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WebSVN – planix.SVN – Blame – /os/branches/feature_tlsv12/sys/src/cmd/vt/consctl.c – Rev 2

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#include <u.h>
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#include <libc.h>
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#include <draw.h>
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#include "cons.h"
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/*
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 *  bind a pipe onto consctl and keep reading it to
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 *  get changes to console state.
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 */
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Consstate*
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consctl(void)
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{
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	int i, n, fd, tries;
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	char buf[128];
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	Consstate *x;
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	char *field[10];
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	x = segattach(0, "shared", 0, sizeof *x);
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	if(x == (void*)-1)
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		sysfatal("segattach: %r");
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	/* a pipe to simulate consctl */
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	if(bind("#|", "/mnt/cons/consctl", MBEFORE) < 0
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	|| bind("/mnt/cons/consctl/data1", "/dev/consctl", MREPL) < 0)
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		sysfatal("bind consctl: %r");
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	/* a pipe to simulate the /dev/cons */
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	if(bind("#|", "/mnt/cons/cons", MREPL) < 0
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	|| bind("/mnt/cons/cons/data1", "/dev/cons", MREPL) < 0)
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		sysfatal("bind cons: %r");
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	switch(fork()){
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	case -1:
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		sysfatal("fork: %r");
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	case 0:
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		break;
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	default:
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		return x;
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	}
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	notify(0);
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	for(tries = 0; tries < 100; tries++){
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		x->raw = 0;
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		x->hold = 0;
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		fd = open("/mnt/cons/consctl/data", OREAD);
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		if(fd < 0)
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			break;
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		tries = 0;
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		for(;;){
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			n = read(fd, buf, sizeof(buf)-1);
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			if(n <= 0)
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				break;
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			buf[n] = 0;
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			n = getfields(buf, field, 10, 1, " ");
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			for(i = 0; i < n; i++){
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				if(strcmp(field[i], "rawon") == 0)
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					x->raw = 1;
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				else if(strcmp(field[i], "rawoff") == 0)
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					x->raw = 0;
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				else if(strcmp(field[i], "holdon") == 0)
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					x->hold = 1;
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				else if(strcmp(field[i], "holdoff") == 0)
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					x->hold = 0;
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			}
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		}
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		close(fd);
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	}
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	exits(0);
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	return 0;		/* dummy to keep compiler quiet*/
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}