Add real factotum.

kern/devlfd.c

@@ -0,0 +1,126 @@
+#include	"u.h"
+#include <errno.h>
+#include	"lib.h"
+#include	"dat.h"
+#include	"fns.h"
+#include	"error.h"
+
+#undef pread
+#undef pwrite
+
+Chan*
+lfdchan(int fd)
+{
+	Chan *c;
+	
+	c = newchan();
+	c->type = devno('L', 0);
+	c->aux = (void*)fd;
+	c->name = newcname("fd");
+	c->mode = ORDWR;
+	c->qid.type = 0;
+	c->qid.path = 0;
+	c->qid.vers = 0;
+	c->dev = 0;
+	c->offset = 0;
+	return c;
+}
+
+int
+lfdfd(int fd)
+{
+	return newfd(lfdchan(fd));
+}
+
+static Chan*
+lfdattach(char *x)
+{
+	USED(x);
+	
+	error(Egreg);
+	return nil;
+}
+
+static Walkqid*
+lfdwalk(Chan *c, Chan *nc, char **name, int nname)
+{
+	USED(c);
+	USED(nc);
+	USED(name);
+	USED(nname);
+	
+	error(Egreg);
+	return nil;
+}
+
+static int
+lfdstat(Chan *c, uchar *dp, int n)
+{
+	USED(c);
+	USED(dp);
+	USED(n);
+	error(Egreg);
+	return -1;
+}
+
+static Chan*
+lfdopen(Chan *c, int omode)
+{
+	USED(c);
+	USED(omode);
+	
+	error(Egreg);
+	return nil;
+}
+
+static void
+lfdclose(Chan *c)
+{
+	close((int)c->aux);
+}
+
+static long
+lfdread(Chan *c, void *buf, long n, vlong off)
+{
+	USED(off);	/* can't pread on pipes */
+	n = read((int)c->aux, buf, n);
+	if(n < 0){
+		iprint("error %d\n", errno);
+		oserror();
+	}
+	return n;
+}
+
+static long
+lfdwrite(Chan *c, void *buf, long n, vlong off)
+{
+	USED(off);	/* can't pread on pipes */
+
+	n = write((int)c->aux, buf, n);
+	if(n < 0){
+		iprint("error %d\n", errno);
+		oserror();
+	}
+	return n;
+}
+
+Dev lfddevtab = {
+	'L',
+	"lfd",
+	
+	devreset,
+	devinit,
+	devshutdown,
+	lfdattach,
+	lfdwalk,
+	lfdstat,
+	lfdopen,
+	devcreate,
+	lfdclose,
+	lfdread,
+	devbread,
+	lfdwrite,
+	devbwrite,
+	devremove,
+	devwstat,
+};