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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- #include <u.h>
- #include <libc.h>
- #include <fcall.h>
- #include <thread.h>
- #include <9p.h>
- uint time0;
- enum
- {
- Qroot = 0,
- Qkid,
- };
- char *kidname;
- uint kidmode;
- void
- fsattach(Req *r)
- {
- char *spec;
- spec = r->ifcall.aname;
- if(spec && spec[0]){
- respond(r, "invalid attach specifier");
- return;
- }
- r->ofcall.qid = (Qid){Qroot, 0, QTDIR};
- r->fid->qid = r->ofcall.qid;
- respond(r, nil);
- }
- char*
- fswalk1(Fid *fid, char *name, Qid *qid)
- {
- switch((int)fid->qid.path){
- default:
- return "path not found";
- case Qroot:
- if(strcmp(name, "..") == 0)
- break;
- if(strcmp(name, kidname) == 0){
- fid->qid = (Qid){Qkid, 0, kidmode>>24};
- break;
- }
- return "path not found";
- case Qkid:
- if(strcmp(name, "..") == 0){
- fid->qid = (Qid){Qroot, 0, QTDIR};
- break;
- }
- return "path not found";
- }
- *qid = fid->qid;
- return nil;
- }
- void
- fsstat(Req *r)
- {
- int q;
- Dir *d;
- d = &r->d;
- memset(d, 0, sizeof *d);
- q = r->fid->qid.path;
- d->qid = r->fid->qid;
- switch(q){
- case Qroot:
- d->name = estrdup9p("/");
- d->mode = DMDIR|0777;
- break;
- case Qkid:
- d->name = estrdup9p(kidname);
- d->mode = kidmode;
- break;
- }
- d->atime = d->mtime = time0;
- d->uid = estrdup9p("stub");
- d->gid = estrdup9p("stub");
- d->muid = estrdup9p("");
- respond(r, nil);
- }
- int
- dirgen(int off, Dir *d, void *v)
- {
- if(off != 0)
- return -1;
- memset(d, 0, sizeof *d);
- d->atime = d->mtime = time0;
- d->name = estrdup9p(kidname);
- d->mode = kidmode;
- d->qid = (Qid){Qkid, 0, kidmode>>24};
- d->qid.type = d->mode>>24;
- d->uid = estrdup9p("stub");
- d->gid = estrdup9p("stub");
- d->muid = estrdup9p("");
- return 0;
- }
- void
- fsread(Req *r)
- {
- int q;
- q = r->fid->qid.path;
- switch(q){
- default:
- respond(r, "bug");
- return;
- case Qroot:
- dirread9p(r, dirgen, nil);
- respond(r, nil);
- return;
- }
- }
- void
- fswrite(Req *r)
- {
- respond(r, "no writing");
- }
- void
- fsopen(Req *r)
- {
- if(r->fid->qid.path != Qroot){
- respond(r, "permission denied");
- return;
- }
- if(r->ifcall.mode != OREAD)
- respond(r, "permission denied");
- else
- respond(r, nil);
- }
- Srv fs = {
- .attach= fsattach,
- .open= fsopen,
- .read= fsread,
- .write= fswrite,
- .stat= fsstat,
- .walk1= fswalk1,
- };
- void
- usage(void)
- {
- fprint(2, "usage: aux/stub [-Dd] path/name\n");
- exits("usage");
- }
- void
- main(int argc, char **argv)
- {
- char *p, *mtpt;
- quotefmtinstall();
- time0 = time(0);
- ARGBEGIN{
- case 'D':
- chatty9p++;
- break;
- case 'd':
- kidmode = DMDIR;
- break;
- default:
- usage();
- }ARGEND
- if(argc != 1)
- usage();
- if((p = strrchr(argv[0], '/')) == 0){
- mtpt = ".";
- kidname = argv[0];
- }else if(p == argv[0]){
- mtpt = "/";
- kidname = argv[0]+1;
- }else{
- mtpt = argv[0];
- *p++ = '\0';
- kidname = p;
- }
- /* don't leave standard descriptors open to confuse mk */
- close(0);
- close(1);
- close(2);
- postmountsrv(&fs, nil, mtpt, MBEFORE);
- exits(nil);
- }
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