[PATCH v3 3/9] net: introduce tcp_client_start()

[Amos Kong <akong@xxxxxxxxxx>]

Introduce tcp_client_start() by moving original code in
tcp_start_outgoing_migration().

Signed-off-by: Amos Kong <akong@xxxxxxxxxx>
---
 net.c         |   41 +++++++++++++++++++++++++++++++++++++++++
 qemu_socket.h |    1 +
 2 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/net.c b/net.c
index e90ff23..9afb0d1 100644
--- a/net.c
+++ b/net.c
@@ -127,6 +127,47 @@ int tcp_server_start(const char *str, int *fd)
     return ret;
 }
 
+int tcp_client_start(const char *str, int *fd)
+{
+    struct sockaddr_in saddr;
+    int ret;
+
+    *fd = -1;
+    if (parse_host_port(&saddr, str) < 0) {
+        error_report("invalid host/port combination: %s", str);
+        return -EINVAL;
+    }
+
+    *fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
+    if (fd < 0) {
+        perror("socket");
+        return -1;
+    }
+    socket_set_nonblock(*fd);
+
+    for (;;) {
+        ret = connect(*fd, (struct sockaddr *)&saddr, sizeof(saddr));
+        if (ret < 0) {
+            ret = -socket_error();
+            if (ret == -EINPROGRESS) {
+                break;
+#ifdef _WIN32
+            } else if (ret == -WSAEALREADY || ret == -WSAEINVAL) {
+                break;
+#endif
+            } else if (ret != -EINTR && ret != -EWOULDBLOCK) {
+                perror("connect");
+                closesocket(*fd);
+                return ret;
+            }
+        } else {
+            break;
+        }
+    }
+
+    return ret;
+}
+
 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 {
     char buf[512];
diff --git a/qemu_socket.h b/qemu_socket.h
index d612793..9246578 100644
--- a/qemu_socket.h
+++ b/qemu_socket.h
@@ -55,6 +55,7 @@ int unix_connect_opts(QemuOpts *opts);
 int unix_connect(const char *path);
 
 int tcp_server_start(const char *str, int *fd);
+int tcp_client_start(const char *str, int *fd);
 
 /* Old, ipv4 only bits.  Don't use for new code. */
 int parse_host_port(struct sockaddr_in *saddr, const char *str);

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