From patchwork Fri Mar 18 03:27:49 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: 87464 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 071EFB6FD7 for ; Fri, 18 Mar 2011 14:42:45 +1100 (EST) Received: from localhost ([127.0.0.1]:48045 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Q0QXW-0006t2-49 for incoming@patchwork.ozlabs.org; Thu, 17 Mar 2011 23:39:50 -0400 Received: from [140.186.70.92] (port=46696 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Q0QVE-0004r6-7W for qemu-devel@nongnu.org; Thu, 17 Mar 2011 23:37:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Q0QU0-0003HW-26 for qemu-devel@nongnu.org; Thu, 17 Mar 2011 23:36:12 -0400 Received: from e23smtp08.au.ibm.com ([202.81.31.141]:35418) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Q0QTz-0003HH-IV for qemu-devel@nongnu.org; Thu, 17 Mar 2011 23:36:12 -0400 Received: from d23relay03.au.ibm.com (d23relay03.au.ibm.com [202.81.31.245]) by e23smtp08.au.ibm.com (8.14.4/8.13.1) with ESMTP id p2I3MxKV023922 for ; Fri, 18 Mar 2011 14:22:59 +1100 Received: from d23av02.au.ibm.com (d23av02.au.ibm.com [9.190.235.138]) by d23relay03.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p2I3S6AV1040392 for ; Fri, 18 Mar 2011 14:28:06 +1100 Received: from d23av02.au.ibm.com (loopback [127.0.0.1]) by d23av02.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p2I3S5uF027013 for ; Fri, 18 Mar 2011 14:28:05 +1100 Received: from explorer.in.ibm.com ([9.79.188.54]) by d23av02.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id p2I3S3hH026958; Fri, 18 Mar 2011 14:28:04 +1100 From: "M. Mohan Kumar" To: qemu-devel@nongnu.org, Stefan Hajnoczi Date: Fri, 18 Mar 2011 08:57:49 +0530 Message-Id: <1300418881-20972-2-git-send-email-mohan@in.ibm.com> X-Mailer: git-send-email 1.7.3.4 In-Reply-To: <1300418881-20972-1-git-send-email-mohan@in.ibm.com> References: <1300418881-20972-1-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: 202.81.31.141 Cc: Subject: [Qemu-devel] [V9 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