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Re: [Nmh-workers] Applying alias file , to Reply-To: and From: component
From: |
Ken Hornstein |
Subject: |
Re: [Nmh-workers] Applying alias file , to Reply-To: and From: components of a draft |
Date: |
Tue, 11 Nov 2014 22:25:44 -0500 |
>That's fine, but wasn't my first attempt.
>
> $ whom <(echo To: me)
> whom: unable to open /dev/fd/63: No such file or directory
> $
I'm unclear on what should really be happening here, as I'm not familiar
with that syntax.
Okay, I just read up on it. Huh, didn't know about that.
>whom forks and close(2)s file descriptors [3, 255] along the way,
>trampling 63. Is this `close all the file descriptors' approach still
>needed with more modern facilities like O_CLOEXEC? Can nmh just take
>care to ensure file descriptors it opens that shouldn't cross execve(2)
>are marked to be closed on exec? It shouldn't bother itself with all
>file descriptors?
... yeah, I have to agree with you there. I think by now all library
calls that create file descriptors should be setting the close-on-exec
flag, right? That's been around forever. Although I'm not sure
O_CLOEXEC has been around forever, has it? I know the fcntl()
equivalent has. We should go through and audit all open() calls and set
the FD_CLOEXEC flag where appropriate.
>(Is 255 fixed? File descriptors can run far higher on some systems, and
>closing them all can take time, e.g. Apache used to suffer from this.
>The BSDs added http://manned.org/closefrom.2 to lessen the calls, but it
>still tramples willy-nilly.)
It looks like it's based on OPEN_MAX ... which is kind of bogus.
--Ken
- [Nmh-workers] Applying alias file , to Reply-To: and From: components of a draft, norm, 2014/11/11
- Re: [Nmh-workers] Applying alias file , to Reply-To: and From: components of a draft, Ken Hornstein, 2014/11/11
- Re: [Nmh-workers] Applying alias file , to Reply-To: and From: components of a draft, Ralph Corderoy, 2014/11/11
- Re: [Nmh-workers] Applying alias file , to Reply-To: and From: components of a draft,
Ken Hornstein <=
- Re: [Nmh-workers] Applying alias file , to Reply-To: and From: components of a draft, norm, 2014/11/13
- Re: [Nmh-workers] Applying alias file , to Reply-To: and From: components of a draft, Ken Hornstein, 2014/11/13
- Re: [Nmh-workers] Applying alias file , to Reply-To: and From: components of a draft, norm, 2014/11/14
- Re: [Nmh-workers] Applying alias file , to Reply-To: and From: components of a draft, Ken Hornstein, 2014/11/14
- Re: [Nmh-workers] Applying alias file , to Reply-To: and From: components of a draft, norm, 2014/11/14