minix/drivers/log/kputc.c
Jorrit Herder b69ca94efb Fixed 'bug' in log driver that caused kernel messages not to be displayed.
This was caused by a change in the shared driver code. Not log's fault.

Renamed #definitions of driver process numbers, e.g., TTY now is TTY_PROC_NR.
All known (special) processes now have consistent naming scheme. Kernel tasks
don't follow this scheme.
2005-08-03 08:14:08 +00:00

36 lines
1.1 KiB
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;
}
}