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Old 03-16-2006, 08:23 AM   #1
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Access to /var/log/messages

I want to write an application that gets, periodically, the new messages written to /var/log/messages (and other log files in the same directory). I want the application to run in user mode. The problem is that this file can be opened only in su mode.
Is there any system call (or another option) that gets the new messages in user mode ?
Old 03-16-2006, 08:31 AM   #2
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You can create a script that runs as root (aka "in su mode")--or you can change the permissions on the file in question.
Old 03-17-2006, 07:54 AM   #3
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I tried it and it works
Old 03-19-2006, 01:49 AM   #4
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I can't change file permission

It appears that I can't change the permissions of files in /var/log. I prefer not to write any script (or small program) in root mode so I tried to use the system call syslog (syslog(3, bufp, len) but it returned always 0 bytes. I tried it as a root and as a user (though in the man page it is written that syslog(3, ...) can be activated also in user mode).
Should I do any other action besides calling to this system call ? Is there another system call that can be used in user mode ?
Old 03-19-2006, 01:55 AM   #5
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In Debian, if you add a user to group: adm, they have read access to /var/log files


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