a limitation of the "script" command). > In the above example, the cat command is not the first, but a > subshell can be used to work around this: > > $ intty sh -c 'iostat -x 1 | cat -n' | grep ad1 > > (It should work with any shell that supports aliases, not just > zsh, of course.) > > I suggest closing this PR. > > Best regards > Oliver -- Jeremie Le Hen Men are born free and equal. Later on, they're on their own. Jean Yanne _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-bugs To unsubscribe, send any mail to "[email protected]"
