From patchwork Thu Mar 31 08:21:28 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: 89033 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [199.232.76.165]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 03109B6EEA for ; Thu, 31 Mar 2011 19:36:36 +1100 (EST) Received: from localhost ([127.0.0.1]:35203 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Q5DMl-0002d3-8g for incoming@patchwork.ozlabs.org; Thu, 31 Mar 2011 04:36:31 -0400 Received: from [140.186.70.92] (port=52633 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Q5DFJ-0007kE-Ny for qemu-devel@nongnu.org; Thu, 31 Mar 2011 04:28:51 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Q5DFD-00070U-SB for qemu-devel@nongnu.org; Thu, 31 Mar 2011 04:28:48 -0400 Received: from e28smtp02.in.ibm.com ([122.248.162.2]:43741) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Q5DFD-0006zx-4o for qemu-devel@nongnu.org; Thu, 31 Mar 2011 04:28:43 -0400 Received: from d28relay03.in.ibm.com (d28relay03.in.ibm.com [9.184.220.60]) by e28smtp02.in.ibm.com (8.14.4/8.13.1) with ESMTP id p2V8LfuM026662 for ; Thu, 31 Mar 2011 13:51:41 +0530 Received: from d28av04.in.ibm.com (d28av04.in.ibm.com [9.184.220.66]) by d28relay03.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p2V8LfVs3412072 for ; Thu, 31 Mar 2011 13:51:41 +0530 Received: from d28av04.in.ibm.com (loopback [127.0.0.1]) by d28av04.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p2V8Le29002816 for ; Thu, 31 Mar 2011 19:21:41 +1100 Received: from explorer.in.ibm.com ([9.124.35.24]) by d28av04.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id p2V8LeCm002810; Thu, 31 Mar 2011 19:21:40 +1100 From: "M. Mohan Kumar" To: qemu-devel@nongnu.org, Stefan Hajnoczi Date: Thu, 31 Mar 2011 13:51:28 +0530 Message-Id: <1301559700-6742-2-git-send-email-mohan@in.ibm.com> X-Mailer: git-send-email 1.7.4 In-Reply-To: <1301559700-6742-1-git-send-email-mohan@in.ibm.com> References: <1301559700-6742-1-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: 122.248.162.2 Cc: Subject: [Qemu-devel] [V10 PATCH 01/13] Implement qemu_read_full X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Add qemu_read_full function 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 327583b..8d84a88 100644 --- a/osdep.c +++ b/osdep.c @@ -127,6 +127,38 @@ 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 40dad52..325b16a 100644 --- a/qemu-common.h +++ b/qemu-common.h @@ -207,6 +207,8 @@ 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