From owner-freebsd-questions  Fri Mar 15  1:45:14 2002
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Date: Fri, 15 Mar 2002 01:44:53 -0800 (PST)
From: Greg Quinlan <gwq_uk@yahoo.com>
Reply-To: gwq_uk@yahoo.com
Subject: Fwd: IBCS2 / SCO binary fork PID limitation.
To: David Banning <david@skytrackercanada.com>
Cc: FreeBSD-Questions@FreeBSD.org
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Hi All,

Firstly, how can I submit this to FreeBSD-bugs?

David, I know it has been a long time since you submitted the issue you had ...

Thu, 12 Jul 2001 02:05:39 -0500 which was;
> "Well this one may be a tough one.
>
> I am running an SCO binary which is relational database.
> 
> I runs fine normally under ibcs2, but a couple of larger programs I run
> crash _only_ when I select a large number of records to process......"
> 

But if you read this below it may have helped you back then.

> Subject: IBCS2 binary fork PID limitation.
> Date: Thu, 14 Mar 2002 11:27:32 -0000
> 
> Problem:
> 	COFF (IBCS2) binaries from SCO UNIX (running on FreeBSD 4.5-S)
> 	that fork processes, have an upper PID (process ID) limitation.
> 	The fork-ed PID can only be a maximum of 32767, but FreeBSD 4.5-S
> 	allows 99999!
> 
> Details:
> 	short = ( 2^16, -1 bit for sign, +/- 2^15) = ~ 32768 
> 
> 	From the command prompt on the lastest fully patched version of
> 	SCO UNIX Open Server R5.0.X
> 
> 	sco# grep pid /usr/include/sys/proc.h
>         	short           p_pid;          /* unique process id*/
>         	short           p_ppid;         /* process id of parent*/
>         	short           p_epid;         /* effective pid; normally
> 					
> 	It appears that any SCO (IBCS2) binary process that "forks a child"
>       and exceeds the upper limit of "short" will return the error "can't
>       fork process" or "can not fork process", and crash.
> 
> 	eg. If the PID returned by fork() is say, 41000, then the effective
> 	"cast" to (short)pid will give an incorrect value for the child
>       process.
> 
> Work around:
> 	Edit /sys/sys/proc.h, change 
> 
> 	#define PID_MAX     99999
> 	#define NO_PID      100000
> 
> 	to 32767 and 32768, rebuild your kernel, and reboot.
> 
> 	(courtesy of FreeBSD-Questions)
> 
> Severity:
> 	Low


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