ref: 985b2457cda207c2c65edeb647aedbb6e92dac46
dir: /sys/src/cmd/srvold9p/srvold9p.c/
#include <u.h>
#include <libc.h>
#include <auth.h>
#include <fcall.h>
#include <libsec.h>
#include "9p1.h"
char *user;
int newfd;
int roldfd;
int woldfd;
int debug;
int dofcall;
QLock servelock;
QLock fidlock;
QLock taglock;
int mainpid;
int ntag;
int nfork;
char FLUSHED[] = "FLUSHED";
enum{
Maxfdata = 8192
};
enum{
Command,
Network,
File,
Stdio,
};
typedef struct Tag Tag;
struct Tag
{
int tag;
int flushed;
int received;
int ref;
Tag *next;
};
typedef struct Message Message;
struct Message
{
char *data;
int n;
};
typedef struct Fid Fid;
struct Fid
{
short busy;
short allocated;
int fid;
Qid qid;
ulong newoffset;
ulong oldoffset;
Fid *next;
};
Fid *fids;
Tag *tags;
char *rflush(Fcall*, Fcall*, char*),
*rversion(Fcall*, Fcall*, char*),
*rauth(Fcall*, Fcall*, char*),
*rattach(Fcall*, Fcall*, char*),
*rwalk(Fcall*, Fcall*, char*),
*ropen(Fcall*, Fcall*, char*),
*rcreate(Fcall*, Fcall*, char*),
*rread(Fcall*, Fcall*, char*),
*rwrite(Fcall*, Fcall*, char*),
*rclunk(Fcall*, Fcall*, char*),
*rremove(Fcall*, Fcall*, char*),
*rstat(Fcall*, Fcall*, char*),
*rwstat(Fcall*, Fcall*, char*);
char *(*fcalls[])(Fcall*, Fcall*, char*) = {
[Tversion] rversion,
[Tflush] rflush,
[Tauth] rauth,
[Tattach] rattach,
[Twalk] rwalk,
[Topen] ropen,
[Tcreate] rcreate,
[Tread] rread,
[Twrite] rwrite,
[Tclunk] rclunk,
[Tremove] rremove,
[Tstat] rstat,
[Twstat] rwstat,
};
char Etoolong[] = "name too long";
void connect(int, char*);
void post(int, char*);
void serve(void);
void demux(void);
void* emalloc(ulong);
char* transact9p1(Fcall9p1*, Fcall9p1*, char*);
Fid* newfid(int);
struct
{
char chal[CHALLEN]; /* my challenge */
char rchal[CHALLEN]; /* his challenge */
char authid[NAMEREC];
char authdom[DOMLEN];
int id;
} ai;
void
usage(void)
{
fprint(2, "usage: srvold9p [-abcCd] [-u user] [-s | [-m mountpoint]] [-x 'command' | -n network-addr | -f file] [-F] [-p servicename]\n");
exits("usage");
}
void
main(int argc, char *argv[])
{
int method;
char *oldstring;
char *mountpoint, *postname;
int mountflag, mountfd;
int p[2];
int i;
fmtinstall('F', fcallfmt);
fmtinstall('G', fcallfmt9p1);
fmtinstall('D', dirfmt);
user = getuser();
mountpoint = nil;
mountflag = 0;
postname = nil;
oldstring = nil;
method = -1;
mountfd = -1;
ARGBEGIN{
case 'a':
mountflag |= MAFTER;
break;
case 'b':
mountflag |= MBEFORE;
break;
case 'c':
mountflag |= MCREATE;
break;
case 'C':
mountflag |= MCACHE;
break;
case 'd':
debug++;
break;
case 'f':
method = File;
oldstring = ARGF();
break;
case 'F':
dofcall++;
break;
case 'm':
mountpoint = EARGF(usage());
break;
case 'n':
method = Network;
oldstring = ARGF();
break;
case 'p':
postname = ARGF();
if(postname == nil)
usage();
break;
case 's':
method = Stdio;
break;
case 'u':
user = EARGF(usage());
break;
case 'x':
method = Command;
oldstring = ARGF();
break;
default:
usage();
}ARGEND;
if(method == Stdio){
if(mountpoint!=nil || argc!=0)
usage();
}else{
if(oldstring == nil || argc != 0 || (mountflag!=0 && mountpoint==nil))
usage();
}
rfork(RFNOTEG|RFREND);
connect(method, oldstring);
if(method == Stdio)
newfd = 0;
else{
if(pipe(p) < 0)
fatal("pipe: %r");
if(postname != nil)
post(p[0], postname);
mountfd = p[0];
newfd = p[1];
}
if(debug)
fprint(2, "connected and posted\n");
switch(rfork(RFPROC|RFMEM|RFNAMEG|RFFDG)){
case 0:
mainpid = getpid();
/* child does all the work */
if(mountfd >= 0)
close(mountfd);
switch(rfork(RFPROC|RFMEM|RFFDG)){
case 0:
for(i = 0; i < 20; i++)
if (i != roldfd) close(i);
demux();
return;
case -1:
fatal("fork error: %r");
break;
}
for(i = 0; i < 20; i++)
if (i != newfd && i != woldfd && (debug == 0 || i != 2)) close(i);
serve();
break;
case -1:
fatal("fork error: %r");
break;
default:
/* parent mounts if required, then exits */
if(mountpoint){
if(mount(mountfd, -1, mountpoint, mountflag, "") < 0)
fatal("can't mount: %r");
}
break;
}
exits(nil);
}
void
connect(int method, char *oldstring)
{
char *s;
char dir[256];
switch(method){
default:
roldfd = -1;
woldfd = -1;
fatal("can't handle method type %d", method);
break;
case Network:
s = netmkaddr(oldstring, 0, "9fs");
roldfd = dial(s, 0, dir, 0);
if(roldfd < 0)
fatal("dial %s: %r", s);
woldfd = roldfd;
if(dofcall)
roldfd = fcall(woldfd);
break;
case File:
roldfd = open(oldstring, ORDWR);
if(roldfd < 0)
fatal("can't open %s: %r", oldstring);
woldfd = roldfd;
if(dofcall)
roldfd = fcall(woldfd);
break;
case Stdio:
roldfd = fcall(1);
woldfd = 1;
break;
}
}
void
post(int fd, char *srv)
{
int f;
char buf[128];
snprint(buf, sizeof buf, "/srv/%s", srv);
f = create(buf, OWRITE, 0666);
if(f < 0)
fatal("can't create %s: %r", buf);
sprint(buf, "%d", fd);
if(write(f, buf, strlen(buf)) != strlen(buf))
fatal("post write: %r");
close(f);
}
Fid *
newfid(int fid)
{
Fid *f, *ff;
ff = 0;
qlock(&fidlock);
for(f = fids; f; f = f->next)
if(f->fid == fid){
f->allocated = 1;
qunlock(&fidlock);
return f;
}
else if(!ff && !f->allocated)
ff = f;
if(ff){
ff->fid = fid;
ff->allocated = 1;
qunlock(&fidlock);
return ff;
}
f = emalloc(sizeof *f);
f->fid = fid;
f->next = fids;
f->allocated = 1;
fids = f;
qunlock(&fidlock);
return f;
}
/*
* Reads returning 9P1 messages and demultiplexes them.
* BUG: assumes one read per message.
*/
void
demux(void)
{
int m, n;
char *data;
Fcall9p1 r;
Message *msg;
Tag *t;
for(;;){
data = malloc(IOHDRSZ+Maxfdata); /* no need to clear memory */
if(data == nil)
fatal("demux malloc: %r");
m = read(roldfd, data, IOHDRSZ+Maxfdata);
if(m <= 0)
fatal("read error talking to old system: %r");
n = convM2S9p1(data, &r, m);
if(n == 0)
fatal("bad conversion receiving from old system");
if(debug)
fprint(2, "srvold9p:<=%G\n", &r);
qlock(&taglock);
for(t=tags; t!=nil; t=t->next)
if(t->tag == r.tag){
t->received = 1;
break;
}
qunlock(&taglock);
/*
* Fcall9p1 tag is used to rendezvous.
* Recipient converts message a second time, but that's OK.
*/
msg = emalloc(sizeof(Message));
msg->data = data;
msg->n = n;
rendezvous((void*)r.tag, msg);
}
}
Tag*
newtag(int tag)
{
Tag *t;
t = emalloc(sizeof(Tag));
t->tag = tag;
t->flushed = 0;
t->received = 0;
t->ref = 1;
qlock(&taglock);
t->next = tags;
tags = t;
qunlock(&taglock);
return t;
}
void
freetag(Tag *tag) /* called with taglock set */
{
Tag *t, *prev;
if(tag->ref-- == 1){
prev = nil;
for(t=tags; t!=nil; t=t->next){
if(t == tag){
if(prev == nil)
tags = t->next;
else
prev->next = t->next;
break;
}
prev = t;
}
if(t == nil)
sysfatal("freetag");
free(tag);
}
}
void
serve(void)
{
char *err;
int n;
Fcall thdr;
Fcall rhdr;
uchar mdata[IOHDRSZ+Maxfdata];
char mdata9p1[IOHDRSZ+Maxfdata];
Tag *tag;
for(;;){
qlock(&servelock);
for(;;){
n = read9pmsg(newfd, mdata, sizeof mdata);
if(n == 0)
continue;
if(n < 0)
break;
if(n > 0 && convM2S(mdata, n, &thdr) > 0)
break;
}
if(n>0 && servelock.head==nil) /* no other processes waiting to read */
switch(rfork(RFPROC|RFMEM)){
case 0:
/* child starts serving */
continue;
break;
case -1:
fatal("fork error: %r");
break;
default:
break;
}
qunlock(&servelock);
if(n < 0)
fatal(nil); /* exit quietly; remote end has just hung up */
if(debug)
fprint(2, "srvold9p:<-%F\n", &thdr);
tag = newtag(thdr.tag);
if(!fcalls[thdr.type])
err = "bad fcall type";
else
err = (*fcalls[thdr.type])(&thdr, &rhdr, mdata9p1);
qlock(&taglock);
if(tag->flushed){
freetag(tag);
qunlock(&taglock);
continue;
}
qunlock(&taglock);
if(err){
rhdr.type = Rerror;
rhdr.ename = err;
}else{
rhdr.type = thdr.type + 1;
rhdr.fid = thdr.fid;
}
rhdr.tag = thdr.tag;
if(debug)
fprint(2, "srvold9p:->%F\n", &rhdr);/**/
n = convS2M(&rhdr, mdata, sizeof mdata);
if(n == 0)
fatal("convS2M error on write");
if(write(newfd, mdata, n) != n)
fatal("mount write");
qlock(&taglock);
freetag(tag);
qunlock(&taglock);
}
}
void
send9p1(Fcall9p1 *t, char *data)
{
int m, n;
if(debug)
fprint(2, "srvold9p:=>%G\n", t);
n = convS2M9p1(t, data);
if(n == 0)
fatal("bad conversion sending to old system");
m = write(woldfd, data, n);
if(m != n)
fatal("wrote %d to old system; should be %d", m, n);
}
int
recv9p1(Fcall9p1 *r, int tag, char *data)
{
int n;
Message *msg;
msg = rendezvous((void*)tag, 0);
if(msg == (void*)~0)
fatal("rendezvous: %r");
if(msg == nil){
if(debug)
fprint(2, "recv flushed\n");
return -1;
}
/* copy data to local buffer */
memmove(data, msg->data, msg->n);
n = convM2S9p1(data, r, msg->n);
if(n == 0)
fatal("bad conversion receiving from old system");
free(msg->data);
free(msg);
return 1;
}
char*
transact9p1(Fcall9p1 *t, Fcall9p1 *r, char *mdata9p1)
{
send9p1(t, mdata9p1);
if(recv9p1(r, t->tag, mdata9p1) < 0)
return FLUSHED;
if(r->type == Rerror9p1)
return r->ename;
if(r->type != t->type+1)
fatal("bad message type; expected %d got %d", t->type+1, r->type);
return nil;
}
char*
rflush(Fcall *t, Fcall *, char *mdata9p1)
{
Fcall9p1 t9, r9;
Tag *oldt;
t9.type = Tflush9p1;
t9.tag = t->tag;
t9.oldtag = t->oldtag;
qlock(&taglock);
for(oldt=tags; oldt!=nil; oldt=oldt->next)
if(oldt->tag == t->oldtag){
oldt->flushed = 1;
oldt->ref++;
break;
}
qunlock(&taglock);
if(oldt == nil){ /* nothing to flush */
if(debug)
fprint(2, "no such tag to flush\n");
return 0;
}
transact9p1(&t9, &r9, mdata9p1); /* can't error */
qlock(&taglock);
if(oldt->received == 0){ /* wake up receiver */
if(debug)
fprint(2, "wake up receiver\n");
oldt->received = 1;
rendezvous((void*)t->oldtag, 0);
}
freetag(oldt);
qunlock(&taglock);
return 0;
}
char*
rversion(Fcall *t, Fcall *r, char*)
{
Fid *f;
/* just ack; this one doesn't go to old service */
if(t->msize > IOHDRSZ+Maxfdata)
r->msize = IOHDRSZ+Maxfdata;
else
r->msize = t->msize;
if(strncmp(t->version, "9P2000", 6) != 0)
return "unknown 9P version";
r->version = "9P2000";
qlock(&fidlock);
for(f = fids; f; f = f->next){
f->busy = 0;
f->allocated = 0;
}
qunlock(&fidlock);
return 0;
}
char*
rauth(Fcall *, Fcall *, char *)
{
return "srvold9p: authentication not supported";
}
#ifdef asdf
void
memrandom(void *p, int n)
{
ulong *lp;
uchar *cp;
for(lp = p; n >= sizeof(ulong); n -= sizeof(ulong))
*lp++ = fastrand();
for(cp = (uchar*)lp; n > 0; n--)
*cp++ = fastrand();
}
char*
rsession(Fcall *t, Fcall *r, char *mdata9p1)
{
char *err;
Fcall9p1 t9, r9;
Fid *f;
t9.type = Tsession9p1;
t9.tag = t->tag;
if(doauth)
memrandom(t9.chal, sizeof t9.chal);
else
memset(t9.chal, 0, sizeof t9.chal);
err = transact9p1(&t9, &r9, mdata9p1);
if(err)
return err;
qlock(&fidlock);
for(f = fids; f; f = f->next){
f->busy = 0;
f->allocated = 0;
}
qunlock(&fidlock);
if(doauth){
memmove(ai.authid, r9.authid, sizeof ai.authid);
memmove(ai.authdom, r9.authdom, sizeof ai.authid);
memmove(ai.rchal, r9.chal, sizeof ai.rchal);
memmove(ai.chal, t9.chal, sizeof ai.chal);
r->authid = ai.authid;
r->authdom = ai.authdom;
r->chal = (uchar*)ai.rchal;
r->nchal = CHALLEN;
} else {
r->authid = "";
r->authdom = "";
r->nchal = 0;
r->chal = nil;
}
return 0;
}
#endif
char*
rattach(Fcall *t, Fcall *r, char *mdata9p1)
{
char *err;
Fcall9p1 t9, r9;
Fid *f;
f = newfid(t->fid);
if(f->busy)
return "attach: fid in use";
/* no authentication! */
t9.type = Tattach9p1;
t9.tag = t->tag;
t9.fid = t->fid;
strncpy(t9.uname, t->uname, NAMEREC);
if(strcmp(user, "none") == 0)
strncpy(t9.uname, user, NAMEREC);
strncpy(t9.aname, t->aname, NAMEREC);
memset(t9.ticket, 0, sizeof t9.ticket);
memset(t9.auth, 0, sizeof t9.auth);
err = transact9p1(&t9, &r9, mdata9p1);
if(err)
return err;
r->qid.path = r9.qid.path & ~0x80000000;
r->qid.vers = r9.qid.version;
r->qid.type = QTDIR;
f->busy = 1;
f->qid = r->qid;
return 0;
}
char*
rwalk(Fcall *t, Fcall *r, char *mdata9p1)
{
char *err;
Fcall9p1 t9, r9;
int i, fid;
Qid *q;
Fid *f, *nf;
f = newfid(t->fid);
if(!f->busy)
return "walk: bad fid";
fid = t->fid;
nf = nil;
if(t->fid != t->newfid){
nf = newfid(t->newfid);
if(nf->busy)
return "walk: newfid in use";
t9.type = Tclone9p1;
t9.tag = t->tag;
t9.fid = t->fid;
t9.newfid = t->newfid;
err = transact9p1(&t9, &r9, mdata9p1);
if(err){
nf->busy = 0;
nf->allocated = 0;
return err;
}
fid = t->newfid;
nf->busy = 1;
}
err = nil;
r->nwqid = 0;
for(i=0; i<t->nwname && err==nil; i++){
if(i > MAXWELEM)
break;
t9.type = Twalk9p1;
t9.tag = t->tag;
t9.fid = fid;
strncpy(t9.name, t->wname[i], NAMEREC);
err = transact9p1(&t9, &r9, mdata9p1);
if(err == FLUSHED){
i = -1; /* guarantee cleanup */
break;
}
if(err == nil){
q = &r->wqid[r->nwqid++];
q->type = QTFILE;
if(r9.qid.path & 0x80000000)
q->type = QTDIR;
q->vers = r9.qid.version;
q->path = r9.qid.path & ~0x80000000;
}
}
if(nf!=nil && (err!=nil || i<t->nwname)){
/* clunk the new fid */
t9.type = Tclunk9p1;
t9.tag = t->tag;
t9.fid = t->newfid;
transact9p1(&t9, &r9, mdata9p1);
/* ignore more errors */
nf->busy = 0;
nf->allocated = 0;
}
if(i>0 && i==t->nwname && err==nil)
f->qid = r->wqid[r->nwqid-1];
if(i > 0)
return 0;
return err;
}
char*
ropen(Fcall *t, Fcall *r, char *mdata9p1)
{
char *err;
Fcall9p1 t9, r9;
Fid *f;
f = newfid(t->fid);
if(!f->busy)
return "open: bad fid";
t9.type = Topen9p1;
t9.tag = t->tag;
t9.fid = t->fid;
t9.mode = t->mode;
err = transact9p1(&t9, &r9, mdata9p1);
if(err)
return err;
r->qid.path = r9.qid.path & ~0x80000000;
r->qid.vers = r9.qid.version;
r->qid.type = QTFILE;
if(r9.qid.path & 0x80000000)
r->qid.type = QTDIR;
f->qid = r->qid;
f->newoffset = 0;
f->oldoffset = 0;
r->iounit = 0;
return 0;
}
char*
rcreate(Fcall *t, Fcall *r, char *mdata9p1)
{
char *err;
Fcall9p1 t9, r9;
Fid *f;
f = newfid(t->fid);
if(!f->busy)
return "create: bad fid";
t9.type = Tcreate9p1;
t9.tag = t->tag;
t9.fid = t->fid;
if(strlen(t->name)+1 >= NAMEREC)
return "file name element too long";
strncpy(t9.name, t->name, NAMEREC);
t9.perm = t->perm;
t9.mode = t->mode;
err = transact9p1(&t9, &r9, mdata9p1);
if(err)
return err;
r->qid.path = r9.qid.path & ~0x80000000;
r->qid.vers = r9.qid.version;
r->qid.type = QTFILE;
if(r9.qid.path & 0x80000000)
r->qid.type = QTDIR;
if(r9.qid.path & 0x40000000)
r->qid.type |= QTAPPEND;
if(r9.qid.path & 0x20000000)
r->qid.type |= QTEXCL;
f->qid = r->qid;
r->iounit = 0;
return 0;
}
char*
dirrread(Fcall *t, Fcall *r, char *mdata9p1)
{
char *err;
Fcall9p1 t9, r9;
Fid *f;
int i, ndir, n, count;
Dir d;
uchar buf[Maxfdata];
char *old;
f = newfid(t->fid);
if(!f->busy)
return "dirread: bad fid";
if(f->newoffset != t->offset)
return "seek in directory disallowed";
t9.type = Tread9p1;
t9.tag = t->tag;
t9.fid = t->fid;
t9.offset = f->oldoffset;
t9.count = t->count; /* new directories tend to be smaller, so this may overshoot */
err = transact9p1(&t9, &r9, mdata9p1);
if(err)
return err;
ndir = r9.count/DIRREC;
old = r9.data;
count = 0;
for(i=0; i<ndir; i++){
if(convM2D9p1(old, &d) != DIRREC)
return "bad dir conversion in read";
n = convD2M(&d, buf+count, sizeof buf-count);
if(n<=BIT16SZ || count+n>t->count)
break;
old += DIRREC;
f->oldoffset += DIRREC;
f->newoffset += n;
count += n;
}
memmove(r9.data, buf, count); /* put it back in stable storage */
r->data = r9.data;
r->count = count;
return 0;
}
char*
rread(Fcall *t, Fcall *r, char *mdata9p1)
{
char *err;
Fcall9p1 t9, r9;
Fid *f;
f = newfid(t->fid);
if(!f->busy)
return "read: bad fid";
if(f->qid.type & QTDIR)
return dirrread(t, r, mdata9p1);
t9.type = Tread9p1;
t9.tag = t->tag;
t9.fid = t->fid;
t9.offset = t->offset;
t9.count = t->count;
err = transact9p1(&t9, &r9, mdata9p1);
if(err)
return err;
r->count = r9.count;
r->data = r9.data; /* points to stable storage */
return 0;
}
char*
rwrite(Fcall *t, Fcall *r, char *mdata9p1)
{
char *err;
Fcall9p1 t9, r9;
Fid *f;
f = newfid(t->fid);
if(!f->busy)
return "write: bad fid";
t9.type = Twrite9p1;
t9.tag = t->tag;
t9.fid = t->fid;
t9.offset = t->offset;
t9.count = t->count;
t9.data = t->data;
err = transact9p1(&t9, &r9, mdata9p1);
if(err)
return err;
r->count = r9.count;
return 0;
}
char*
rclunk(Fcall *t, Fcall *, char *mdata9p1)
{
Fcall9p1 t9, r9;
Fid *f;
f = newfid(t->fid);
if(!f->busy)
return "clunk: bad fid";
t9.type = Tclunk9p1;
t9.tag = t->tag;
t9.fid = t->fid;
transact9p1(&t9, &r9, mdata9p1);
f->busy = 0;
f->allocated = 0;
/* disregard error */
return 0;
}
char*
rremove(Fcall *t, Fcall*, char *mdata9p1)
{
char *err;
Fcall9p1 t9, r9;
Fid *f;
f = newfid(t->fid);
if(!f->busy)
return "remove: bad fid";
t9.type = Tremove9p1;
t9.tag = t->tag;
t9.fid = t->fid;
err = transact9p1(&t9, &r9, mdata9p1);
f->busy = 0;
f->allocated = 0;
return err;
}
char*
rstat(Fcall *t, Fcall *r, char *mdata9p1)
{
Fcall9p1 t9, r9;
char *err;
Fid *f;
Dir d;
uchar buf[256]; /* big enough; there's no long names */
f = newfid(t->fid);
if(!f->busy)
return "stat: bad fid";
t9.type = Tstat9p1;
t9.tag = t->tag;
t9.fid = t->fid;
err = transact9p1(&t9, &r9, mdata9p1);
if(err)
return err;
if(convM2D9p1(r9.stat, &d) != DIRREC)
return "bad conversion in stat";
r->stat = buf;
r->nstat = convD2M(&d, buf, sizeof buf);
return 0;
}
int
anydefault(Dir *d)
{
if(d->name[0] == '\0')
return 1;
if(d->uid[0] == '\0')
return 1;
if(d->gid[0] == '\0')
return 1;
if(d->mode == ~0)
return 1;
if(d->mtime == ~0)
return 1;
return 0;
}
char*
rwstat(Fcall *t, Fcall *, char *mdata9p1)
{
Fcall9p1 t9, r9;
char strs[DIRREC];
char *err;
Fid *f;
Dir d, cd;
f = newfid(t->fid);
if(!f->busy)
return "wstat: bad fid";
convM2D(t->stat, t->nstat, &d, strs);
cd = d;
if(anydefault(&d)){
/* must first stat file so we can copy current values */
t9.type = Tstat9p1;
t9.tag = t->tag;
t9.fid = t->fid;
err = transact9p1(&t9, &r9, mdata9p1);
if(err)
return err;
if(convM2D9p1(r9.stat, &cd) != DIRREC)
return "bad in conversion in wstat";
/* fill in default values */
if(d.name[0] != '\0'){
if(strlen(d.name) >= NAMEREC)
return Etoolong;
cd.name = d.name;
}
if(d.uid[0] != '\0'){
if(strlen(d.uid) >= NAMEREC)
return Etoolong;
cd.uid = d.uid;
}
if(d.gid[0] != '\0'){
if(strlen(d.gid) >= NAMEREC)
return Etoolong;
cd.gid = d.gid;
}
if(d.mode != ~0)
cd.mode = d.mode;
if(d.mtime != ~0)
cd.mtime = d.mtime;
if(d.length != ~0LL)
cd.length = d.length;
}
if(convD2M9p1(&cd, t9.stat) != DIRREC)
return "bad out conversion in wstat";
t9.type = Twstat9p1;
t9.tag = t->tag;
t9.fid = t->fid;
err = transact9p1(&t9, &r9, mdata9p1);
if(err)
return err;
return 0;
}
void *
emalloc(ulong n)
{
void *p;
p = malloc(n);
if(!p)
fatal("out of memory: %r");
memset(p, 0, n);
return p;
}
void
fatal(char *fmt, ...)
{
char buf[1024];
va_list arg;
if(fmt){
va_start(arg, fmt);
vseprint(buf, buf+sizeof(buf), fmt, arg);
va_end(arg);
fprint(2, "%s: (pid %d) %s\n", argv0, getpid(), buf);
}else
buf[0] = '\0';
if(mainpid){
/* two hits are sometimes needed */
postnote(PNGROUP, mainpid, "die1 - from srvold9p");
postnote(PNGROUP, mainpid, "die2 - from srvold9p");
}
exits(buf);
}