This is the mail archive of the libc-help@sourceware.org mailing list for the glibc project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: printf before main?

From: "Carlos O'Donell" <carlos at systemhalted dot org>
To: Brendan Miller <catphive at catphive dot net>
Cc: libc-help at sourceware dot org
Date: Tue, 23 Mar 2010 17:52:02 -0400
Subject: Re: printf before main?
References: <ef38762f1003231320i6bcbb54an25c94abc43bf0fe@mail.gmail.com>

On Tue, Mar 23, 2010 at 4:20 PM, Brendan Miller <catphive@catphive.net> wrote:
> Is it safe to call printf family functions, or other streams
> functionality before main? In other words, in global C++ constructors,
> or functions with __attribute__((constructor))?
>
> I'm wondering if any buffers for standard output are being allocated
> during that phase... I need to do some output potentially before main
> for logging purposes, and I'm wondering if I'd better off calling
> write directly.

In general yes. Though I think the C++ standard is ambiguous about the
status of iostreams before main.

Cheers,
Carlos.

References:
- printf before main?
  - From: Brendan Miller

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]