Inserting arbitrary messages into strace output

[Dmitry V. Levin]

On Thu, Dec 18, 2014 at 10:35:59PM -0500, Justin Dearing wrote:
> Ok, so writing to an invalid descriptor makes sense. However, the line will
> still be decorated with the fact that its a write call. I'd like just the
> message written.
> 
> Or is the negative -1 file descriptor unique and not just a variation on
> this? http://ewontfix.com/10/

Unlike -42, which is treated as unsigned int (i.e. 2^32-42) by the kernel,
-1 is never a valid file descriptor.

BTW, should we change printfd() to print the file descriptor (when it's not
equal to -1) using %u format instead of %d?

> On Thu, Dec 18, 2014 at 10:22 PM, enh <enh at google.com> wrote:
> >
> > already implemented...
> >
> >   write(-1, "GOT HERE", strlen("GOT HERE"));


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