rename qemu_sendv to iov_send, change proto and move declarations to iov.h

Rename arguments and use size_t for sizes instead of int,
from
 int
 qemu_sendv(int sockfd, struct iovec *iov,
            int len, int iov_offset)
to
 ssize_t
 iov_send(int sockfd, struct iovec *iov,
          size_t offset, size_t bytes)

The main motivation was to make it clear that length
and offset are in _bytes_, not in iov elements: it was
very confusing before, because all standard functions
which deals with iovecs expects number of iovs, not
bytes, even the fact that struct iovec has iov_len and
iov_ prefix does not help.  With "bytes" and "offset",
especially since they're now size_t, it is much more
explicit.  Also change the return type to be ssize_t
instead of int.

This also changes it to match other iov-related functons,
but not _quite_: there's still no argument indicating
where iovec ends, ie, no iov_cnt parameter as used
in iov_size() and friends.  If will be added in subsequent
patch/rewrite.

All callers of qemu_sendv() and qemu_recvv() and
related, like qemu_co_sendv() and qemu_co_recvv(),
were checked to verify that it is safe to use unsigned
datatype instead of int.

Note that the order of arguments is changed to: offset
and bytes (len and iov_offset) are swapped with each
other.  This is to make them consistent with very similar
functions from qemu_iovec family, where offset always
follows qiov, to mean the place in it to start from.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

1 files changed, 3 insertions, 2 deletions

diff --git a/qemu-coroutine-io.c b/qemu-coroutine-io.c
index 40fd514395..0461a9aae6 100644
--- a/qemu-coroutine-io.c
+++ b/qemu-coroutine-io.c
@@ -25,6 +25,7 @@
 #include "qemu-common.h"
 #include "qemu_socket.h"
 #include "qemu-coroutine.h"
+#include "iov.h"
 
 int coroutine_fn qemu_co_recvv(int sockfd, struct iovec *iov,
                                int len, int iov_offset)
@@ -32,7 +33,7 @@ int coroutine_fn qemu_co_recvv(int sockfd, struct iovec *iov,
     int total = 0;
     int ret;
     while (len) {
-        ret = qemu_recvv(sockfd, iov, len, iov_offset + total);
+        ret = iov_recv(sockfd, iov, iov_offset + total, len);
         if (ret < 0) {
             if (errno == EAGAIN) {
                 qemu_coroutine_yield();
@@ -58,7 +59,7 @@ int coroutine_fn qemu_co_sendv(int sockfd, struct iovec *iov,
     int total = 0;
     int ret;
     while (len) {
-        ret = qemu_sendv(sockfd, iov, len, iov_offset + total);
+        ret = iov_send(sockfd, iov, iov_offset + total, len);
         if (ret < 0) {
             if (errno == EAGAIN) {
                 qemu_coroutine_yield();