source: trunk/minix/commands/elle/eeerr.c@ 12

/* ELLE - Copyright 1982, 1987 by Ken Harrenstien, SRI International
 *      This software is quasi-public; it may be used freely with
 *      like software, but may NOT be sold or made part of licensed
 *      products without permission of the author.
 */
/*      EEERR - Error handling & testing routines
 */

#include "elle.h"

#if V6
#include "eesigs.h"
#else
#include <signal.h>
#endif

/* EFUN: "Hit Breakpoint" */
f_bkpt()
{       clean_exit();
        bpt();
        set_tty();
}
bpt() {}                /* Put a DDT/ADB breakpoint here */


#if !(STRERROR)         /* If strerror() not supported, we provide it. */
extern int sys_nerr;            /* Max index into sys_errlist */
extern char *sys_errlist[];

char *
strerror(num)
int num;
{
        static char badbuf[30];
        if (num > 0 && num <= sys_nerr)
                return (sys_errlist[num]);
        sprintf(badbuf, "unknown error %d", num);
        return badbuf;
}
#endif /* -STRERROR */



errsbm(type,adr,str,a0,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12)
register int type;      /* Type, flags */
int (*adr)();           /* Addr called from */
char *str;              /* Printf string */
{       register struct buffer *b;
        int oldttystate;

        oldttystate = clean_exit();     /* Ensure not in editing mode */
        if(type == SBFERR)      /* File overwrite error?  A0 is FD */
          {     printf("WARNING - FILE CORRUPTED!\nBuffers affected:\n");
                for(b = buf_head; b; b = b->b_next)
                  {     if(sb_fdinp((SBBUF *)b, a0))
                                printf((b->b_fn ? "  %s: %s\n" : "  %s\n"),
                                        b->b_name, b->b_fn);
                  }
                if (oldttystate > 0) set_tty();
                return(1);      /* Try to continue normally */
          }
        printf("%sERR: %o ", (type ? "SBX" : "SBM"), adr);
        printf(str,a0,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12);
        askerr();
}

/*
 *  Bite_bag -- Try to save our rear ends after a catastrophe.
 *      This routine is mainly called from "interrupt"
 *      level when a memory fault or bus error occurs.
 *      We try to save the buffer to the file "ELLE.crash"
 *      in the current working directory.  If it loses, well
 *      then you have really lost.  Note: this routine does
 *      not reset the appropriate signal handler, so it is
 *      never re-entered.  If a fault repeats once in this
 *      code, then the world dies.
 */

bite_bag(fault)                         /* We come here on any memory error */
int fault;
{
        int ostate;
        /* Some systems, such as BSD4.x and SUN, do not reset caught signals
         * to SIG_DFL.
         * This is a win, but isn't what vanilla UNIX code expects.
         * Since it doesn't hurt to do it explicitly, we always turn it off
         * explicitly...
         */
        signal(fault, SIG_DFL);         /* Reinstate default handling */

        ostate = clean_exit();          /* Fix up the terminal modes first! */
        printf("ELLE stopped by fatal interrupt (%d)!\n\
Type S or W to try saving your work.\n",fault);
        askerr();
        if(ostate > 0) set_tty();
        signal(fault, bite_bag);        /* If continued, re-enable signal */
}

/* HUP_EXIT - Called by a SIGHUP hangup signal.
 *      Tries to save all modified buffers before exiting.
 *      Note that the TTY is not touched at all, although the terminal mode
 *      flag is set just in case further error handling routines are invoked.
 */
hup_exit()
{       extern int trm_mode;            /* See e_disp.c */

        trm_mode = -1;                  /* Say TTY is now detached */
        saveworld((struct buffer *)0, 0);       /* Save world, w/o feedback */
        exit(1);
}


errint()                /* Routine provided for ADB jumps */
{       askerr();
}
char askh1[] = "\
A - Abort process\n\
B - Breakpoint (must have \"bpt:b\" set in ADB)\n\
C - Continue\n\
D - Diagnostic command mode\n";
char askh2[] = "\
S - Try to save current buffer\n\
W - Try to save world (all modified buffers)\n";

int bsaving = 0;        /* Set while in middle of saving buffer(s) */

askerr()
{       register struct buffer *b;
        char linbuf[100];
        char *asklin();
        extern int (*funtab[])();       /* In E_CMDS.C */
        int ostate;

        ostate = clean_exit();          /* Clean up TTY if not already done */
reask:
        printf("(A,B,C,D,S,W,?)");
        switch(upcase(*asklin(linbuf)))
          {
                case '?':
                        writez(1,askh1);        /* Too long for &$@! printf */
                        writez(1,askh2);        /* Too long for &$@! V6 C */
                        break;                  /*    optimizer (/lib/c2) */
                case 'A':
                        abort();
                        break;
                case 'B':
                        bpt();
                        break;
                case 'Q':
                case 'C':
                        goto done;
                case 'D':
                        if(funtab[FN_DEBUG])
                                (*funtab[FN_DEBUG])(-1);
                        else printf("Sorry, no diagnostics\n");
                        break;
                case 'S':       /* Try to save current buffer only */
                        b = cur_buf;
                        goto savb;
                case 'W':       /* Try to save all modified buffers */
                        b = 0;
                savb:   if(bsaving++)
                          {     printf("Already saving -- continued");
                                goto done;
                          }
                        saveworld(b, 1);        /* Save, with feedback */
                        bsaving = 0;
                        break;
          }
        goto reask;
done:
        if(ostate > 0)
                set_tty();
}

char *
asklin(acp)
char *acp;
{       register char *cp;
        register int c;
        cp = acp;
        while((c = tgetc()) != LF)
                *cp++ = c;
        *cp++ = 0;
        return(acp);
}