FreeBSD/Linux Kernel Cross Reference
sys/drivers/log/kputc.c

     /* A server must occasionally print some message.  It uses a simple version of 
      * printf() found in the system library that calls putk() to output characters.
      * The LOG driver cannot use the regular putk().  Hence, it uses a special
      * version of putk() that directly sends to the TTY task. 
      *
      * Changes:
      *      21 July 2005:   Created  (Jorrit N. Herder)
      */
     
    #include "log.h"
    
    /*===========================================================================*
     *                              kputc                                        *
     *===========================================================================*/
    void kputc(c)
    int c;
    {
    /* Accumulate another character.  If 0 or buffer full, print it. */
      static int buf_count;         /* # characters in the buffer */
      static char print_buf[80];    /* output is buffered here */
      message m;
    
      if ((c == 0 && buf_count > 0) || buf_count == sizeof(print_buf)) {
            m.DIAG_BUF_COUNT = buf_count;
            m.DIAG_PRINT_BUF = print_buf;
            m.DIAG_PROC_NR = SELF;
            m.m_type = DIAGNOSTICS;         /* request TTY to output this buffer */
            _sendrec(TTY_PROC_NR, &m);      /* if it fails, we give up */ 
            buf_count = 0;                  /* clear buffer for next batch */
      }
      if (c != 0) {
            print_buf[buf_count++] = c;
      }
    }
    

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