2003/0303/port/devroot.c (diff list | history)

port/devroot.c on 1990/0227
1990/0227		#include "u.h"
1992/0321		#include "../port/lib.h"
1990/0227		#include "mem.h" #include "dat.h" #include "fns.h"
1992/0111		#include "../port/error.h"
1990/0227
2002/1130		enum { Qdir = 0, Qboot = 0x1000,
1999/0316
2002/1130		Nrootfiles = 32,
2003/0112		Nbootfiles = 32,
1990/0227		};
2002/1130		typedef struct Dirlist Dirlist; struct Dirlist { uint base; Dirtab *dir; uchar **data; int ndir; int mdir; };
1991/0214
2002/1130		static Dirtab rootdir[Nrootfiles] = { "#/", {Qdir, 0, QTDIR}, 0, DMDIR|0555, "boot", {Qboot, 0, QTDIR}, 0, DMDIR|0555,
2001/0527		};
2002/1130		static uchar *rootdata[Nrootfiles]; static Dirlist rootlist = { 0, rootdir, rootdata, 2, Nrootfiles };
1990/0227
2002/1130		static Dirtab bootdir[Nbootfiles] = { "boot", {Qboot, 0, QTDIR}, 0, DMDIR|0555, }; static uchar *bootdata[Nbootfiles]; static Dirlist bootlist = { Qboot, bootdir, bootdata, 1, Nbootfiles };
1993/0724		/*
2002/1130		* add a file to the list
1993/0724		*/
1999/0731		static void
2002/1130		addlist(Dirlist *l, char *name, uchar *contents, ulong len, int perm)
1991/0615		{
1993/0724		Dirtab *d;
1992/0711
2002/1130		if(l->ndir >= l->mdir)
1993/0724		panic("too many root files");
2002/1130		l->data[l->ndir] = contents; d = &l->dir[l->ndir];
1993/0724		strcpy(d->name, name); d->length = len;
1999/0731		d->perm = perm;
2001/0527		d->qid.type = 0; d->qid.vers = 0;
2002/1130		d->qid.path = ++l->ndir + l->base;
2001/0527		if(perm & DMDIR) d->qid.type |= QTDIR;
1991/0615		}
1999/0729		/* * add a root file */
1999/0731		void
2002/1130		addbootfile(char *name, uchar *contents, ulong len)
1999/0731		{
2002/1130		addlist(&bootlist, name, contents, len, 0555);
1999/0731		} /*
2002/1130		* add a root directory
1999/0731		*/
1997/0327		static void
1999/0729		addrootdir(char *name) {
2002/1130		addlist(&rootlist, name, nil, 0, DMDIR|0555);
1999/0729		} static void
1990/0227		rootreset(void) {
1999/0731		addrootdir("bin"); addrootdir("dev"); addrootdir("env");
2001/0527		addrootdir("fd");
2001/0819		addrootdir("mnt");
1999/0731		addrootdir("net"); addrootdir("net.alt");
2000/0223		addrootdir("proc");
1999/0731		addrootdir("root"); addrootdir("srv");
1990/0227		}
1997/0327		static Chan*
1990/0227		rootattach(char *spec) { return devattach('/', spec); }
2002/1130		static int rootgen(Chan *c, char *name, Dirtab*, int, int s, Dir *dp) { int t; Dirtab *d; Dirlist *l; switch((int)c->qid.path){ case Qdir:
2003/0303		if(s == DEVDOTDOT){ devdir(c, (Qid){Qdir, 0, QTDIR}, "#/", 0, eve, 0555, dp); return 1; }
2002/1130		return devgen(c, name, rootlist.dir, rootlist.ndir, s, dp); case Qboot: if(s == DEVDOTDOT){ devdir(c, (Qid){Qdir, 0, QTDIR}, "#/", 0, eve, 0555, dp); return 1; } return devgen(c, name, bootlist.dir, bootlist.ndir, s, dp); default:
2003/0303		if(s != 0) return -1;
2002/1130		if((int)c->qid.path < Qboot){ t = c->qid.path-1; l = &rootlist; }else{ t = c->qid.path - Qboot - 1; l = &bootlist; } if(t >= l->ndir) return -1; d = &l->dir[t]; devdir(c, d->qid, d->name, d->length, eve, d->perm, dp); return 1; } return -1; }
2001/0527		static Walkqid* rootwalk(Chan *c, Chan *nc, char **name, int nname)
1990/0227		{
2002/1130		return devwalk(c, nc, name, nname, nil, 0, rootgen);
1990/0227		}
2001/0527		static int rootstat(Chan *c, uchar *dp, int n)
1990/0227		{
2002/1130		return devstat(c, dp, n, nil, 0, rootgen);
1990/0227		}
1997/0327		static Chan*
1990/0227		rootopen(Chan *c, int omode) {
2002/1130		return devopen(c, omode, nil, 0, devgen);
1990/0227		} /* * sysremove() knows this is a nop */
1998/0512		static void
2001/0503		rootclose(Chan*)
1990/0227		{ }
1998/0512		static long
1998/0319		rootread(Chan *c, void *buf, long n, vlong off)
1990/0227		{
1993/0724		ulong t; Dirtab *d;
2002/1130		Dirlist *l;
1993/0724		uchar *data;
1998/0319		ulong offset = off;
1990/0227
2001/0527		t = c->qid.path;
1993/0724		switch(t){
1990/0227		case Qdir:
2002/1130		case Qboot: return devdirread(c, buf, n, nil, 0, rootgen);
1993/0724		}
1993/0501
2002/1130		if(t<Qboot) l = &rootlist; else{ t -= Qboot; l = &bootlist; }
2003/0303		t--; if(t >= l->ndir) error(Egreg); d = &l->dir[t]; data = l->data[t];
1993/0724		if(offset >= d->length) return 0; if(offset+n > d->length) n = d->length - offset; memmove(buf, data+offset, n); return n;
1990/0227		}
1998/0512		static long
2002/1130		rootwrite(Chan*, void*, long, vlong)
1990/0227		{
2002/1130		error(Egreg);
1993/0501		return 0;
1995/0108		}
1997/0327		Dev rootdevtab = {
1997/0408		'/', "root",
1997/0327		rootreset, devinit,
2002/0109		devshutdown,
1997/0327		rootattach, rootwalk, rootstat, rootopen,
2000/0615		devcreate,
1997/0327		rootclose, rootread, devbread, rootwrite, devbwrite, devremove, devwstat, };
2002/1130