From: Duy Nguyen Date: Sat, 10 Aug 2013 00:45:38 GMT Subject: Re: [PATCH v4] gc: reject if another gc is running, unless --force is given Message-ID: In-Reply-To: On Fri, Aug 9, 2013 at 11:29 PM, Andres Perera wrote: > On Thu, Aug 8, 2013 at 6:35 AM, Nguyễn Thái Ngọc Duy 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. > fork() returns -1 on failure, and its return type is pid_t. i don't > know what fantasy unix system has an unsigned pid_t -- Duy