3cc092ff06
now used for printing diagnostic messages through the kernel message buffer. this lets processes print diagnostics without sending messages to tty and log directly, simplifying the message protocol a lot and reducing difficulties with deadlocks and other situations in which diagnostics are blackholed (e.g. grants don't work). this makes DIAGNOSTICS(_S), ASYN_DIAGNOSTICS and DIAG_REPL obsolete, although tty and log still accept the codes for 'old' binaries. This also simplifies diagnostics in several servers and drivers - only tty needs its own kputc() now. . simplifications in vfs, and some effort to get the vnode references right (consistent) even during shutdown. m_mounted_on is now NULL for root filesystems (!) (the original and new root), a less awkward special case than 'm_mounted_on == m_root_node'. root now has exactly one reference, to root, if no files are open, just like all other filesystems. m_driver_e is unused.
92 lines
2.6 KiB
C
Executable File
92 lines
2.6 KiB
C
Executable File
/* This file contains a collection of miscellaneous procedures:
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* minix_panic: abort MINIX due to a fatal error
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* kprintf: (from lib/sysutil/kprintf.c)
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* kputc: buffered putc used by kernel kprintf
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*/
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#include "kernel.h"
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#include "proc.h"
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#include <unistd.h>
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#include <signal.h>
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#include <string.h>
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#include <minix/sysutil.h>
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#include <minix/sys_config.h>
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/*===========================================================================*
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* panic *
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*===========================================================================*/
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PUBLIC void panic(what, mess,nr)
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char *what;
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char *mess;
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int nr;
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{
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/* This function is for when a library call wants to panic.
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* The library call calls printf() and tries to exit a process,
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* which isn't applicable in the kernel.
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*/
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minix_panic(mess, nr);
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}
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/*===========================================================================*
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* minix_panic *
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*===========================================================================*/
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PUBLIC void minix_panic(mess,nr)
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char *mess;
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int nr;
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{
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/* The system has run aground of a fatal kernel error. Terminate execution. */
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if (minix_panicing ++) return; /* prevent recursive panics */
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if (mess != NULL) {
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kprintf("kernel panic: %s", mess);
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if(nr != NO_NUM)
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kprintf(" %d", nr);
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kprintf("\n");
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}
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kprintf("kernel stacktrace: ");
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util_stacktrace();
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/* Abort MINIX. */
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minix_shutdown(NULL);
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}
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/* Include system printf() implementation named kprintf() */
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#define printf kprintf
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#include "../lib/sysutil/kprintf.c"
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/*===========================================================================*
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* kputc *
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*===========================================================================*/
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PUBLIC void kputc(c)
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int c; /* character to append */
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{
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/* Accumulate a single character for a kernel message. Send a notification
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* to the output driver if an END_OF_KMESS is encountered.
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*/
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if (c != END_OF_KMESS) {
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if (do_serial_debug) {
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if(c == '\n')
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ser_putc('\r');
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ser_putc(c);
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}
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kmess.km_buf[kmess.km_next] = c; /* put normal char in buffer */
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if (kmess.km_size < sizeof(kmess.km_buf))
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kmess.km_size += 1;
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kmess.km_next = (kmess.km_next + 1) % _KMESS_BUF_SIZE;
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} else {
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int p, outprocs[] = OUTPUT_PROCS_ARRAY;
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if(do_serial_debug) return;
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if(minix_panicing || do_serial_debug) return;
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for(p = 0; outprocs[p] != NONE; p++) {
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if(isokprocn(outprocs[p]) && !isemptyn(outprocs[p])) {
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send_sig(outprocs[p], SIGKMESS);
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}
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}
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}
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}
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