From mboxrd@z Thu Jan 1 00:00:00 1970 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 From: "M. Mohan Kumar" Date: Mon, 5 Sep 2011 21:48:22 +0530 Message-Id: <1315239516-4451-2-git-send-email-mohan@in.ibm.com> In-Reply-To: <1315239516-4451-1-git-send-email-mohan@in.ibm.com> References: <1315239516-4451-1-git-send-email-mohan@in.ibm.com> Subject: [Qemu-devel] [PATCH V12 01/15] Implement qemu_read_full List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, Anthony Liguori , Stefan Hajnoczi 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 -- 1.7.6