[PATCH] qemu-sockets: add abstract UNIX domain socket support

[xiaoqiang zhao]

unix_connect_saddr now support abstract address type

By default qemu does not support abstract UNIX domain
socket address. Add this ability to make qemu handy
when abstract address is needed.
Abstract address is marked by prefixing the address name with a '@'.

Signed-off-by: xiaoqiang zhao <address@hidden>
---
 util/qemu-sockets.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
index bcc06d0e01..d4f02a6b1a 100644
--- a/util/qemu-sockets.c
+++ b/util/qemu-sockets.c
@@ -939,6 +939,7 @@ static int unix_connect_saddr(UnixSocketAddress *saddr, 
Error **errp)
     struct sockaddr_un un;
     int sock, rc;
     size_t pathlen;
+    socklen_t serverlen;
 
     if (saddr->path == NULL) {
         error_setg(errp, "unix connect: no path specified");
@@ -963,10 +964,18 @@ static int unix_connect_saddr(UnixSocketAddress *saddr, 
Error **errp)
     un.sun_family = AF_UNIX;
     memcpy(un.sun_path, saddr->path, pathlen);
 
+    if (saddr->path[0] == '@') {
+        un.sun_path[0] = '\0';
+        serverlen = strlen(saddr->path) + offsetof(struct sockaddr_un, 
sun_path);
+    }
+    else {
+        serverlen = sizeof(un);
+    }
+
     /* connect to peer */
     do {
         rc = 0;
-        if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) {
+        if (connect(sock, (struct sockaddr *) &un, serverlen) < 0) {
             rc = -errno;
         }
     } while (rc == -EINTR);
-- 
2.17.1