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Re: snprintf(3) and friends async-signal safety?
In article <40e6c1df0b22de00d955dd4820d56018%helkyn.dyndns.org@localhost>,
Jean-Yves Migeon <jeanyves.migeon%free.fr@localhost> wrote:
> Hi list,
> While working on my msgfmt thingy for dd(1) , I found that
> snprintf(3) gets used in summary(), which is a function that can be
> called via the SIGINFO handler.
> Unfortunately, I am not quite certain of what I read; a quick look at
> snprintf(3) code in libc/stdio makes me believe that the function is
> _not_ async signal safe (it is not listed in signal(7) either), but is
> still used in as-is in dd(1).
> Question is: is it really safe to use it in a signal handler inside
It is not and this is why we have vsnprintf_ss() but that does not handle
floating point formats.
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