1991/0411/port/devroot.c (diff list | history)

1991/0411/sys/src/9/port/devroot.c:1,139 – 1991/0419/sys/src/9/port/devroot.c:1,145 (short | long | prev | next)
1990/0227		#include "u.h" #include "lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "errno.h" #include "devtab.h" enum{ Qdir, Qbin, Qboot,
1991/0214		Qcfs,
1990/0227		Qdev, Qenv, Qproc, };
1991/0214		extern long cfslen;
1991/0216		extern ulong cfscode[];
1991/0214
1990/0227		Dirtab rootdir[]={
1990/11211		"bin", {Qbin|CHDIR}, 0, 0700, "boot", {Qboot}, 0, 0700, "dev", {Qdev|CHDIR}, 0, 0700, "env", {Qenv|CHDIR}, 0, 0700, "proc", {Qproc|CHDIR}, 0, 0700,
1991/0214		"cfs", {Qcfs}, 0, 0700,
1990/0227		}; #define NROOT (sizeof rootdir/sizeof(Dirtab))
1991/0214		int nroot;
1990/0227		void rootreset(void) {
1991/0214		nroot = (cfslen > 0) ? NROOT : NROOT-1;
1990/0227		} void rootinit(void) { } Chan* rootattach(char *spec) { return devattach('/', spec); } Chan* rootclone(Chan *c, Chan *nc) { return devclone(c, nc); } int rootwalk(Chan *c, char *name) {
1991/0214		return devwalk(c, name, rootdir, nroot, devgen);
1990/0227		}
1991/0419		Chan* rootclwalk(Chan *c, char *name) { return devclwalk(c, name); }
1990/0227		void rootstat(Chan *c, char *dp) {
1991/0214		devstat(c, dp, rootdir, nroot, devgen);
1990/0227		} Chan* rootopen(Chan *c, int omode) {
1991/0214		return devopen(c, omode, rootdir, nroot, devgen);
1990/0227		} void rootcreate(Chan *c, char *name, int omode, ulong perm) {
1990/11211		error(Eperm);
1990/0227		} /* * sysremove() knows this is a nop */ void rootclose(Chan *c) { } #include "boot.h" long
1991/0411		rootread(Chan *c, void *buf, long n, ulong offset)
1990/0227		{
1990/11211		switch(c->qid.path & ~CHDIR){
1990/0227		case Qdir:
1991/0214		return devdirread(c, buf, n, rootdir, nroot, devgen);
1990/0227		case Qboot: /* boot */
1991/0411		if(offset >= sizeof bootcode)
1990/0227		return 0;
1991/0411		if(offset+n > sizeof bootcode) n = sizeof bootcode - offset; memmove(buf, ((char*)bootcode)+offset, n);
1991/0214		return n;
1991/0312		case Qcfs: /* cfs */
1991/0411		if(offset >= cfslen)
1991/0214		return 0;
1991/0411		if(offset+n > cfslen) n = cfslen - offset; memmove(buf, ((char*)cfscode)+offset, n);
1990/0227		return n; case Qdev: return 0; }
1990/11211		error(Egreg);
1990/0227		return 0; } long
1991/0411		rootwrite(Chan *c, void *buf, long n, ulong offset)
1990/0227		{
1990/11211		error(Egreg);
1990/0227		} void rootremove(Chan *c) {
1990/11211		error(Eperm);
1990/0227		} void rootwstat(Chan *c, char *dp) {
1990/11211		error(Eperm);
1990/0227		}