From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56387) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cnPL8-0004FO-IW for qemu-devel@nongnu.org; Mon, 13 Mar 2017 08:44:43 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cnPL7-0005oS-HP for qemu-devel@nongnu.org; Mon, 13 Mar 2017 08:44:42 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38096) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cnPL7-0005ne-94 for qemu-devel@nongnu.org; Mon, 13 Mar 2017 08:44:41 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 63F396AAC7 for ; Mon, 13 Mar 2017 12:44:41 +0000 (UTC) From: Juan Quintela Date: Mon, 13 Mar 2017 13:44:20 +0100 Message-Id: <20170313124434.1043-3-quintela@redhat.com> In-Reply-To: <20170313124434.1043-1-quintela@redhat.com> References: <20170313124434.1043-1-quintela@redhat.com> Subject: [Qemu-devel] [PATCH 02/16] qio: create new qio_channel_read_all List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: amit.shah@redhat.com, dgilbert@redhat.com It is the symmetric function from qio_channel_write_all Signed-off-by: Juan Quintela --- include/io/channel.h | 23 +++++++++++++++++++++++ io/channel.c | 37 +++++++++++++++++++++++++++++++++++++ 2 files changed, 60 insertions(+) diff --git a/include/io/channel.h b/include/io/channel.h index f786c4f..2f55831 100644 --- a/include/io/channel.h +++ b/include/io/channel.h @@ -269,6 +269,29 @@ ssize_t qio_channel_writev_full(QIOChannel *ioc, Error **errp); /** + * qio_channel_readv_all: + * @ioc: the channel object + * @iov: the array of memory regions to read data into + * @niov: the length of the @iov array + * @errp: pointer to a NULL-initialized error object + * + * Read data from the IO channel, storing it in the + * memory regions referenced by @iov. Each element + * in the @iov will be fully populated with data + * before the next one is used. The @niov parameter + * specifies the total number of elements in @iov. + * + * Returns: the number of bytes read, or -1 on error, + * or QIO_CHANNEL_ERR_BLOCK if no data is available + * and the channel is non-blocking + */ +ssize_t qio_channel_readv_all(QIOChannel *ioc, + const struct iovec *iov, + size_t niov, + Error **errp); + + +/** * qio_channel_writev_all: * @ioc: the channel object * @iov: the array of memory regions to write data from diff --git a/io/channel.c b/io/channel.c index c5a1bd5..82203ef 100644 --- a/io/channel.c +++ b/io/channel.c @@ -87,6 +87,43 @@ ssize_t qio_channel_writev_full(QIOChannel *ioc, +ssize_t qio_channel_readv_all(QIOChannel *ioc, + const struct iovec *iov, + size_t niov, + Error **errp) +{ + ssize_t done = 0; + struct iovec *local_iov = g_new(struct iovec, niov); + struct iovec *local_iov_head = local_iov; + unsigned int nlocal_iov = niov; + + nlocal_iov = iov_copy(local_iov, nlocal_iov, + iov, niov, + 0, iov_size(iov, niov)); + + while (nlocal_iov > 0) { + ssize_t len; + len = qio_channel_readv(ioc, local_iov, nlocal_iov, errp); + if (len == QIO_CHANNEL_ERR_BLOCK) { + qio_channel_wait(ioc, G_IO_OUT); + continue; + } + if (len < 0) { + error_setg_errno(errp, EIO, + "Channel was not able to read full iov"); + done = -1; + goto cleanup; + } + + iov_discard_front(&local_iov, &nlocal_iov, len); + done += len; + } + + cleanup: + g_free(local_iov_head); + return done; +} + ssize_t qio_channel_writev_all(QIOChannel *ioc, const struct iovec *iov, size_t niov, -- 2.9.3