[H-GEN] /dev/log inside a chroot

[James McPherson - Solution Centre Engineer]

[ Humbug *General* list - semi-serious discussions about Humbug and ]
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David Jericho wrote:
>
> A lot of applications obviously write to /dev/log as opposed to using udp 
> based syslog logging.  But inside a chroot, the new /dev/log isn't the 
> same as the old /dev/log that syslog has opened.
> 
> How do I go about fixing this? That is, getting the chrooted version of 
> /dev/log to work?

I'm not up to date wrt linux atm, but under solaris 2.6 and above you have to 
write your own syslog routines because syslog logging under chrooted environment 
is not supported. This is due to the door file /etc/.syslog_door not being 
linkable (ln -s) to another fs. The three functions which you need to dummy up 
(and compile to .so then use LD_PRELOAD) are

void openlog(const char *ident, int logopt, int facility);
void syslog(int priority, const char *message, ... /* arguments */);
void closelog(void);

how close to SysV is linux these days when it comes to syslog?

cheers,
James


--
Solution Centre Engineer              828 Pacific Highway 
Sun Microsystems Australia Pty Ltd    Gordon NSW 2072
             Support Helpline: 1-800-555-786



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