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printk ()
  • >> printk (9) ( Linux man: Ядро )
  •  

    NAME

    printk - print messages to console log
     
    

    SYNOPSIS

    #include <linux/kernel.h>

    int printk(const char*fmt, ...)  

    DESCRIPTION

    Print a formatted message to the kernel console, much like the printf function of the stdio library. Normally, the message is written to the physical console device of the computer, although this behavior can be changed with the register_console function. Messages are also stored in a message log book.

    The generated string may also start with a message priority code, which sets the priority of the message. The priority code strings are of the form <n> where n is a number from 0 - 7. The following macros are defined in the <linux/kernel.h> header file:

    KERN_EMERG
    System is unuseable
    KERN_ALERT
    Action must be taken immediately
    KERN_CRIT
    Critical conditions
    KERN_ERR
    Error conditions
    KERN_WARNING
    Warning conditions
    KERN_NOTICE
    Normal but significant condition
    KERN_INFO
    Informational
    KERN_DEBUG
    Debug-level messages

    For example

    
            printk(KERN_NOTICE "Hello, world.\n");
    
    
    does the expected thing.  

    RETURN VALUE

    Returns the number of characters written to the log.  

    AVAILABILITY

    Linux 1.0+  

    SEE ALSO

    register_console(9), syslog(2)

    kernel/printk.c  

    AUTHOR

    Stephen Williams (steve@icarus.com)  

    BUGS

    float and double formats are not supported. Floats and doubles do not belong inside the kernel anyhow.

    The printk implementation protects itself from interruption, so in principle it can be used in interrupts handlers and critical sections. However, there are no guarantees about the console function that is registered.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    AVAILABILITY
    SEE ALSO
    AUTHOR
    BUGS


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