[PATCH v3 1/9] net: introduce tcp_server_start()

[Amos Kong <akong@xxxxxxxxxx>]

Introduce tcp_server_start() by moving original code in
tcp_start_incoming_migration().

Signed-off-by: Amos Kong <akong@xxxxxxxxxx>
---
 net.c         |   28 ++++++++++++++++++++++++++++
 qemu_socket.h |    2 ++
 2 files changed, 30 insertions(+), 0 deletions(-)

diff --git a/net.c b/net.c
index c34474f..e90ff23 100644
--- a/net.c
+++ b/net.c
@@ -99,6 +99,34 @@ static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
     return 0;
 }
 
+int tcp_server_start(const char *str, int *fd)
+{
+    int val, ret;
+    struct sockaddr_in saddr;
+
+    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);
+
+    /* allow fast reuse */
+    val = 1;
+    setsockopt(*fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
+
+    ret = bind(*fd, (struct sockaddr *)&saddr, sizeof(saddr));
+    if (ret < 0) {
+        closesocket(*fd);
+    }
+    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 fe4cf6c..d612793 100644
--- a/qemu_socket.h
+++ b/qemu_socket.h
@@ -54,6 +54,8 @@ int unix_listen(const char *path, char *ostr, int olen);
 int unix_connect_opts(QemuOpts *opts);
 int unix_connect(const char *path);
 
+int tcp_server_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);
 int socket_init(void);

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