[SunHELP] Testing File Descriptor Limits

[Jarrett Carver]

The problem is in 2.6 & 2.7(32Bit) stdio and select system calls:

stdio(3S):
     The integer constant FOPEN_MAX specifies the minimum  number
     of  files  that  the  implementation  guarantees can be open
     simultaneously. Note that no more  than  255  files  may  be
     opened  using  fopen(),  and only file descriptors 0 through
     255 can be used in a stream.

select(3c):
     The default value for FD_SETSIZE (currently 1024) is  larger
     than  the  default limit on the number of open files.  It is
     not possible to increase the size of the  fd_set  data  type
     when used with select().

Ran across this on a Remedy Server a while back. And it doesn't "bark", that 
would have been nice, instead remedy just failed with "can't open.." errors.

This is basically fixes in Solaris 8 & 7(64Bit). The limit for the 64bit 
kernel on these two parameters is something like 65540. If you need to open 
more than 256 files in the 32Bit 2.6 or 2.7 you would need to use 
non-streams based call.


Jarrett Carver           http://www.geocities.com/solarboyz1
solarboyz1 at hotmail.com   Unix/NT Systems Administrator
___________________________________________________________
"When people sigh 'Life is hard', I am always tempted to
ask 'compared to what?'".
               - Sydney Harris
____________________________________________________________





>From: Matthew Hattersley <MatthewHattersley at businessserve.co.uk>
>To: "'sunhelp at sunhelp.org'" <sunhelp at sunhelp.org>
>Subject: [SunHELP] Testing File Descriptor Limits
>Date: Tue, 15 Apr 2003 10:39:46 +0100
>
>Does anyone have a script lying around for testing file desciptor limits.
>
>I have set my limits to:
>
>Hard Limit: 4096
>Soft Limit: 1024
>
>Obviously considering that Solaris 2.6 lies about this and reports that it
>does have a FDL of whatever hoever if it is above 256 (I think) it barks
>when this limit is reached. Solaris 2.8 is supposed to fix this, but I 
>don't
>trust it. I imagine its just a file open script thingy, but writing the
>script is another matter.
>
>Cheers in Advance.
>
>Mat
>
>-----Original Message-----
>From: Matthew Hattersley
>Sent: 15 April 2003 10:10
>To: 'sunhelp at sunhelp.org'
>Subject: RE: [SunHELP] Force a user to reset his/her password when
>he/she logs in for th e first time.
>
>
>you could set their shell to a shell script that runs passwd then usermod 
>to
>change there shell to sh or whatever.
>
>-----Original Message-----
>From: Meng, Andrew [mailto:Andrew.Meng at capitalone.com]
>Sent: 14 April 2003 16:47
>To: 'sunhelp at sunhelp.org'
>Subject: [SunHELP] Force a user to reset his/her password when he/she
>logs in for th e first time.
>
>
>Hello,
>
>If I create a new id from commend line instead of using admintool, how can 
>I
>force the user to reset password when he/she logs in for the first time?
>
>Thanks!
>Andrew
>
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