static int
doflush(struct puffs_usermount *pu, puffs_cookie_t cookie, int op,
off_t start, off_t end)
{
struct puffs_framebuf *pb;
struct puffs_flush *pf;
size_t winlen;
int rv;
pb = puffs_framebuf_make();
if (pb == NULL)
return ENOMEM;
winlen = sizeof(struct puffs_flush);
if ((rv = puffs_framebuf_getwindow(pb, 0, (void *)&pf, &winlen)) == -1)
goto out;
assert(winlen == sizeof(struct puffs_flush));
pf->pf_req.preq_buflen = sizeof(struct puffs_flush);
pf->pf_req.preq_opclass = PUFFSOP_FLUSH;
pf->pf_req.preq_id = puffs__nextreq(pu);
pf->pf_op = op;
pf->pf_cookie = cookie;
pf->pf_start = start;
pf->pf_end = end;
rv = puffs_framev_enqueue_cc(puffs_cc_getcc(pu),
puffs_getselectable(pu), pb, 0);
out:
puffs_framebuf_destroy(pb);
return rv;
}
/* no memory allocation, direct copy */
int
psbuf_do_data(struct puffs_framebuf *pb, uint8_t *data, uint32_t *dlen)
{
void *win;
size_t bufoff, winlen;
uint32_t len, dataoff;
if (psbuf_get_type(pb) != SSH_FXP_DATA) {
uint32_t val;
if (psbuf_get_type(pb) != SSH_FXP_STATUS)
return INVALRESPONSE;
if (psbuf_get_4(pb, &val) != 0)
return INVALRESPONSE;
if (val != SSH_FX_EOF)
return sftperr_to_errno(val);
*dlen = 0;
return 0;
}
if (psbuf_get_4(pb, &len) != 0)
return INVALRESPONSE;
if (*dlen < len)
return EINVAL;
*dlen = 0;
dataoff = 0;
while (dataoff < len) {
winlen = len-dataoff;
bufoff = puffs_framebuf_telloff(pb);
if (puffs_framebuf_getwindow(pb, bufoff,
&win, &winlen) == -1)
return EINVAL;
if (winlen == 0)
break;
memcpy(data + dataoff, win, winlen);
dataoff += winlen;
}
*dlen = dataoff;
return 0;
}
int
psbuf_read(struct puffs_usermount *pu, struct puffs_framebuf *pb,
int fd, int *done)
{
void *win;
ssize_t n;
size_t howmuch, winlen;
int lenstate;
the_next_level:
if ((lenstate = READSTATE_LENGTH(CUROFF(pb))))
howmuch = 4 - CUROFF(pb);
else
howmuch = psbuf_get_len(pb) - (CUROFF(pb) - 4);
if (puffs_framebuf_reserve_space(pb, howmuch) == -1)
return errno;
while (howmuch) {
winlen = howmuch;
if (puffs_framebuf_getwindow(pb, CUROFF(pb), &win, &winlen)==-1)
return errno;
n = recv(fd, win, winlen, MSG_NOSIGNAL);
switch (n) {
case 0:
return ECONNRESET;
case -1:
if (errno == EAGAIN)
return 0;
return errno;
default:
howmuch -= n;
puffs_framebuf_seekset(pb, CUROFF(pb) + n);
break;
}
}
if (!lenstate) {
/* XXX: initial exchange shorter.. but don't worry, be happy */
puffs_framebuf_seekset(pb, 9);
*done = 1;
return 0;
} else
goto the_next_level;
}
int
psbuf_write(struct puffs_usermount *pu, struct puffs_framebuf *pb,
int fd, int *done)
{
void *win;
ssize_t n;
size_t winlen, howmuch;
/* finalize buffer.. could be elsewhere ... */
if (CUROFF(pb) == 0) {
uint32_t len;
len = htobe32(puffs_framebuf_tellsize(pb) - 4);
puffs_framebuf_putdata_atoff(pb, 0, &len, 4);
}
howmuch = puffs_framebuf_tellsize(pb) - CUROFF(pb);
while (howmuch) {
winlen = howmuch;
if (puffs_framebuf_getwindow(pb, CUROFF(pb), &win, &winlen)==-1)
return errno;
n = send(fd, win, winlen, MSG_NOSIGNAL);
switch (n) {
case 0:
return ECONNRESET;
case -1:
if (errno == EAGAIN)
return 0;
return errno;
default:
howmuch -= n;
puffs_framebuf_seekset(pb, CUROFF(pb) + n);
break;
}
}
*done = 1;
return 0;
}