sys/src/cmd/vt/consctl.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <draw.h>
   4 #include "cons.h"
   5
   6 /*
   7  *  bind a pipe onto consctl and keep reading it to
   8  *  get changes to console state.
   9  */
  10 Consstate*
  11 consctl(void)
  12 {
  13         int i, n, fd, tries;
  14         char buf[128];
  15         Consstate *x;
  16         char *field[10];
  17
  18         x = segattach(0, "shared", 0, sizeof *x);
  19         if(x == (void*)-1)
  20                 sysfatal("segattach: %r");
  21
  22         /* a pipe to simulate consctl */
  23         if(bind("#|", "/mnt/consctl", MBEFORE) < 0
  24         || bind("/mnt/consctl/data1", "/dev/consctl", MREPL) < 0)
  25                 sysfatal("bind consctl: %r");
  26
  27         /* a pipe to simulate the /dev/cons */
  28         if(bind("#|", "/mnt/cons", MREPL) < 0
  29         || bind("/mnt/cons/data1", "/dev/cons", MREPL) < 0)
  30                 sysfatal("bind cons: %r");
  31
  32         switch(fork()){
  33         case -1:
  34                 sysfatal("fork: %r");
  35         case 0:
  36                 break;
  37         default:
  38                 return x;
  39         }
  40
  41         notify(0);
  42
  43         for(tries = 0; tries < 100; tries++){
  44                 x->raw = 0;
  45                 x->hold = 0;
  46                 fd = open("/mnt/cons/consctl/data", OREAD);
  47                 if(fd < 0)
  48                         break;
  49                 tries = 0;
  50                 for(;;){
  51                         n = read(fd, buf, sizeof(buf)-1);
  52                         if(n <= 0)
  53                                 break;
  54                         buf[n] = 0;
  55                         n = getfields(buf, field, 10, 1, " ");
  56                         for(i = 0; i < n; i++){
  57                                 if(strcmp(field[i], "rawon") == 0)
  58                                         x->raw = 1;
  59                                 else if(strcmp(field[i], "rawoff") == 0)
  60                                         x->raw = 0;
  61                                 else if(strcmp(field[i], "holdon") == 0)
  62                                         x->hold = 1;
  63                                 else if(strcmp(field[i], "holdoff") == 0)
  64                                         x->hold = 0;
  65                         }
  66                 }
  67                 close(fd);
  68         }
  69         exits(0);
  70         return 0;               /* dummy to keep compiler quiet*/
  71 }