sys/src/cmd/dial/pass.c

   1 #include <u.h>
   2 #include <libc.h>
   3
   4 int alarmed;
   5 int done;
   6
   7 void
   8 usage(void)
   9 {
  10         fprint(2, "usage: %s [-q]\n", argv0);
  11         exits("usage");
  12 }
  13
  14 void
  15 ding(void*, char *s)
  16 {
  17         if(strstr(s, "alarm")){
  18                 alarmed = 1;
  19                 noted(NCONT);
  20         } else
  21                 noted(NDFLT);
  22 }
  23
  24
  25 void
  26 main(int argc, char **argv)
  27 {
  28         int fd, cfd;
  29         int i;
  30         char buf[1];
  31         int quiet = 0;
  32
  33         ARGBEGIN {
  34         case 'q':
  35                 quiet = 1;
  36                 break;
  37         } ARGEND;
  38
  39         notify(ding);
  40
  41         fd = open("/dev/cons", ORDWR);
  42         if(fd < 0)
  43                 sysfatal("opening /dev/cons: %r");
  44         cfd = open("/dev/consctl", OWRITE);
  45         if(cfd >= 0)
  46                 fprint(cfd, "rawon");
  47
  48         switch(rfork(RFPROC|RFFDG|RFMEM)){
  49         case -1:
  50                 sysfatal("forking: %r");
  51         default:
  52                 // read until we're done writing or
  53                 // we get an end of line
  54                 while(!done){
  55                         alarmed = 0;
  56                         alarm(250);
  57                         i = read(0, buf, 1);
  58                         alarm(0);
  59
  60                         if(i == 0)
  61                                 break;
  62                         if(i < 0){
  63                                 if(alarmed)
  64                                         continue;
  65                                 else
  66                                         break;
  67                         }
  68                         if(!quiet && write(fd, buf, 1) < 1)
  69                                 break;
  70                         if(buf[0] == '\n' || buf[0] == '\r')
  71                                 break;
  72                 }
  73                 break;
  74         case 0:
  75                 // pass one character at a time till end of line
  76                 for(;;){
  77                         if(read(fd, buf, 1) <= 0)
  78                                 break;
  79                         if(write(1, buf, 1) < 0)
  80                                 break;
  81                         if(buf[0] == '\n' || buf[0] == '\r')
  82                                 break;
  83                 }
  84
  85                 // tell reader to give up after next char
  86                 done = 1;
  87                 break;
  88         }
  89         exits(0);
  90 }