Re: size of pid_t (was: Re: NR_TASKS as config option)

Matthew Wilcox (Matthew.Wilcox@genedata.com)
Mon, 14 Jun 1999 11:08:38 +0200

On Sun, Jun 13, 1999 at 08:47:08PM +0200, Andries.Brouwer@cwi.nl wrote:
> #define PID_MAX 0x8000
> in <linux/tasks.h>, and at first sight not much goes wrong
> if we pick some larger number for PID_MAX, like 0x7fffffff.
> (There are some comparisons around, so for simplicity we should
> keep PID_MAX positive.)

Also, a negative pid_t is used to represent the process group in some
calls, notably the SIOCSPGRP and SIOCGPGRP ioctls.

-- 
Matthew Wilcox <willy@bofh.ai>
"Windows and MacOS are products, contrived by engineers in the service of
specific companies. Unix, by contrast, is not so much a product as it is a
painstakingly compiled oral history of the hacker subculture." - N Stephenson


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