1 files changed, 72 insertions, 0 deletions
diff --git a/libc/inet/bindresvport.c b/libc/inet/bindresvport.c
new file mode 100644
index 0000000..5d9ad2b
--- /dev/null
+++ b/libc/inet/bindresvport.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <string.h>
+#include <unistd.h>
+
+#define START_PORT	600
+#define END_PORT	IPPORT_RESERVED
+#define NUM_PORTS	(END_PORT - START_PORT)
+
+int bindresvport(int sd, struct sockaddr_in *sin)
+{
+    static short        port;
+    struct sockaddr_in  sin0;
+    int                 nn, ret;
+
+    if (sin == NULL) {
+        sin = &sin0;
+        memset( sin, 0, sizeof *sin );
+        sin->sin_family = AF_INET;
+    } else if (sin->sin_family != AF_INET) {
+        errno = EPFNOSUPPORT;
+        return -1;
+    }
+
+    if (port == 0) {
+        port = START_PORT + (getpid() % NUM_PORTS);
+    }
+
+    for (nn = NUM_PORTS; nn > 0; nn--, port++) 
+    {
+        if (port == END_PORT)
+            port = START_PORT;
+
+        sin->sin_port = htons(port);
+        do {
+            ret = bind(sd, (struct sockaddr*)sin, sizeof(*sin));
+        } while (ret < 0 && errno == EINTR);
+
+        if (!ret)
+            break;
+    }
+    return ret;
+}