1 b589fce2 2005-02-11 devnull #include <u.h>
  2 b589fce2 2005-02-11 devnull #include <libc.h>
  3 b589fce2 2005-02-11 devnull 
  4 b589fce2 2005-02-11 devnull static struct
  5 b589fce2 2005-02-11 devnull {
  6 b589fce2 2005-02-11 devnull 	int	fd;
  7 b589fce2 2005-02-11 devnull 	int	consfd;
  8 b589fce2 2005-02-11 devnull 	char	*name;
  9 b589fce2 2005-02-11 devnull 	Dir	*d;
 10 b589fce2 2005-02-11 devnull 	Dir	*consd;
 11 b589fce2 2005-02-11 devnull 	Lock	lk;
 12 b589fce2 2005-02-11 devnull } sl =
 13 b589fce2 2005-02-11 devnull {
 14 b589fce2 2005-02-11 devnull 	-1, -1,
 15 b589fce2 2005-02-11 devnull };
 16 b589fce2 2005-02-11 devnull 
 17 b589fce2 2005-02-11 devnull static void
 18 b589fce2 2005-02-11 devnull _syslogopen(void)
 19 b589fce2 2005-02-11 devnull {
 20 b589fce2 2005-02-11 devnull 	char buf[1024], *p;
 21 b589fce2 2005-02-11 devnull 
 22 b589fce2 2005-02-11 devnull 	if(sl.fd >= 0)
 23 b589fce2 2005-02-11 devnull 		close(sl.fd);
 24 b589fce2 2005-02-11 devnull 	snprint(buf, sizeof(buf), "#9/log/%s", sl.name);
 25 b589fce2 2005-02-11 devnull 	p = unsharp(buf);
 26 b589fce2 2005-02-11 devnull 	sl.fd = open(p, OWRITE|OCEXEC|OAPPEND);
 27 b589fce2 2005-02-11 devnull 	free(p);
 28 b589fce2 2005-02-11 devnull }
 29 b589fce2 2005-02-11 devnull 
 30 b589fce2 2005-02-11 devnull /*
 31 b589fce2 2005-02-11 devnull  * Print
 32 b589fce2 2005-02-11 devnull  *  sysname: time: mesg
 33 b589fce2 2005-02-11 devnull  * on /sys/log/logname.
 34 b589fce2 2005-02-11 devnull  * If cons or log file can't be opened, print on the system console, too.
 35 b589fce2 2005-02-11 devnull  */
 36 b589fce2 2005-02-11 devnull void
 37 b589fce2 2005-02-11 devnull syslog(int cons, char *logname, char *fmt, ...)
 38 b589fce2 2005-02-11 devnull {
 39 b589fce2 2005-02-11 devnull 	char buf[1024];
 40 b589fce2 2005-02-11 devnull 	char *ctim, *p;
 41 b589fce2 2005-02-11 devnull 	va_list arg;
 42 b589fce2 2005-02-11 devnull 	int n;
 43 b589fce2 2005-02-11 devnull 	Dir *d;
 44 b589fce2 2005-02-11 devnull 	char err[ERRMAX];
 45 b589fce2 2005-02-11 devnull 
 46 b589fce2 2005-02-11 devnull 	err[0] = '\0';
 47 b589fce2 2005-02-11 devnull 	errstr(err, sizeof err);
 48 b589fce2 2005-02-11 devnull 	lock(&sl.lk);
 49 b589fce2 2005-02-11 devnull 
 50 b589fce2 2005-02-11 devnull 	/*
 51 b589fce2 2005-02-11 devnull 	 *  paranoia makes us stat to make sure a fork+close
 52 b589fce2 2005-02-11 devnull 	 *  hasn't broken our fd's
 53 b589fce2 2005-02-11 devnull 	 */
 54 b589fce2 2005-02-11 devnull 	d = dirfstat(sl.fd);
 55 b589fce2 2005-02-11 devnull 	if(sl.fd < 0
 56 b589fce2 2005-02-11 devnull 	   || sl.name == nil
 57 b589fce2 2005-02-11 devnull 	   || strcmp(sl.name, logname)!=0
 58 b589fce2 2005-02-11 devnull 	   || sl.d == nil
 59 b589fce2 2005-02-11 devnull 	   || d == nil
 60 b589fce2 2005-02-11 devnull 	   || d->dev != sl.d->dev
 61 b589fce2 2005-02-11 devnull 	   || d->type != sl.d->type
 62 b589fce2 2005-02-11 devnull 	   || d->qid.path != sl.d->qid.path){
 63 b589fce2 2005-02-11 devnull 		free(sl.name);
 64 b589fce2 2005-02-11 devnull 		sl.name = strdup(logname);
 65 b589fce2 2005-02-11 devnull 		if(sl.name == nil)
 66 b589fce2 2005-02-11 devnull 			cons = 1;
 67 b589fce2 2005-02-11 devnull 		else{
 68 b589fce2 2005-02-11 devnull 			_syslogopen();
 69 b589fce2 2005-02-11 devnull 			if(sl.fd < 0)
 70 b589fce2 2005-02-11 devnull 				cons = 1;
 71 b589fce2 2005-02-11 devnull 			free(sl.d);
 72 b589fce2 2005-02-11 devnull 			sl.d = d;
 73 b589fce2 2005-02-11 devnull 			d = nil;	/* don't free it */
 74 b589fce2 2005-02-11 devnull 		}
 75 b589fce2 2005-02-11 devnull 	}
 76 b589fce2 2005-02-11 devnull 	free(d);
 77 b589fce2 2005-02-11 devnull 	if(cons){
 78 b589fce2 2005-02-11 devnull 		d = dirfstat(sl.consfd);
 79 b589fce2 2005-02-11 devnull 		if(sl.consfd < 0
 80 b589fce2 2005-02-11 devnull 		   || d == nil
 81 b589fce2 2005-02-11 devnull 		   || sl.consd == nil
 82 b589fce2 2005-02-11 devnull 		   || d->dev != sl.consd->dev
 83 b589fce2 2005-02-11 devnull 		   || d->type != sl.consd->type
 84 b589fce2 2005-02-11 devnull 		   || d->qid.path != sl.consd->qid.path){
 85 b589fce2 2005-02-11 devnull 			sl.consfd = open("/dev/tty", OWRITE|OCEXEC);
 86 b589fce2 2005-02-11 devnull 			free(sl.consd);
 87 b589fce2 2005-02-11 devnull 			sl.consd = d;
 88 b589fce2 2005-02-11 devnull 			d = nil;	/* don't free it */
 89 b589fce2 2005-02-11 devnull 		}
 90 b589fce2 2005-02-11 devnull 		free(d);
 91 b589fce2 2005-02-11 devnull 	}
 92 b589fce2 2005-02-11 devnull 
 93 b589fce2 2005-02-11 devnull 	if(fmt == nil){
 94 b589fce2 2005-02-11 devnull 		unlock(&sl.lk);
 95 b589fce2 2005-02-11 devnull 		return;
 96 b589fce2 2005-02-11 devnull 	}
 97 b589fce2 2005-02-11 devnull 
 98 b589fce2 2005-02-11 devnull 	ctim = ctime(time(0));
 99 b589fce2 2005-02-11 devnull 	werrstr(err);
100 b589fce2 2005-02-11 devnull 	p = buf + snprint(buf, sizeof(buf)-1, "%s ", sysname());
101 b589fce2 2005-02-11 devnull 	strncpy(p, ctim+4, 15);
102 b589fce2 2005-02-11 devnull 	p += 15;
103 b589fce2 2005-02-11 devnull 	*p++ = ' ';
104 b589fce2 2005-02-11 devnull 	va_start(arg, fmt);
105 b589fce2 2005-02-11 devnull 	p = vseprint(p, buf+sizeof(buf)-1, fmt, arg);
106 b589fce2 2005-02-11 devnull 	va_end(arg);
107 b589fce2 2005-02-11 devnull 	*p++ = '\n';
108 b589fce2 2005-02-11 devnull 	n = p - buf;
109 b589fce2 2005-02-11 devnull 
110 b589fce2 2005-02-11 devnull 	if(sl.fd >= 0){
111 b589fce2 2005-02-11 devnull 		seek(sl.fd, 0, 2);
112 b589fce2 2005-02-11 devnull 		write(sl.fd, buf, n);
113 b589fce2 2005-02-11 devnull 	}
114 b589fce2 2005-02-11 devnull 
115 b589fce2 2005-02-11 devnull 	if(cons && sl.consfd >=0)
116 b589fce2 2005-02-11 devnull 		write(sl.consfd, buf, n);
117 b589fce2 2005-02-11 devnull 
118 b589fce2 2005-02-11 devnull 	unlock(&sl.lk);
119 b589fce2 2005-02-11 devnull }