C++ rerrstr函数代码示例

static void
execproc(void *a)
{
	int i, fd;
	Client *c;
	char tmp[32];

	c = a;
	snprint(tmp, sizeof tmp, "execproc%d", c->num);
	threadsetname(tmp);
	if(pipe(c->fd) < 0){
		rerrstr(c->err, sizeof c->err);
		sendul(c->execpid, -1);
		return;
	}
	rfork(RFFDG);
	fd = c->fd[1];
	close(c->fd[0]);
	dup(fd, 0);
	dup(fd, 1);
	for(i=3; i<100; i++)	/* should do better */
		close(i);
	strcpy(c->err, "exec failed");
	procexecl(c->execpid, "/bin/rc", "rc", "-c", c->cmd, nil);
}

char *
rremove(Fid *f)
{
	VacFile *vf, *vfp;
	char errbuf[80];
	char *err = nil;

	if(!f->busy)
		return vtstrdup(Enotexist);
	vf = f->file;
	vfp = vacfilegetparent(vf);

	if(!permf(vfp, f->user, Pwrite)) {
		err = Eperm;
		goto Exit;
	}

	if(!vacfileremove(vf)) {
		rerrstr(errbuf, sizeof errbuf);
		err = errbuf;
	}

Exit:
	vacfiledecref(vfp);
	rclunk(f);
	return vtstrdup(err);
}

void
writethread(void *v)
{
	WriteReq wr;
	char err[ERRMAX];

	USED(v);

	while(recv(writechan, &wr) == 1){
		nrecv++;
		if(wr.p == nil)
			break;
		
		if(fastwrites && vtread(z, wr.score, wr.type, nil, 0) < 0){
			rerrstr(err, sizeof err);
			if(strstr(err, "read too small")){	/* already exists */
				nskip++;
				packetfree(wr.p);
				continue;
			}
		}
		if(vtwritepacket(z, wr.score, wr.type, wr.p) < 0)
			sysfatal("vtwritepacket: %r");
		packetfree(wr.p);
	}
}

char*
rread(Fid *f)
{
	char *buf;
	int64_t off;
	int cnt;
	VacFile *vf;
	char err[80];
	int n;

	if(!f->busy)
		return vtstrdup(Enotexist);
	vf = f->file;
	thdr.count = 0;
	off = rhdr.offset;
	buf = thdr.data;
	cnt = rhdr.count;
	if(f->qid.type & QTDIR)
		n = vacdirread(f, buf, off, cnt);
	else if(vacfilegetmode(f->file)&ModeDevice)
		return vtstrdup("device");
	else if(vacfilegetmode(f->file)&ModeLink)
		return vtstrdup("symbolic link");
	else if(vacfilegetmode(f->file)&ModeNamedPipe)
		return vtstrdup("named pipe");
	else
		n = vacfileread(vf, buf, cnt, off);
	if(n < 0) {
		rerrstr(err, sizeof err);
		return vtstrdup(err);
	}
	thdr.count = n;
	return 0;
}

int
plumbopen(char *name, int omode)
{
	int fd;
	char buf[128], err[ERRMAX];

	if(name[0] == '/')
		return open(name, omode);

	if(access("/mnt/plumb/send", AWRITE) < 0)
		return -1;

	snprint(buf, sizeof buf, "/mnt/plumb/%s", name);
	fd = open(buf, omode);
	if(fd >= 0)
		return fd;

	/* try creating port; used by non-standard plumb implementations */
	rerrstr(err, sizeof err);
	fd = create(buf, omode, 0600);
	if(fd >= 0)
		return fd;
	errstr(err, sizeof err);

	return -1;
}

VtSession *
vtDial(char *host, int canfail)
{
	VtSession *z;
	int fd;
	char *na;
	char e[ERRMAX];

	if(host == nil) 
		host = getenv("venti");
	if(host == nil)
		host = "$venti";

	if (host == nil) {
		if (!canfail)
			werrstr("no venti host set");
		na = "";
		fd = -1;
	} else {
		na = netmkaddr(host, 0, "venti");
		fd = dial(na, 0, 0, 0);
	}
	if(fd < 0){
		rerrstr(e, sizeof e);
		if(!canfail){
			vtSetError("venti dialstring %s: %s", na, e);
			return nil;
		}
	}
	z = vtClientAlloc();
	if(fd < 0)
		strcpy(z->fderror, e);
	vtSetFd(z, fd);
	return z;
}

/*
 *  this just proxies what the factotum tells it to.
 */
AuthInfo*
fsfauth_proxy(CFid *fid, AuthRpc *rpc, AuthGetkey *getkey, char *params)
{
	char *buf;
	int m, n, ret;
	AuthInfo *a;
	char oerr[ERRMAX];

	rerrstr(oerr, sizeof oerr);
	werrstr("UNKNOWN AUTH ERROR");

	if(dorpc(rpc, "start", params, strlen(params), getkey) != ARok){
		werrstr("fauth_proxy start: %r");
		return nil;
	}

	buf = malloc(AuthRpcMax);
	if(buf == nil)
		return nil;
	for(;;){
		switch(dorpc(rpc, "read", nil, 0, getkey)){
		case ARdone:
			free(buf);
			a = auth_getinfo(rpc);
			errstr(oerr, sizeof oerr);	/* no error, restore whatever was there */
			return a;
		case ARok:
			if(fswrite(fid, rpc->arg, rpc->narg) != rpc->narg){
				werrstr("auth_proxy write fid: %r");
				goto Error;
			}
			break;
		case ARphase:
			n = 0;
			memset(buf, 0, AuthRpcMax);
			while((ret = dorpc(rpc, "write", buf, n, getkey)) == ARtoosmall){
				if(atoi(rpc->arg) > AuthRpcMax)
					break;
				m = fsread(fid, buf+n, atoi(rpc->arg)-n);
				if(m <= 0){
					if(m == 0)
						werrstr("auth_proxy short read: %s", buf);
					goto Error;
				}
				n += m;
			}
			if(ret != ARok){
				werrstr("auth_proxy rpc write: %s: %r", buf);
				goto Error;
			}
			break;
		default:
			werrstr("auth_proxy rpc: %r");
			goto Error;
		}
	}
Error:
	free(buf);
	return nil;
}

char*
rattach(Fid *f)
{
	/* no authentication for the momment */
	VacFile *file;
	char err[80];

	file = vacfsgetroot(fs);
	if(file == nil) {
		rerrstr(err, sizeof err);
		return vtstrdup(err);
	}

	f->busy = 1;
	f->file = file;
	f->qid.path = vacfilegetid(f->file);
	f->qid.vers = 0;
	f->qid.type = QTDIR;
	thdr.qid = f->qid;
	if(rhdr.uname[0])
		f->user = vtstrdup(rhdr.uname);
	else
		f->user = "none";
	return 0;
}

char*
geterrstr(void)
{
	static char errbuf[ERRMAX];

	rerrstr(errbuf, sizeof errbuf);
	return errbuf;
}

void
responderror(Req *r)
{
	char errbuf[ERRMAX];
	
	rerrstr(errbuf, sizeof errbuf);
	respond(r, errbuf);
}

int
errfmt(Fmt *f)
{
	char buf[ERRMAX];

	rerrstr(buf, sizeof buf);
	return _fmtcpy(f, buf, utflen(buf), strlen(buf));
}

static int
wasintr(void)
{
	char err[64];

	rerrstr(err, sizeof err);
	return strstr(err, "interrupt") != 0;
}

void
responderrstr(Req *r)
{
	char err[ERRMAX];
	
	rerrstr(err, sizeof err);
	respond(r, err);
}

/* Taken from imapdial, replaces tlsclient call with stunnel */
static int
smtpdial(char *server)
{
	int p[2];
	int fd[3];
	char *tmp;
	char *fpath;

	if(pipe(p) < 0)
		return -1;
	fd[0] = dup(p[0], -1);
	fd[1] = dup(p[0], -1);
	fd[2] = dup(2, -1);
#ifdef PLAN9PORT
	tmp = smprint("%s:587", server);
	fpath = searchpath("stunnel3");
	if (!fpath) {
		werrstr("stunnel not found. it is required for tls support.");
		return -1;
	}
	if(threadspawnl(fd, fpath, "stunnel", "-n", "smtp" , "-c", "-r", tmp, nil) < 0) {
#else
	tmp = smprint("tcp!%s!587", server);
	if(threadspawnl(fd, "/bin/tlsclient", "tlsclient", tmp, nil) < 0){
#endif
		free(tmp);
		close(p[0]);
		close(p[1]);
		close(fd[0]);
		close(fd[1]);
		close(fd[2]);
		return -1;
	}
	free(tmp);
	close(p[0]);
	return p[1];
}

int
mxdial(char *addr, char *ddomain, char *gdomain)
{
	int fd;
	DS ds;
	char err[Errlen];

	addr = netmkaddr(addr, 0, "smtp");
	dial_string_parse(addr, &ds);

	/* try connecting to destination or any of it's mail routers */
	fd = callmx(&ds, addr, ddomain);

	/* try our mail gateway */
	rerrstr(err, sizeof(err));
	if(fd < 0 && gdomain && strstr(err, "can't translate") != 0)
		fd = dial(netmkaddr(gdomain, 0, "smtp"), 0, 0, 0);

	return fd;
}

static void
xioproc(void *a)
{
	Channel *c;
	Ioproc *io;
	Iocall *r;

	c = a;
	if(io = mallocz(sizeof(*io), 1)){
		char buf[128];

		/*
		 * open might fail, ignore it for programs like factotum
		 * that don't use iointerrupt() anyway.
		 */
		snprint(buf, sizeof(buf), "/proc/%d/ctl", getpid());
		io->ctl = open(buf, OWRITE);

		if((io->creply = chancreate(sizeof(void*), 0)) == nil){
			if(io->ctl >= 0)
				close(io->ctl);
			free(io);
			io = nil;
		} else
			io->c = c;
	}
	while(send(c, &io) < 0)
		;
	if(io == nil)
		return;

	for(;;){
		while(recv(io->c, &r) < 0)
			;
		if(r == 0)
			break;
		if(io->intr){
			r->ret = -1;
			strcpy(r->err, "interrupted");
		} else if((r->ret = r->op(&r->arg)) < 0)
			rerrstr(r->err, sizeof r->err);
		qlock(io);
		if(io->intr){
			io->intr = 0;
			if(io->ctl >= 0)
				write(io->ctl, "nointerrupt", 11);
		}
		while(send(io->creply, &r) < 0)
			;
		qunlock(io);
	}

	if(io->ctl >= 0)
		close(io->ctl);
	chanfree(io->c);
	chanfree(io->creply);
	free(io);
}