1990/0912/port/devcons.c (diff list | history)

1990/0907/sys/src/9/port/devcons.c:303,309 – 1990/0912/sys/src/9/port/devcons.c:303,309 (short | long | prev | next)
1990/0227		Dirtab consdir[]={ "cons", Qcons, 0, 0600, "cputime", Qcputime, 72, 0600,
1990/0720		"log", Qlog, sizeof(SYSLOG->buf), 0600,
1990/0912		"log", Qlog, BY2PG-8, 0600,
1990/0227		"null", Qnull, 0, 0600, "pgrpid", Qpgrpid, 12, 0600, "pid", Qpid, 12, 0600,
1990/0907/sys/src/9/port/devcons.c:596,603 – 1990/0912/sys/src/9/port/devcons.c:596,614
1990/0720		} /* * crash info
1990/0912		* kernel based system log, passed between crashes
1990/0720		*/
1990/0912		#define SYSLOGMAGIC 0x23456789 #define SYSLOG ((Syslog *)(UNCACHED | KZERO | 0x1B00)) typedef struct Syslog Syslog; struct Syslog { ulong magic; char *start; char *next; char buf[BY2PG - 3*BY2WD]; };
1990/0720		void sysloginit(void) {
1990/0907/sys/src/9/port/devcons.c:606,612 – 1990/0912/sys/src/9/port/devcons.c:617,624
1990/0720		s = SYSLOG; if(s->magic!=SYSLOGMAGIC || s->next>=&s->buf[sizeof(s->buf)] || s->next<s->buf){
1990/0912		|| s->start>=&s->buf[sizeof(s->buf)] || s->next<s->buf){ s->start = s->buf;
1990/0720		s->next = s->buf; s->magic = SYSLOGMAGIC; }
1990/0907/sys/src/9/port/devcons.c:615,631 – 1990/0912/sys/src/9/port/devcons.c:627,652
1990/0720		void syslog(char *p, int n) { int i;
1990/0912		int restart;
1990/0720		Syslog *s; char *end; s = SYSLOG; end = &s->buf[sizeof(s->buf)];
1990/0912		restart = 0;
1990/0720		while(n-- > 0){ *s->next++ = *p++; if(s->next >= end) s->next = s->buf;
1990/0912		if(s->next == s->start) restart = 1;
1990/0720		}
1990/0912		if(restart){ s->start = s->next + 1; if(s->start >= end) s->start = s->buf; } wbflush();
1990/0720		} long
1990/0907/sys/src/9/port/devcons.c:632,640 – 1990/0912/sys/src/9/port/devcons.c:653,661
1990/0720		readlog(ulong off, char *buf, ulong n) { Syslog *s; int i; char *p; char *end;
1990/0912		char *a = buf;
1990/0720		s = SYSLOG;
1990/0907/sys/src/9/port/devcons.c:642,661 – 1990/0912/sys/src/9/port/devcons.c:663,686
1990/0720		if(off >= sizeof(s->buf)) return 0; /* trim length */ if(off + n >= sizeof(s->buf)) n = sizeof(s->buf) - off;                  /* point to start of area to be read */ end = &s->buf[sizeof(s->buf)]; p = s->next + off; if(p > end) p -= sizeof(s->buf);
1990/0912		p = s->start;
1990/0720		for(i = 0; i < n; i++){ *buf++ = *p++;
1990/0912		/* skip offset */ while(off-- > 0){ if(p == s->next) return 0; p++; } /* copy out */ while(n-- > 0){ if(p == s->next) break; *a++ = *p++;
1990/0720		if(p >= end) p = s->buf; } return n;
1990/0912		return a-buf;
1990/0227		}