From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=39714 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PLJ86-0002bV-0w for qemu-devel@nongnu.org; Wed, 24 Nov 2010 12:28:59 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PLIzt-0006NZ-1P for qemu-devel@nongnu.org; Wed, 24 Nov 2010 12:20:15 -0500 Received: from e23smtp04.au.ibm.com ([202.81.31.146]:51511) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PLIzs-0006Kp-HF for qemu-devel@nongnu.org; Wed, 24 Nov 2010 12:19:09 -0500 Received: from d23relay03.au.ibm.com (d23relay03.au.ibm.com [202.81.31.245]) by e23smtp04.au.ibm.com (8.14.4/8.13.1) with ESMTP id oAOHE1e6028998 for ; Thu, 25 Nov 2010 04:14:01 +1100 Received: from d23av04.au.ibm.com (d23av04.au.ibm.com [9.190.235.139]) by d23relay03.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id oAOHJ13u1527934 for ; Thu, 25 Nov 2010 04:19:01 +1100 Received: from d23av04.au.ibm.com (loopback [127.0.0.1]) by d23av04.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id oAOHJ1TM024160 for ; Thu, 25 Nov 2010 04:19:01 +1100 Received: from localhost.localdomain ([9.77.94.25]) by d23av04.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id oAOHJ03U024148 for ; Thu, 25 Nov 2010 04:19:00 +1100 From: "M. Mohan Kumar" Date: Wed, 24 Nov 2010 22:48:59 +0530 Message-Id: <1290619139-5634-1-git-send-email-mohan@in.ibm.com> Subject: [Qemu-devel] [PATCH] Add qemu_read_full List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "qemu-devel@nongnu.org" Add qemu_read_full function Signed-off-by: M. Mohan Kumar --- osdep.c | 29 +++++++++++++++++++++++++++++ qemu-common.h | 2 ++ 2 files changed, 31 insertions(+), 0 deletions(-) diff --git a/osdep.c b/osdep.c index 327583b..7046b32 100644 --- a/osdep.c +++ b/osdep.c @@ -127,6 +127,35 @@ 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. + * + */ +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 b3957f1..0f60e08 100644 --- a/qemu-common.h +++ b/qemu-common.h @@ -190,6 +190,8 @@ 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 -- 1.7.0.4