Duy Nguyen <pclo...@gmail.com> writes:

> On Fri, Aug 9, 2013 at 11:29 PM, Andres Perera <andre...@zoho.com> wrote:
>> On Thu, Aug 8, 2013 at 6:35 AM, Nguyễn Thái Ngọc Duy <pclo...@gmail.com> 
>> wrote:
>>> +       uintmax_t pid;
>> pid_t is always an signed type, therefore unintmax_t does not make
>> sense as a catch all value
> I only catch real process id. In practice we don't have processes with
> negative pid_t, do we? I can't find any document about this, but at
> least waitpid seems to treat negative pid (except -1) just as an
> indicator while the true pid is the positive counterpart.

Negative pids are used for denoting process groups in various
interfaces.  No process can have a negative pid.


Andreas Schwab, sch...@linux-m68k.org
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