How do I get system answer in c

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dmesg

dmesg(1M)																 dmesg(1M)

NAME

       dmesg - collect system diagnostic messages to form error log

SYNOPSIS

DESCRIPTION

       looks  in  a system buffer for recently printed diagnostic messages and prints them on the standard output.  The messages are those printed
       by the system when unusual events occur (such as when system tables overflow or the system crashes).  If the argument  is  specified,  com-
       putes (incrementally) the new messages since the last time it was run and places these on the standard output.  This is typically used with
       (see cron(1)) to produce the error log by running the command:

       every 10 minutes.

       The arguments and allow substitution for the defaults and where should be a file containing the image of the kernel virtual memory saved by
       the  savecrash(1M)  command  and  should  be  the corresponding kernel.	If the system is booted with a kernel other than /stand/vmunix say
       /stand/vmunix_new, must be passed this name, the command must be,

WARNINGS

       The system error message buffer is of small, finite size.  is run only every few minutes, so there is no guarantee that all error  messages
       will be logged.

AUTHOR

       was developed by the University of California, Berkeley.

FILES

       error log (conventional location)
       memory scratch file for	option
       special file containing the image of kernel virtual memory
       the kernel, system name list

SEE ALSO

       savecrash(1M).

																	 dmesg(1M)

Programming