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Top Forums UNIX for Dummies Questions & Answers Syslog Messages from Remote Server are not writing to Log File Anymore Post 302919044 by bakunin on Saturday 27th of September 2014 05:08:47 AM
Old 09-27-2014
Quote:
Originally Posted by mrm5102
But that's good to know. I assume you could use that for most daemons that are running?
Absolutely. Whenever you want to delete a file which might be written to by a running process instead of "rm file" use

Code:
cat /dev/null > /path/to/file

which will shorten it to 0 bytes length but retain the inode. The result is the same file with its contents removed instead of a new file with the same name as the old one.

If a program honors a signal depends on how it was written. "Well-behaving" programs (that is: ones which are written like Unix programs are meant to be written) do so, but not every programmer adheres to some informal standard. You will have to find out for every specific program yourself if it is the case or not.

I hope this helps.

bakunin
 

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Logger::Syslog(3pm)					User Contributed Perl Documentation				       Logger::Syslog(3pm)

NAME
Logger::Syslog -- an intuitive wrapper over Syslog for Perl DESCRIPTION
You want to deal with syslog, but you don't want to bother with Sys::Syslog, that module is for you. Logger::Syslog takes care of everything regarding the Syslog communication, all you have to do is to use the function you need to send a message to syslog. Logger::Syslog provides one function per Syslog message level: debug, info, warning, error, notice, critic, alert. NOTES
Logger::Syslog is compliant with mod_perl, all you have to do when using it in such an environement is to call logger_init() at the beginning of your CGI, that will garantee that everything will run smoothly (otherwise, issues with the syslog socket can happen in mod_perl env). SYNOPSIS
use Logger::Syslog; info("Starting at ".localtime()); ... if ($error) { error("An error occured!"); exit 1; } ... notice("There something to notify"); FUNCTIONS
logger_init Call this to explicitly open a Syslog socket. You can optionaly specify a Syslog facility. That function is called when you use the module, if you're not in a mod_perl environement. Examples: # open a syslog socket with default facility (user) logger_init(); # open a syslog socket on the 'local' facility logger_init('local'); logger_close Call this to close the Syslog socket. That function is called automatically when the calling program exits. logger_prefix That function lets you set a string that will be prefixed to every messages sent to syslog. Example: logger_prefix("my program"); info("starting"); ... info("stopping"); logger_set_default_facility(facility) You can choose which facility to use, the default one is "user". Use that function if you want to switch smoothly from a facility to another. That function will close the existing socket and will open a new one with the appropriate facility. Example: logger_set_default_facility("cron"); LOGGING
Logger::Syslog provides one function per Syslog level to let you send messages. If you want to send a debug message, just use debug(), for a warning, use warning() and so on... All those function have the same signature : thay take a string as their only argument, which is the message to send to syslog. Examples: debug("my program starts at ".localtime()); ... warning("some strange stuff occured"); ... error("should not go there !"); ... notice("Here is my notice"); LICENSE
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. COPYRIGHT
This program is copyright X 2004-2006 Alexis Sukrieh AUTHOR
Alexis Sukrieh <sukria@sukria.net> Very first versions were made at Cegetel (2004-2005) ; Thomas Parmelan gave a hand for the mod_perl support. perl v5.12.4 2006-11-27 Logger::Syslog(3pm)
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