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newbie: C-Program write to /var/log/mylog via syslog

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newbie: C-Program write to /var/log/mylog via syslog

 
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Dec 16th, 2007
I have a C program I am writing and need this program to write to syslog and have the logs in a separate file for my program.

Eg. My program is called "example.c", then I want to have a log file called "example.log" in /var/log. Do I define log file "example.log"in syslogd.conf file?
Or have the C-Program to write to this file via syslog?

I want to have the message in the format yyyy/mm/dd 24HR:MMS LOG_TYPE: MESSAGE

I need to have date and time in format yyyy/mm/dd 24HR:MMS. Log_type is an severity of error. and MESSAGE is acutal error message.

Any suggestions in doing this in C?
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Re: newbie: C-Program write to /var/log/mylog via syslog

 
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Dec 16th, 2007
Look for C file operations and also how to get the system date. A little googling will do.
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Re: newbie: C-Program write to /var/log/mylog via syslog

 
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Dec 17th, 2007
Do you really want your operating system to do the logging? Or do you only need a file created with log entries in it?
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Re: newbie: C-Program write to /var/log/mylog via syslog

 
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Dec 17th, 2007
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Originally Posted by WaltP View Post
Do you really want your operating system to do the logging? Or do you only need a file created with log entries in it?
WaltP I am pretty curious to know now, how would you make OS to log things for. As far i know it should have done by programmer itself isn't Or... am i going wrong somewhere

ssharish
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Re: newbie: C-Program write to /var/log/mylog via syslog

 
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Dec 17th, 2007
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Originally Posted by ssharish2005 View Post
WaltP I am pretty curious to know now, how would you make OS to log things for. As far i know it should have done by programmer itself isn't Or... am i going wrong somewhere
Only in your explanation. You said "I have a C program I am writing and need this program to write to syslog..." Syslog means system log, the log file for the system and I was simply wondering if you really meant what you said.

When you need to log a message, call a function that uses sprintf() to put the message together. Open the file, write the message, close the file.
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Re: newbie: C-Program write to /var/log/mylog via syslog

 
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Dec 17th, 2007
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Originally Posted by WaltP View Post
Only in your explanation. You said "I have a C program I am writing and need this program to write to syslog..." Syslog means system log, the log file for the system and I was simply wondering if you really meant what you said.

When you need to log a message, call a function that uses sprintf() to put the message together. Open the file, write the message, close the file.
Sorry i dint say that, perhaps u confused between the OP and me. I just question u. So there no feature in the OS which basically logs any events for the applications, instead we need to write ower own. Thats fine.

Thanks a lot

ssharish
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Re: newbie: C-Program write to /var/log/mylog via syslog

 
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  #7
Dec 17th, 2007
there u go a pesudocode for u

C Syntax (Toggle Plain Text) 
  1. void writetofile(char *log)
  2. {
  3.      open file
  4.      check file open status
  5.  
  6.      build the log message with time and append the *log using sprintf
  7.  
  8.      write log to file
  9.  
  10.      close file
  11. }

ssharish
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Re: newbie: C-Program write to /var/log/mylog via syslog

 
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Dec 17th, 2007
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Originally Posted by WaltP View Post
Do you really want your operating system to do the logging? Or do you only need a file created with log entries in it?
I just want pass it to syslogd to do the logging in a separate file.
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Re: newbie: C-Program write to /var/log/mylog via syslog

 
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  #9
Dec 18th, 2007
Then you need to look up how syslogd works. Google for it.
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