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Date: Sun, 14 Sep 2014 11:09:25 +0200
Message-ID: <CAEhDDbAk8iSeG6CaSDBY8o-DLUUd+xJaATDbP=rBG9qUfFLe+A@mail.gmail.com>
Subject: Re: Cannot exec() program outside of /bin if PATH is unset
From: Csaba Raduly <rcsaba AT gmail DOT com>
To: cygwin list <cygwin AT cygwin DOT com>
Content-Type: text/plain; charset=ISO-8859-1

On Fri, Sep 12, 2014 at 9:33 PM, Eric Blake  wrote:
> On 09/12/2014 11:02 AM, Christian Franke wrote:
(snip)
>>
>> int main()
>> {
>>   unsetenv("PATH");
>
> This is undefined behavior, per POSIX.  POSIX recommends that you always
> leave PATH defined to at least a bare minimum of the results of
> confstr(_CS_PATH, ...); it also states that implementations are free to
> do what they want (in this case, crash) if you don't follow the
> recommendation:
>
> http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html
> "If PATH is unset or is set to null, the path search is
> implementation-defined."

Nitpick: undefined != implementation-defined

Csaba
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