minix/kernel/utility.c

92 lines
2.6 KiB
C
Executable file

/* This file contains a collection of miscellaneous procedures:
* minix_panic: abort MINIX due to a fatal error
* kprintf: (from lib/sysutil/kprintf.c)
* kputc: buffered putc used by kernel kprintf
*/
#include "kernel.h"
#include "proc.h"
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <minix/sysutil.h>
#include <minix/sys_config.h>
/*===========================================================================*
* panic *
*===========================================================================*/
PUBLIC void panic(what, mess,nr)
char *what;
char *mess;
int nr;
{
/* This function is for when a library call wants to panic.
* The library call calls printf() and tries to exit a process,
* which isn't applicable in the kernel.
*/
minix_panic(mess, nr);
}
/*===========================================================================*
* minix_panic *
*===========================================================================*/
PUBLIC void minix_panic(mess,nr)
char *mess;
int nr;
{
/* The system has run aground of a fatal kernel error. Terminate execution. */
if (minix_panicing ++) return; /* prevent recursive panics */
if (mess != NULL) {
kprintf("kernel panic: %s", mess);
if(nr != NO_NUM)
kprintf(" %d", nr);
kprintf("\n");
}
kprintf("kernel stacktrace: ");
util_stacktrace();
/* Abort MINIX. */
minix_shutdown(NULL);
}
/* Include system printf() implementation named kprintf() */
#define printf kprintf
#include "../lib/sysutil/kprintf.c"
#define END_OF_KMESS 0
/*===========================================================================*
* kputc *
*===========================================================================*/
PUBLIC void kputc(c)
int c; /* character to append */
{
/* Accumulate a single character for a kernel message. Send a notification
* to the output driver if an END_OF_KMESS is encountered.
*/
if (c != END_OF_KMESS) {
if (do_serial_debug) {
if(c == '\n')
ser_putc('\r');
ser_putc(c);
}
kmess.km_buf[kmess.km_next] = c; /* put normal char in buffer */
if (kmess.km_size < sizeof(kmess.km_buf))
kmess.km_size += 1;
kmess.km_next = (kmess.km_next + 1) % _KMESS_BUF_SIZE;
} else {
int p, outprocs[] = OUTPUT_PROCS_ARRAY;
if(minix_panicing || do_serial_debug) return;
for(p = 0; outprocs[p] != NONE; p++) {
if(isokprocn(outprocs[p]) && !isemptyn(outprocs[p])) {
send_sig(outprocs[p], SIGKMESS);
}
}
}
}