[PATCH v3 5/9] net: refector tcp_*_start functions

[Amos Kong <akong@xxxxxxxxxx>]

There are some repeated code for tcp_server_start()
and tcp_client_start().

Signed-off-by: Amos Kong <akong@xxxxxxxxxx>
---
 net.c |   83 ++++++++++++++++++++++++++++++++++++-----------------------------
 1 files changed, 46 insertions(+), 37 deletions(-)

diff --git a/net.c b/net.c
index 9afb0d1..b05c881 100644
--- a/net.c
+++ b/net.c
@@ -99,38 +99,41 @@ 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)
+static int tcp_server_bind(int fd, struct sockaddr_in *saddr)
 {
-    int val, ret;
-    struct sockaddr_in saddr;
+    int ret;
+    int val = 1;
 
-    if (parse_host_port(&saddr, str) < 0) {
-        error_report("invalid host/port combination: %s", str);
-        return -EINVAL;
-    }
+    /* allow fast reuse */
+    setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
 
-    *fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
-    if (fd < 0) {
-        perror("socket");
-        return -1;
+    ret = bind(fd, (struct sockaddr *)saddr, sizeof(*saddr));
+
+    if (ret == -1) {
+        ret = -socket_error();
     }
-    socket_set_nonblock(*fd);
+    return ret;
 
-    /* allow fast reuse */
-    val = 1;
-    setsockopt(*fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
+}
+
+static int tcp_client_connect(int fd, struct sockaddr_in *saddr)
+{
+    int ret;
+
+    do {
+        ret = connect(fd, (struct sockaddr *)saddr, sizeof(*saddr));
+        if (ret == -1) {
+            ret = -socket_error();
+        }
+    } while (ret == -EINTR || ret == -EWOULDBLOCK);
 
-    ret = bind(*fd, (struct sockaddr *)&saddr, sizeof(saddr));
-    if (ret < 0) {
-        closesocket(*fd);
-    }
     return ret;
 }
 
-int tcp_client_start(const char *str, int *fd)
+static int tcp_start_common(const char *str, int *fd, bool server)
 {
+    int ret = -EINVAL;
     struct sockaddr_in saddr;
-    int ret;
 
     *fd = -1;
     if (parse_host_port(&saddr, str) < 0) {
@@ -145,29 +148,35 @@ int tcp_client_start(const char *str, int *fd)
     }
     socket_set_nonblock(*fd);
 
-    for (;;) {
-        ret = connect(*fd, (struct sockaddr *)&saddr, sizeof(saddr));
-        if (ret < 0) {
-            ret = -socket_error();
-            if (ret == -EINPROGRESS) {
-                break;
+    if (server) {
+        ret = tcp_server_bind(*fd, &saddr);
+    } else {
+        ret = tcp_client_connect(*fd, &saddr);
+    }
+
 #ifdef _WIN32
-            } else if (ret == -WSAEALREADY || ret == -WSAEINVAL) {
-                break;
+    if (ret == -WSAEALREADY || ret == -WSAEINVAL) {
+        return ret;                  /* Success */
+    }
 #endif
-            } else if (ret != -EINTR && ret != -EWOULDBLOCK) {
-                perror("connect");
-                closesocket(*fd);
-                return ret;
-            }
-        } else {
-            break;
-        }
+    if (ret >= 0 || ret == -EINPROGRESS || ret == -EWOULDBLOCK) {
+        return ret;                  /* Success */
     }
 
+    closesocket(*fd);
     return ret;
 }
 
+int tcp_server_start(const char *str, int *fd)
+{
+    return tcp_start_common(str, fd, true);
+}
+
+int tcp_client_start(const char *str, int *fd)
+{
+    return tcp_start_common(str, fd, false);
+}
+
 int parse_host_port(struct sockaddr_in *saddr, const char *str)
 {
     char buf[512];

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