From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=57636 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Pk8j6-0003p7-5R for qemu-devel@nongnu.org; Tue, 01 Feb 2011 00:24:29 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Pk8j3-0006Ni-Ne for qemu-devel@nongnu.org; Tue, 01 Feb 2011 00:24:26 -0500 Received: from e28smtp05.in.ibm.com ([122.248.162.5]:59897) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Pk8j3-0006Mu-37 for qemu-devel@nongnu.org; Tue, 01 Feb 2011 00:24:25 -0500 Received: from d28relay03.in.ibm.com (d28relay03.in.ibm.com [9.184.220.60]) by e28smtp05.in.ibm.com (8.14.4/8.13.1) with ESMTP id p115ON8F026095 for ; Tue, 1 Feb 2011 10:54:23 +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 p115OMIS3907678 for ; Tue, 1 Feb 2011 10:54:22 +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 p115OMs8014411 for ; Tue, 1 Feb 2011 16:24:22 +1100 Received: from explorer.in.ibm.com ([9.124.35.46]) by d28av04.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVin) with ESMTP id p115OM6n014402 for ; Tue, 1 Feb 2011 16:24:22 +1100 From: "M. Mohan Kumar" Date: Tue, 1 Feb 2011 10:54:22 +0530 Message-Id: <1296537862-16561-1-git-send-email-mohan@in.ibm.com> In-Reply-To: <1296537693-16406-1-git-send-email-mohan@in.ibm.com> References: <1296537693-16406-1-git-send-email-mohan@in.ibm.com> Subject: [Qemu-devel] [V4 PATCH 1/8] virtio-9p: Implement 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 | 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 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 -- 1.7.3.4