diff options
Diffstat (limited to 'io')
| -rw-r--r-- | io/channel-file.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/io/channel-file.c b/io/channel-file.c index f91bf6db1c..a6ad7770c6 100644 --- a/io/channel-file.c +++ b/io/channel-file.c @@ -146,6 +146,58 @@ static ssize_t qio_channel_file_writev(QIOChannel *ioc, return ret; } +#ifdef CONFIG_PREADV +static ssize_t qio_channel_file_preadv(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 = preadv(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 read from file"); + return -1; + } + + return ret; +} + +static 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; +} +#endif /* CONFIG_PREADV */ + static int qio_channel_file_set_blocking(QIOChannel *ioc, bool enabled, Error **errp) @@ -231,6 +283,10 @@ static void qio_channel_file_class_init(ObjectClass *klass, ioc_klass->io_writev = qio_channel_file_writev; ioc_klass->io_readv = qio_channel_file_readv; ioc_klass->io_set_blocking = qio_channel_file_set_blocking; +#ifdef CONFIG_PREADV + ioc_klass->io_pwritev = qio_channel_file_pwritev; + ioc_klass->io_preadv = qio_channel_file_preadv; +#endif ioc_klass->io_seek = qio_channel_file_seek; ioc_klass->io_close = qio_channel_file_close; ioc_klass->io_create_watch = qio_channel_file_create_watch; |