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[93.34.218.143]) by mx.google.com with ESMTPS id p2sm1192306wbo.17.2011.10.05.00.17.51 (version=TLSv1/SSLv3 cipher=OTHER); Wed, 05 Oct 2011 00:17:51 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Date: Wed, 5 Oct 2011 09:17:33 +0200 Message-Id: <1317799065-29668-4-git-send-email-pbonzini@redhat.com> X-Mailer: git-send-email 1.7.6 In-Reply-To: <1317799065-29668-1-git-send-email-pbonzini@redhat.com> References: <1317799065-29668-1-git-send-email-pbonzini@redhat.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Received-From: 74.125.82.53 Subject: [Qemu-devel] [PATCH v3 03/15] add qemu_send_full and qemu_recv_full X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Signed-off-by: Paolo Bonzini --- osdep.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ qemu-common.h | 4 +++ 2 files changed, 71 insertions(+), 0 deletions(-) diff --git a/osdep.c b/osdep.c index 56e6963..718a25d 100644 --- a/osdep.c +++ b/osdep.c @@ -166,3 +166,70 @@ int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen) return ret; } + +/* + * A variant of send(2) which handles partial write. + * + * Return the number of bytes transferred, which is only + * smaller than `count' if there is an error. + * + * This function won't work with non-blocking fd's. + * Any of the possibilities with non-bloking fd's is bad: + * - return a short write (then name is wrong) + * - busy wait adding (errno == EAGAIN) to the loop + */ +ssize_t qemu_send_full(int fd, const void *buf, size_t count, int flags) +{ + ssize_t ret = 0; + ssize_t total = 0; + + while (count) { + ret = send(fd, buf, count, flags); + if (ret < 0) { + if (errno == EINTR) { + continue; + } + break; + } + + count -= ret; + buf += ret; + total += ret; + } + + return total; +} + +/* + * A variant of recv(2) which handles partial write. + * + * Return the number of bytes transferred, which is only + * smaller than `count' if there is an error. + * + * This function won't work with non-blocking fd's. + * Any of the possibilities with non-bloking fd's is bad: + * - return a short write (then name is wrong) + * - busy wait adding (errno == EAGAIN) to the loop + */ +ssize_t qemu_recv_full(int fd, const void *buf, size_t count, int flags) +{ + ssize_t ret = 0; + ssize_t total = 0; + + while (count) { + ret = recv(fd, buf, count, flags); + if (ret <= 0) { + if (ret < 0 && errno == EINTR) { + continue; + } + break; + } + + count -= ret; + buf += ret; + total += ret; + } + + return total; +} + diff --git a/qemu-common.h b/qemu-common.h index 5e87bdf..ed9112a 100644 --- a/qemu-common.h +++ b/qemu-common.h @@ -189,6 +189,10 @@ 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_send_full(int fd, const void *buf, size_t count, int flags) + QEMU_WARN_UNUSED_RESULT; +ssize_t qemu_recv_full(int fd, const void *buf, size_t count, int flags) + QEMU_WARN_UNUSED_RESULT; void qemu_set_cloexec(int fd); #ifndef _WIN32