static void
handle_pread (char *own_buf, int *new_packet_len)
{
int fd, ret, len, offset, bytes_sent;
char *p, *data;
p = own_buf + strlen ("vFile:pread:");
if (require_int (&p, &fd)
|| require_comma (&p)
|| require_valid_fd (fd)
|| require_int (&p, &len)
|| require_comma (&p)
|| require_int (&p, &offset)
|| require_end (p))
{
hostio_packet_error (own_buf);
return;
}
data = xmalloc (len);
#ifdef HAVE_PREAD
ret = pread (fd, data, len, offset);
#else
ret = -1;
#endif
/* If we have no pread or it failed for this file, use lseek/read. */
if (ret == -1)
{
ret = lseek (fd, offset, SEEK_SET);
if (ret != -1)
ret = read (fd, data, len);
}
if (ret == -1)
{
hostio_error (own_buf);
free (data);
return;
}
bytes_sent = hostio_reply_with_data (own_buf, data, ret, new_packet_len);
/* If we were using read, and the data did not all fit in the reply,
we would have to back up using lseek here. With pread it does
not matter. But we still have a problem; the return value in the
packet might be wrong, so we must fix it. This time it will
definitely fit. */
if (bytes_sent < ret)
bytes_sent = hostio_reply_with_data (own_buf, data, bytes_sent,
new_packet_len);
free (data);
}
static void
handle_open (char *own_buf)
{
char filename[HOSTIO_PATH_MAX];
char *p;
int fileio_flags, fileio_mode, flags, fd;
mode_t mode;
struct fd_list *new_fd;
p = own_buf + strlen ("vFile:open:");
if (require_filename (&p, filename)
|| require_comma (&p)
|| require_int (&p, &fileio_flags)
|| require_comma (&p)
|| require_int (&p, &fileio_mode)
|| require_end (p)
|| fileio_to_host_openflags (fileio_flags, &flags)
|| fileio_to_host_mode (fileio_mode, &mode))
{
hostio_packet_error (own_buf);
return;
}
/* We do not need to convert MODE, since the fileio protocol
uses the standard values. */
if (hostio_fs_pid != 0 && the_target->multifs_open != NULL)
fd = the_target->multifs_open (hostio_fs_pid, filename,
flags, mode);
else
fd = open (filename, flags, mode);
if (fd == -1)
{
hostio_error (own_buf);
return;
}
/* Record the new file descriptor. */
new_fd = xmalloc (sizeof (struct fd_list));
new_fd->fd = fd;
new_fd->next = open_fds;
open_fds = new_fd;
hostio_reply (own_buf, fd);
}
static void
handle_pwrite (char *own_buf, int packet_len)
{
int fd, ret, len, offset;
char *p, *data;
p = own_buf + strlen ("vFile:pwrite:");
if (require_int (&p, &fd)
|| require_comma (&p)
|| require_valid_fd (fd)
|| require_int (&p, &offset)
|| require_comma (&p)
|| require_data (p, packet_len - (p - own_buf), &data, &len))
{
hostio_packet_error (own_buf);
return;
}
#ifdef HAVE_PWRITE
ret = pwrite (fd, data, len, offset);
#else
ret = -1;
#endif
/* If we have no pwrite or it failed for this file, use lseek/write. */
if (ret == -1)
{
ret = lseek (fd, offset, SEEK_SET);
if (ret != -1)
ret = write (fd, data, len);
}
if (ret == -1)
{
hostio_error (own_buf);
free (data);
return;
}
hostio_reply (own_buf, ret);
free (data);
}
static void
handle_open (char *own_buf)
{
char filename[PATH_MAX];
char *p;
int fileio_flags, mode, flags, fd;
struct fd_list *new_fd;
p = own_buf + strlen ("vFile:open:");
if (require_filename (&p, filename)
|| require_comma (&p)
|| require_int (&p, &fileio_flags)
|| require_comma (&p)
|| require_int (&p, &mode)
|| require_end (p)
|| fileio_open_flags_to_host (fileio_flags, &flags))
{
hostio_packet_error (own_buf);
return;
}
/* We do not need to convert MODE, since the fileio protocol
uses the standard values. */
fd = open (filename, flags, mode);
if (fd == -1)
{
hostio_error (own_buf);
return;
}
/* Record the new file descriptor. */
new_fd = xmalloc (sizeof (struct fd_list));
new_fd->fd = fd;
new_fd->next = open_fds;
open_fds = new_fd;
hostio_reply (own_buf, fd);
}
static void
handle_pread (char *own_buf, int *new_packet_len)
{
int fd, ret, len, offset, bytes_sent;
char *p, *data;
static int max_reply_size = -1;
p = own_buf + strlen ("vFile:pread:");
if (require_int (&p, &fd)
|| require_comma (&p)
|| require_valid_fd (fd)
|| require_int (&p, &len)
|| require_comma (&p)
|| require_int (&p, &offset)
|| require_end (p))
{
hostio_packet_error (own_buf);
return;
}
/* Do not attempt to read more than the maximum number of bytes
hostio_reply_with_data can fit in a packet. We may still read
too much because of escaping, but this is handled below. */
if (max_reply_size == -1)
{
sprintf (own_buf, "F%x;", PBUFSIZ);
max_reply_size = PBUFSIZ - strlen (own_buf);
}
if (len > max_reply_size)
len = max_reply_size;
data = xmalloc (len);
#ifdef HAVE_PREAD
ret = pread (fd, data, len, offset);
#else
ret = -1;
#endif
/* If we have no pread or it failed for this file, use lseek/read. */
if (ret == -1)
{
ret = lseek (fd, offset, SEEK_SET);
if (ret != -1)
ret = read (fd, data, len);
}
if (ret == -1)
{
hostio_error (own_buf);
free (data);
return;
}
bytes_sent = hostio_reply_with_data (own_buf, data, ret, new_packet_len);
/* If we were using read, and the data did not all fit in the reply,
we would have to back up using lseek here. With pread it does
not matter. But we still have a problem; the return value in the
packet might be wrong, so we must fix it. This time it will
definitely fit. */
if (bytes_sent < ret)
bytes_sent = hostio_reply_with_data (own_buf, data, bytes_sent,
new_packet_len);
free (data);
}