09830fc33e
kernel) to the log driver. The log driver forwards such output to the TTY. Changed driver_task() not to send a reply if the return value is EDONTREPLY.
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
/* A server must occasionally print some message. It uses a simple version of
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* printf() found in the system library that calls putk() to output characters.
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* The LOG driver cannot use the regular putk(). Hence, it uses a special
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* version of putk() that directly sends to the TTY task.
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*
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* Changes:
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* 21 July 2005: Created (Jorrit N. Herder)
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*/
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#include "log.h"
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/*===========================================================================*
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* kputc *
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*===========================================================================*/
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void kputc(c)
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int c;
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{
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/* Accumulate another character. If 0 or buffer full, print it. */
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static int buf_count; /* # characters in the buffer */
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static char print_buf[80]; /* output is buffered here */
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message m;
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if ((c == 0 && buf_count > 0) || buf_count == sizeof(print_buf)) {
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m.DIAG_BUF_COUNT = buf_count;
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m.DIAG_PRINT_BUF = print_buf;
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m.DIAG_PROC_NR = SELF;
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m.m_type = DIAGNOSTICS; /* request TTY to output this buffer */
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_sendrec(TTY, &m); /* if it fails, we cannot do better */
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buf_count = 0; /* clear buffer for next batch */
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}
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if (c != 0) {
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print_buf[buf_count++] = c;
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}
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}
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