sys/src/cmd/aux/clog.c

   1 /* clog - log console */
   2 #include <u.h>
   3 #include <libc.h>
   4 #include <bio.h>
   5
   6 char *argv0;
   7
   8 int
   9 openlog(char *name)
  10 {
  11         int fd;
  12
  13         fd = open(name, OWRITE);
  14         if(fd < 0)
  15                 fd = create(name, OWRITE, DMAPPEND|0666);
  16         if(fd < 0){
  17                 fprint(2, "%s: can't open %s: %r\n", argv0, name);
  18                 return -1;
  19         }
  20         seek(fd, 0, 2);
  21         return fd;
  22 }
  23
  24 void
  25 main(int argc, char **argv)
  26 {
  27         Biobuf in;
  28         int fd;
  29         char *p, *t;
  30         char buf[Bsize];
  31
  32         argv0 = argv[0];
  33         if(argc < 3){
  34                 fprint(2, "usage: %s console logfile \n", argv0);
  35                 exits("usage");
  36         }
  37
  38         fd = open(argv[1], OREAD);
  39         if(fd < 0){
  40                 fprint(2, "%s: can't open %s: %r\n", argv0, argv[1]);
  41                 exits("open");
  42         }
  43         Binit(&in, fd, OREAD);
  44
  45         fd = openlog(argv[2]);
  46
  47         for(;;){
  48                 if(p = Brdline(&in, '\n')){
  49                         p[Blinelen(&in)-1] = 0;
  50                         t = ctime(time(0));
  51                         t[19] = 0;
  52                         while(fprint(fd, "%s: %s\n", t, p) < 0) {
  53                                 close(fd);
  54                                 sleep(500);
  55                                 fd = openlog(argv[2]);
  56                         }
  57                 } else if(Blinelen(&in) == 0)   /* true eof or error */
  58                         break;
  59                 /* discard partial buffer? perhaps due to very long line */
  60                 else if (Bread(&in, buf, sizeof buf) < 0)
  61                         break;
  62         }
  63         exits(0);
  64 }