From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:54697) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RXwwZ-00012E-Uf for qemu-devel@nongnu.org; Tue, 06 Dec 2011 10:28:33 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RXwwV-0000E8-KJ for qemu-devel@nongnu.org; Tue, 06 Dec 2011 10:28:31 -0500 Received: from mail-iy0-f173.google.com ([209.85.210.173]:40617) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RXwwV-0000A8-HE for qemu-devel@nongnu.org; Tue, 06 Dec 2011 10:28:27 -0500 Received: by mail-iy0-f173.google.com with SMTP id j26so193361iaf.4 for ; Tue, 06 Dec 2011 07:28:27 -0800 (PST) Sender: Paolo Bonzini From: Paolo Bonzini Date: Tue, 6 Dec 2011 16:27:28 +0100 Message-Id: <1323185272-2610-2-git-send-email-pbonzini@redhat.com> In-Reply-To: <1323185272-2610-1-git-send-email-pbonzini@redhat.com> References: <1323185272-2610-1-git-send-email-pbonzini@redhat.com> Subject: [Qemu-devel] [PATCH 01/25] add qemu_send_full and qemu_recv_full List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@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..70bad27 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, void *buf, size_t count, int flags) +{ + ssize_t ret = 0; + ssize_t total = 0; + + while (count) { + ret = qemu_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 44870fe..bb60a5a 100644 --- a/qemu-common.h +++ b/qemu-common.h @@ -173,6 +173,10 @@ void *qemu_oom_check(void *ptr); 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 -- 1.7.7.1