Jeff King <p...@peff.net> writes:

> +     /*
> +      * If non-zero, send error messages to this descriptor rather
> +      * than stderr. The descriptor is closed before check_connected
> +      * returns.
> +      */
> +     int err_fd;

Theoretically speaking it may be possible that a caller may want to
write to fd#0 if it closed the standard input before creating the
output channel for multiplexing into a sideband, but I think this
design strikes a good balance between the theoretical correctness
and usability.  Using err_fd == -1 as "no redirect" may allow the
caller to redirect the errors to fd#0, but that forces normal users
to explicitly set this field to -1.
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