1992/0111/port/devroot.c (diff list | history)

port/devroot.c on 1990/0227
1990/0227		#include "u.h" #include "lib.h" #include "mem.h" #include "dat.h" #include "fns.h"
1992/0111		#include "../port/error.h"
1990/0227		#include "devtab.h" enum{ Qdir, Qbin, Qdev, Qenv, Qproc,
1991/1206		Qboot, Qcfs, Qkfs,
1990/0227		};
1991/0214		extern long cfslen;
1991/0216		extern ulong cfscode[];
1991/0910		extern long kfslen; extern ulong kfscode[];
1991/1206		extern ulong bootlen; extern ulong bootcode[];
1991/0214
1990/0227		Dirtab rootdir[]={
1991/1112		"bin", {Qbin|CHDIR}, 0, 0777, "boot", {Qboot}, 0, 0777, "dev", {Qdev|CHDIR}, 0, 0777, "env", {Qenv|CHDIR}, 0, 0777, "proc", {Qproc|CHDIR}, 0, 0777,
1990/0227		}; #define NROOT (sizeof rootdir/sizeof(Dirtab))
1991/0615		Dirtab rootpdir[]={
1991/1112		"cfs", {Qcfs}, 0, 0777, "kfs", {Qkfs}, 0, 0777,
1991/0615		}; Dirtab *rootmap[sizeof rootpdir/sizeof(Dirtab)];
1991/0214		int nroot;
1990/0227
1991/0615		int rootgen(Chan *c, Dirtab *tab, int ntab, int i, Dir *dp) { if(tab==0 || i>=ntab) return -1; if(i < NROOT) tab += i; else tab = rootmap[i - NROOT];
1991/1109		devdir(c, tab->qid, tab->name, tab->length, eve, tab->perm, dp);
1991/0615		return 1; }
1990/0227		void rootreset(void) {
1991/0615		int i; i = 0; if(cfslen) rootmap[i++] = &rootpdir[0];
1991/0910		if(kfslen)
1991/0913		rootmap[i++] = &rootpdir[1];
1991/0615		nroot = NROOT + i;
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) {
1991/1206		if(strcmp(name, "..") == 0) { c->qid.path = Qdir|CHDIR; return 1; }
1991/0615		return devwalk(c, name, rootdir, nroot, rootgen);
1990/0227		} void rootstat(Chan *c, char *dp) {
1991/0615		devstat(c, dp, rootdir, nroot, rootgen);
1990/0227		} Chan* rootopen(Chan *c, int omode) {
1991/0615		return devopen(c, omode, rootdir, nroot, rootgen);
1990/0227		} void rootcreate(Chan *c, char *name, int omode, ulong perm) {
1991/1115		USED(c, name, omode, perm);
1990/11211		error(Eperm);
1990/0227		} /* * sysremove() knows this is a nop */ void rootclose(Chan *c) {
1991/1115		USED(c);
1990/0227		} 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:
1991/0615		return devdirread(c, buf, n, rootdir, nroot, rootgen);
1990/0227		case Qboot: /* boot */
1991/1206		if(offset >= bootlen)
1990/0227		return 0;
1991/1206		if(offset+n > bootlen) n = bootlen - offset;
1991/0411		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);
1991/0910		return n; case Qkfs: /* kfs */ if(offset >= kfslen) return 0; if(offset+n > kfslen) n = kfslen - offset; memmove(buf, ((char*)kfscode)+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		{
1991/1115		USED(c, buf, n, offset);
1990/11211		error(Egreg);
1990/0227		} void rootremove(Chan *c) {
1991/1115		USED(c);
1990/11211		error(Eperm);
1990/0227		} void rootwstat(Chan *c, char *dp) {
1991/1115		USED(c, dp);
1990/11211		error(Eperm);
1990/0227		}