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WebSVN – planix.SVN – Blame – /os/branches/planix-v0/sys/src/libdraw/keyboard.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 <thread.h>
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#include <keyboard.h>
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void
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closekeyboard(Keyboardctl *kc)
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{
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	if(kc == nil)
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		return;
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	postnote(PNPROC, kc->pid, "kill");
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#ifdef BUG
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	/* Drain the channel */
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	while(?kc->c)
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		<-kc->c;
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#endif
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	close(kc->ctlfd);
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	close(kc->consfd);
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	free(kc->file);
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	free(kc->c);
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	free(kc);
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}
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static
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void
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_ioproc(void *arg)
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{
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	int m, n;
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	char buf[20];
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	Rune r;
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	Keyboardctl *kc;
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	kc = arg;
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	threadsetname("kbdproc");
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	kc->pid = getpid();
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	n = 0;
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	for(;;){
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		while(n>0 && fullrune(buf, n)){
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			m = chartorune(&r, buf);
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			n -= m;
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			memmove(buf, buf+m, n);
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			send(kc->c, &r);
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		}
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		m = read(kc->consfd, buf+n, sizeof buf-n);
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		if(m <= 0){
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			yield();	/* if error is due to exiting, we'll exit here */
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			fprint(2, "keyboard read error: %r\n");
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			threadexits("error");
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		}
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		n += m;
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	}
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}
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Keyboardctl*
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initkeyboard(char *file)
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{
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	Keyboardctl *kc;
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	char *t;
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	kc = mallocz(sizeof(Keyboardctl), 1);
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	if(kc == nil)
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		return nil;
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	if(file == nil)
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		file = "/dev/cons";
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	kc->file = strdup(file);
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	kc->consfd = open(file, ORDWR|OCEXEC);
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	t = malloc(strlen(file)+16);
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	if(kc->consfd<0 || t==nil){
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Error1:
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		free(kc);
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		return nil;
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	}
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	sprint(t, "%sctl", file);
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	kc->ctlfd = open(t, OWRITE|OCEXEC);
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	if(kc->ctlfd < 0){
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		fprint(2, "initkeyboard: can't open %s: %r\n", t);
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Error2:
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		close(kc->consfd);
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		free(t);
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		goto Error1;
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	}
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	if(ctlkeyboard(kc, "rawon") < 0){
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		fprint(2, "initkeyboard: can't turn on raw mode on %s: %r\n", t);
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		close(kc->ctlfd);
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		goto Error2;
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	}
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	free(t);
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	kc->c = chancreate(sizeof(Rune), 20);
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	proccreate(_ioproc, kc, 4096);
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	return kc;
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}
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int
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ctlkeyboard(Keyboardctl *kc, char *m)
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{
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	return write(kc->ctlfd, m, strlen(m));
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}