[libvirt] [PATCH v3 03/11] util: netlink: use VIR_AUTOFREE instead of VIR_FREE for scalar types

[Erik Skultety]

On Thu, Aug 09, 2018 at 09:42:11AM +0530, Sukrit Bhatnagar wrote:
> By making use of GNU C's cleanup attribute handled by the
> VIR_AUTOFREE macro for declaring scalar variables, majority
> of the VIR_FREE calls can be dropped, which in turn leads to
> getting rid of most of our cleanup sections.
>
> Signed-off-by: Sukrit Bhatnagar <skrtbhtngr at gmail.com>
> ---
>  src/util/virnetlink.c | 43 ++++++++++++++++++++-----------------------
>  1 file changed, 20 insertions(+), 23 deletions(-)
>

Actually, I squashed the following into this patch:

diff --git a/src/util/virnetlink.c b/src/util/virnetlink.c
index ecf62c9e72..cb8072ff94 100644
--- a/src/util/virnetlink.c
+++ b/src/util/virnetlink.c
@@ -297,13 +297,13 @@ int virNetlinkCommand(struct nl_msg *nl_msg,
                       uint32_t src_pid, uint32_t dst_pid,
                       unsigned int protocol, unsigned int groups)
 {
-    int ret = -1;
     struct sockaddr_nl nladdr = {
             .nl_family = AF_NETLINK,
             .nl_pid    = dst_pid,
             .nl_groups = 0,
     };
     struct pollfd fds[1];
+    VIR_AUTOFREE(struct nlmsghdr *) temp_resp = NULL;
     VIR_AUTOPTR(virNetlinkHandle) nlhandle = NULL;
     int len = 0;

@@ -311,28 +311,22 @@ int virNetlinkCommand(struct nl_msg *nl_msg,

     if (!(nlhandle = virNetlinkSendRequest(nl_msg, src_pid, nladdr,
                                            protocol, groups)))
-        goto cleanup;
+        return -1;

-    len = nl_recv(nlhandle, &nladdr, (unsigned char **)resp, NULL);
+    len = nl_recv(nlhandle, &nladdr, (unsigned char **)&temp_resp, NULL);
     if (len == 0) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                        _("nl_recv failed - returned 0 bytes"));
-        goto cleanup;
+        return -1;
     }
     if (len < 0) {
         virReportSystemError(errno, "%s", _("nl_recv failed"));
-        goto cleanup;
+        return -1;
     }

-    ret = 0;
+    VIR_STEAL_PTR(*resp, temp_resp);
     *respbuflen = len;
- cleanup:
-    if (ret < 0) {
-        *resp = NULL;
-        *respbuflen = 0;
-    }
-
-    return ret;
+    return 0;
 }

 Erik