From patchwork Tue Oct 30 08:32:42 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [v3,06/35] osdep: add qemu_read_full() to read interrupt-safely From: Isaku Yamahata X-Patchwork-Id: 195357 Message-Id: <57bbf61835e29be17e90937bf87c44140b64f958.1351582535.git.yamahata@valinux.co.jp> To: qemu-devel@nongnu.org, kvm@vger.kernel.org Cc: benoit.hudzia@gmail.com, aarcange@redhat.com, aliguori@us.ibm.com, quintela@redhat.com, stefanha@gmail.com, t.hirofuchi@aist.go.jp, dlaor@redhat.com, satoshi.itoh@aist.go.jp, mdroth@linux.vnet.ibm.com, yoshikawa.takuya@oss.ntt.co.jp, owasserm@redhat.com, avi@redhat.com, pbonzini@redhat.com, chegu_vinod@hp.com Date: Tue, 30 Oct 2012 17:32:42 +0900 This is read counter part of qemu_write_full(). Signed-off-by: Isaku Yamahata --- osdep.c | 24 ++++++++++++++++++++++++ qemu-common.h | 2 ++ 2 files changed, 26 insertions(+) diff --git a/osdep.c b/osdep.c index 3b25297..416ffe1 100644 --- a/osdep.c +++ b/osdep.c @@ -261,6 +261,30 @@ ssize_t qemu_write_full(int fd, const void *buf, size_t count) return total; } +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; + } + if (ret == 0) { + break; + } + + count -= ret; + buf += ret; + total += ret; + } + + return total; +} + /* * Opens a socket with FD_CLOEXEC set */ diff --git a/qemu-common.h b/qemu-common.h index b54612b..16128c5 100644 --- a/qemu-common.h +++ b/qemu-common.h @@ -214,6 +214,8 @@ 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_read_full(int fd, void *buf, size_t count) + QEMU_WARN_UNUSED_RESULT; ssize_t qemu_recv_full(int fd, void *buf, size_t count, int flags) QEMU_WARN_UNUSED_RESULT;