From patchwork Mon Sep 5 16:18:22 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mohan Kumar M X-Patchwork-Id: 113411 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [140.186.70.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 3DB86B6F7C for ; Tue, 6 Sep 2011 03:10:08 +1000 (EST) Received: from localhost ([::1]:35468 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1R0bta-0007WY-Oj for incoming@patchwork.ozlabs.org; Mon, 05 Sep 2011 12:19:38 -0400 Received: from eggs.gnu.org ([140.186.70.92]:54904) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1R0bst-0005uT-5S for qemu-devel@nongnu.org; Mon, 05 Sep 2011 12:18:56 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1R0bsr-0005I3-HA for qemu-devel@nongnu.org; Mon, 05 Sep 2011 12:18:54 -0400 Received: from e28smtp06.in.ibm.com ([122.248.162.6]:53289) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1R0bsq-0005D0-Ru for qemu-devel@nongnu.org; Mon, 05 Sep 2011 12:18:53 -0400 Received: from d28relay03.in.ibm.com (d28relay03.in.ibm.com [9.184.220.60]) by e28smtp06.in.ibm.com (8.14.4/8.13.1) with ESMTP id p85GIcMn030438 for ; Mon, 5 Sep 2011 21:48:38 +0530 Received: from d28av05.in.ibm.com (d28av05.in.ibm.com [9.184.220.67]) by d28relay03.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p85GIcjT3739710 for ; Mon, 5 Sep 2011 21:48:38 +0530 Received: from d28av05.in.ibm.com (loopback [127.0.0.1]) by d28av05.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p85GIbD8029121 for ; Tue, 6 Sep 2011 02:18:37 +1000 Received: from explorer.in.ibm.com ([9.79.187.208]) by d28av05.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id p85GIbFm029092; Tue, 6 Sep 2011 02:18:37 +1000 From: "M. Mohan Kumar" To: qemu-devel@nongnu.org, Anthony Liguori , Stefan Hajnoczi Date: Mon, 5 Sep 2011 21:48:22 +0530 Message-Id: <1315239516-4451-2-git-send-email-mohan@in.ibm.com> X-Mailer: git-send-email 1.7.6 In-Reply-To: <1315239516-4451-1-git-send-email-mohan@in.ibm.com> References: <1315239516-4451-1-git-send-email-mohan@in.ibm.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-Received-From: 122.248.162.6 Subject: [Qemu-devel] [PATCH V12 01/15] Implement qemu_read_full X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Signed-off-by: M. Mohan Kumar --- osdep.c | 32 ++++++++++++++++++++++++++++++++ qemu-common.h | 2 ++ 2 files changed, 34 insertions(+), 0 deletions(-) diff --git a/osdep.c b/osdep.c index 56e6963..5a4d670 100644 --- a/osdep.c +++ b/osdep.c @@ -126,6 +126,38 @@ ssize_t qemu_write_full(int fd, const void *buf, size_t count) } /* + * A variant of read(2) which handles interrupted read. + * Simlar to qemu_write_full function + * + * Return the number of bytes read. + * + * This function does not work with non-blocking fd's. + * errno is set if fewer than `count' bytes are read because of any + * error + */ +ssize_t qemu_read_full(int fd, void *buf, size_t count) +{ + ssize_t ret = 0; + ssize_t total = 0; + + while (count) { + ret = read(fd, buf, count); + if (ret <= 0) { + if (errno == EINTR) { + continue; + } + break; + } + + count -= ret; + buf += ret; + total += ret; + } + + return total; +} + +/* * Opens a socket with FD_CLOEXEC set */ int qemu_socket(int domain, int type, int protocol) diff --git a/qemu-common.h b/qemu-common.h index 404c421..d6aabd2 100644 --- a/qemu-common.h +++ b/qemu-common.h @@ -189,6 +189,8 @@ void qemu_mutex_unlock_iothread(void); int qemu_open(const char *name, int flags, ...); ssize_t qemu_write_full(int fd, const void *buf, size_t count) QEMU_WARN_UNUSED_RESULT; +ssize_t qemu_read_full(int fd, void *buf, size_t count) + QEMU_WARN_UNUSED_RESULT; void qemu_set_cloexec(int fd); #ifndef _WIN32