On 10/14/2011 12:16 PM, Paolo Bonzini wrote:
On 10/14/2011 11:52 AM, Kevin Wolf wrote:
Am 05.10.2011 09:17, schrieb Paolo Bonzini:
Signed-off-by: Paolo Bonzini<pbonz...@redhat.com>
---
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);
osdep.c: In function 'qemu_recv_full':
osdep.c:220: error: passing argument 2 of 'recv' discards qualifiers
from pointer target type
/usr/include/bits/socket2.h:35: note: expected 'void *' but argument is
of type 'const void *'
It's fixed in 4/15's osdep.c. I attach the diff, and pushed the fixed
version to github nbd-trim.
Also, all branches there are now rebased on top of block branch.
Let's keep this out of 1.0 (having to choose I very much choose scsi
over nbd! :)). I'll try to get all the prerequisites in though, so that
they will get thorough testing and the nbd parts will be easier to
manage afterwards.
Paolo
