2000/0223/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
1993/0724		enum{ Qdir= 0,
1999/0316
1999/0731		Nfiles=32, /* max root files */
1990/0227		};
1991/1206		extern ulong bootlen;
1992/0902		extern uchar bootcode[];
1991/0214
1999/1105		Dirtab rootdir[Nfiles];
1990/0227
1993/0724		static uchar *rootdata[Nfiles];
1999/1105		static int nroot = 0;
1993/0724
1993/0501		typedef struct Recover Recover; struct Recover { int len; char *req; Recover *next; };
1998/0512		struct
1993/0501		{ Lock; QLock; Rendez; Recover *q; }reclist;
1993/0724		/* * add a root file */
1999/0731		static void addroot(char *name, uchar *contents, ulong len, int perm)
1991/0615		{
1993/0724		Dirtab *d;
1992/0711
1993/0724		if(nroot >= Nfiles) panic("too many root files"); rootdata[nroot] = contents; d = &rootdir[nroot]; strcpy(d->name, name); d->length = len;
1999/0731		d->perm = perm;
1993/0724		d->qid.path = nroot+1;
1999/0731		if(perm & CHDIR) d->qid.path |= CHDIR;
1993/0724		nroot++;
1991/0615		}
1999/0729		/* * add a root file */
1999/0731		void addrootfile(char *name, uchar *contents, ulong len) { addroot(name, contents, len, 0555); } /* * add a root file */
1997/0327		static void
1999/0729		addrootdir(char *name) {
1999/0803		addroot(name, nil, 0, CHDIR|0555);
1999/0729		} static void
1990/0227		rootreset(void) {
1999/0731		addrootdir("bin"); addrootdir("dev"); addrootdir("env"); addrootdir("net"); addrootdir("net.alt");
2000/0223		addrootdir("proc");
1999/0731		addrootdir("root"); addrootdir("srv");
1993/0724		addrootfile("boot", bootcode, bootlen); /* always have a boot file */
1990/0227		}
1997/0327		static Chan*
1990/0227		rootattach(char *spec) { return devattach('/', spec); }
1998/0512		static int
1990/0227		rootwalk(Chan *c, char *name) {
1991/1206		if(strcmp(name, "..") == 0) { c->qid.path = Qdir|CHDIR; return 1; }
1992/0225		if((c->qid.path & ~CHDIR) != Qdir)
1992/0226		return 0;
1993/0724		return devwalk(c, name, rootdir, nroot, devgen);
1990/0227		}
1998/0512		static void
1990/0227		rootstat(Chan *c, char *dp) {
1993/0724		devstat(c, dp, rootdir, nroot, devgen);
1990/0227		}
1997/0327		static Chan*
1990/0227		rootopen(Chan *c, int omode) {
1993/0501		switch(c->qid.path & ~CHDIR) { default: break; }
1993/0724		return devopen(c, omode, rootdir, nroot, devgen);
1990/0227		} /* * sysremove() knows this is a nop */
1998/0512		static void
1990/0227		rootclose(Chan *c) {
1993/1031		switch(c->qid.path) { default: break; }
1990/0227		}
1997/0327		static int
1995/0804		rdrdy(void*)
1993/0501		{ return reclist.q != 0; }
1998/0512		static long
1998/0319		rootread(Chan *c, void *buf, long n, vlong off)
1990/0227		{
1993/0724		ulong t; Dirtab *d; uchar *data;
1998/0319		ulong offset = off;
1990/0227
1993/0724		t = c->qid.path & ~CHDIR; switch(t){
1990/0227		case Qdir:
1993/0724		return devdirread(c, buf, n, rootdir, nroot, devgen); }
1993/0501
1993/0724		d = &rootdir[t-1]; data = rootdata[t-1]; 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
1999/1230		rootwrite(Chan *c, void*, long, vlong)
1990/0227		{
1993/0501		switch(c->qid.path & ~CHDIR){ default: error(Egreg); } return 0;
1995/0108		}
1999/0729		static void rootcreate(Chan *c, char *name, int mode, ulong perm) {
1999/0731		if(!iseve() || c->qid.path != (CHDIR|Qdir) || (perm & CHDIR) == 0 || mode != OREAD)
1999/0729		error(Eperm);
1999/0730		addrootdir(name);
1999/0729		c->flag |= COPEN;
1999/0731		c->mode = OREAD;
1999/0729		}
1997/0327		Dev rootdevtab = {
1997/0408		'/', "root",
1997/0327		rootreset, devinit, rootattach, devclone, rootwalk, rootstat, rootopen,
1999/0729		rootcreate,
1997/0327		rootclose, rootread, devbread, rootwrite, devbwrite, devremove, devwstat, };