1990/1018/port/devcons.c (diff list | history)

1990/0928/sys/src/9/port/devcons.c:36,50 – 1990/1018/sys/src/9/port/devcons.c:36,50 (short | long | prev | next)
1990/0227		IOQ kbdq; /* qlock to getc; interrupt putc's */ IOQ lineq; /* lock to getc; interrupt putc's */
1990/0928		#define SYSLOGMAGIC 0x23456789 #define SYSLOG ((Syslog *)(UNCACHED | KZERO | 0x1B00))
1990/1018		#define SYSLOGMAGIC 0xdeadbeaf #define SYSLOG ((Syslog *)(UNCACHED | 0x1B00))
1990/0928		typedef struct Syslog Syslog; struct Syslog { ulong magic; char *start;
1990/1018		int wrapped;
1990/0928		char *next; char buf[2*BY2PG - 3*BY2WD];
1990/1018		char buf[2*1024];
1990/0928		};
1990/0928/sys/src/9/port/devcons.c:67,73 – 1990/1018/sys/src/9/port/devcons.c:67,72
1990/0227		unlock(&lineq); duartinit();
1990/0928		sysloginit(); /* must be at the end of printinit */
1990/0227		} /*
1990/0928/sys/src/9/port/devcons.c:177,183 – 1990/1018/sys/src/9/port/devcons.c:176,181
1990/0227		{ char buf[PRINTSIZE]; int n;
1990/0928		Syslog *s;
1990/0227		strcpy(buf, "panic: ");
1990/06111		n = doprint(buf+7, buf+sizeof(buf), fmt, (&fmt+1)) - buf;
1990/0928/sys/src/9/port/devcons.c:184,191 – 1990/1018/sys/src/9/port/devcons.c:182,187
1990/0227		buf[n] = '\n'; putstrn(buf, n+1);
1990/0907		dumpstack();
1990/0928		s = SYSLOG; print("start/next is %lux/%lux\n", s->start, s->next);
1990/0227		exit(); }
1990/0928/sys/src/9/port/devcons.c:309,314 – 1990/1018/sys/src/9/port/devcons.c:305,311
1990/0227		Qcputime,
1990/0720		Qlog,
1990/0227		Qnull,
1990/1018		/* Qpanic, /**/
1990/0227		Qpgrpid, Qpid, Qppid,
1990/0928/sys/src/9/port/devcons.c:321,326 – 1990/1018/sys/src/9/port/devcons.c:318,324
1990/0227		"cputime", Qcputime, 72, 0600,
1990/0912		"log", Qlog, BY2PG-8, 0600,
1990/0227		"null", Qnull, 0, 0600,
1990/1018		/* "panic", Qpanic, 0, 0666, /**/
1990/0227		"pgrpid", Qpgrpid, 12, 0600, "pid", Qpid, 12, 0600, "ppid", Qppid, 12, 0600,
1990/0928/sys/src/9/port/devcons.c:618,695 – 1990/1018/sys/src/9/port/devcons.c:616,726
1990/0720		sysloginit(void) { Syslog *s;
1990/0928		char *start, *next;
1990/1018		int i;
1990/0720		s = SYSLOG;
1990/0928		next = s->next; start = s->start; if(s->magic!=SYSLOGMAGIC || next>=&s->buf[sizeof(s->buf)] || start>=&s->buf[sizeof(s->buf)] || next<s->buf){
1990/0912		s->start = s->buf;
1990/1018		if(s->magic!=SYSLOGMAGIC || s->next>=&s->buf[sizeof(s->buf)] || s->next<s->buf){ s->wrapped = 0;
1990/0720		s->next = s->buf; s->magic = SYSLOGMAGIC; }
1990/0928		print("start/next is %lux/%lux was %lux/%lux\n", s->start, s->next, start, next);
1990/0720		} void syslog(char *p, int n) {
1990/0912		int restart;
1990/0720		Syslog *s; char *end;
1990/1018		int m;
1990/0720
1990/1018		sysloginit();
1990/0720		s = SYSLOG; end = &s->buf[sizeof(s->buf)];
1990/0912		restart = 0;
1990/0720		while(n-- > 0){ *s->next++ = *p++; if(s->next >= end)
1990/1018		while(n){ if(s->next + n > end) m = end - s->next; else m = n; memcpy(s->next, p, m); s->next += m; p += m; n -= m; if(s->next >= end){ s->wrapped = 1;
1990/0720		s->next = s->buf;
1990/0912		if(s->next == s->start) restart = 1;
1990/1018		}
1990/0720		}
1990/0912		if(restart){ s->start = s->next + 1; if(s->start >= end) s->start = s->buf; } wbflush();
1990/0720		} long readlog(ulong off, char *buf, ulong n)
1990/1018		readlog(ulong off, char *buf, ulong len)
1990/0720		{ Syslog *s; char *p; char *end;
1990/0912		char *a = buf;
1990/1018		char *start; int n, m; char *p;
1990/0720
1990/1018		n = len; p = buf; sysloginit();
1990/0720		s = SYSLOG;
1990/1018		end = &s->buf[sizeof(s->buf)];
1990/0720		/* past end */ if(off >= sizeof(s->buf))
1990/1018		if(s->wrapped){ start = s->next; m = sizeof(s->buf); } else { start = s->buf; m = s->next - start; } if(off > m)
1990/0720		return 0;
1990/1018		if(off + n > m) n = m - off; start += off; if(start > end) start -= sizeof(s->buf);
1990/0720		/* point to start of area to be read */
1990/1018		while(n > 0){ if(start + n > end) m = end - start; else m = n; memcpy(p, start, m); start += m; p += m; n -= m; if(start >= end) start = s->buf; } return p-buf; } /* * Read and write every byte of the log. This seems to ensure that * on reboot, the bytes will really be in memory. I don't understand -- presotto */ void flushsyslog(void) { Syslog *s; char *p, *end; int x; s = SYSLOG;
1990/0720		end = &s->buf[sizeof(s->buf)];
1990/0912		p = s->start;
1990/0720
1990/0912		/* skip offset */ while(off-- > 0){ if(p == s->next) return 0; p++; }
1990/1018		x = splhi(); lock(&printq); for(p = s->buf; p < end; p++) *p = *p; unlock(&printq); splx(x);
1990/0912		/* copy out */ while(n-- > 0){ if(p == s->next) break; *a++ = *p++;
1990/0720		if(p >= end) p = s->buf; }
1990/0912		return a-buf;
1990/1018		wbflush();
1990/0227		}