@@ -89,4 +89,9 @@ qio_channel_file_new_path(const char *path,
mode_t mode,
Error **errp);
+ssize_t qio_channel_file_pwritev(QIOChannel *ioc,
+ const struct iovec *iov,
+ size_t niov,
+ off_t offset,
+ Error **errp);
#endif /* QIO_CHANNEL_FILE_H */
@@ -136,6 +136,30 @@ static ssize_t qio_channel_file_writev(QIOChannel *ioc,
return ret;
}
+ssize_t qio_channel_file_pwritev(QIOChannel *ioc,
+ const struct iovec *iov,
+ size_t niov,
+ off_t offset,
+ Error **errp)
+{
+ QIOChannelFile *fioc = QIO_CHANNEL_FILE(ioc);
+ ssize_t ret;
+
+ retry:
+ ret = pwritev(fioc->fd, iov, niov, offset);
+ if (ret <= 0) {
+ if (errno == EAGAIN) {
+ return QIO_CHANNEL_ERR_BLOCK;
+ }
+ if (errno == EINTR) {
+ goto retry;
+ }
+ error_setg_errno(errp, errno, "Unable to write to file");
+ return -1;
+ }
+ return ret;
+}
+
static int qio_channel_file_set_blocking(QIOChannel *ioc,
bool enabled,
Error **errp)
The upcoming 'fixed-ram' feature would require qemu to write data at specific offsets of the file. This is currently missing so this patch adds it. I've chosen to implement it as a type-specific function rather than plumb it through the generic channel interface as it relies on being able to do seeks. Signed-off-by: Nikolay Borisov <nborisov@suse.com> --- include/io/channel-file.h | 5 +++++ io/channel-file.c | 24 ++++++++++++++++++++++++ 2 files changed, 29 insertions(+)