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- #include <u.h>
- #include <libc.h>
- /* console state (for consctl) */
- typedef struct Consstate Consstate;
- struct Consstate{
- int raw;
- int hold;
- };
- /*
- * create a shared segment. Make is start 2 meg higher than the current
- * end of process memory.
- */
- static void*
- share(int len)
- {
- ulong vastart;
- vastart = ((ulong)sbrk(0)) + 2*1024*1024;
- if(segattach(0, "shared", (void *)vastart, len) < 0)
- return 0;
- return (void*)vastart;
- }
- /*
- * bind a pipe onto consctl and keep reading it to
- * get changes to console state.
- */
- Consstate*
- consctl(void)
- {
- int i, n;
- int fd;
- int tries;
- char buf[128];
- Consstate *x;
- char *field[10];
- x = share(sizeof(Consstate));
- if(x == 0)
- return 0;
- if(bind("#|", "/mnt/term", MBEFORE) < 0
- || bind("/mnt/term/data1", "/dev/consctl", MREPL) < 0)
- return 0;
- switch(fork()){
- case -1:
- return 0;
- case 0:
- break;
- default:
- return x;
- }
- setfields(" ");
- for(tries = 0; tries < 100; tries++){
- x->raw = 0;
- x->hold = 0;
- fd = open("/mnt/term/data", OREAD);
- if(fd < 0)
- continue;
- tries = 0;
- for(;;){
- n = read(fd, buf, sizeof(buf)-1);
- if(n <= 0)
- break;
- buf[n] = 0;
- n = getmfields(buf, field, 10);
- for(i = 0; i < n; i++){
- if(strcmp(field[i], "rawon") == 0)
- x->raw = 1;
- else if(strcmp(field[i], "rawoff") == 0)
- x->raw = 0;
- else if(strcmp(field[i], "holdon") == 0)
- x->hold = 1;
- else if(strcmp(field[i], "holdoff") == 0)
- x->hold = 0;
- }
- }
- close(fd);
- }
- exits(0);
- }
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