2.5-18.1

socket/opensock.c

@@ -0,0 +1,71 @@
+/* Copyright (C) 1999 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <stdio.h>
+#include <sys/socket.h>
+#include <bits/libc-lock.h>
+
+/* Return a socket of any type.  The socket can be used in subsequent
+   ioctl calls to talk to the kernel.  */
+int internal_function
+__opensock (void)
+{
+  /* Cache the last AF that worked, to avoid many redundant calls to
+     socket().  */
+  static int sock_af = -1;
+  int fd = -1;
+  __libc_lock_define_initialized (static, lock);
+
+  if (sock_af != -1)
+    {
+      fd = __socket (sock_af, SOCK_DGRAM, 0);
+      if (fd != -1)
+        return fd;
+    }
+
+  __libc_lock_lock (lock);
+
+  if (sock_af != -1)
+    fd = __socket (sock_af, SOCK_DGRAM, 0);
+
+  if (fd == -1)
+    {
+#ifdef AF_INET
+      fd = __socket (sock_af = AF_INET, SOCK_DGRAM, 0);
+#endif
+#ifdef AF_INET6
+      if (fd < 0)
+	fd = __socket (sock_af = AF_INET6, SOCK_DGRAM, 0);
+#endif
+#ifdef AF_IPX
+      if (fd < 0)
+	fd = __socket (sock_af = AF_IPX, SOCK_DGRAM, 0);
+#endif
+#ifdef AF_AX25
+      if (fd < 0)
+	fd = __socket (sock_af = AF_AX25, SOCK_DGRAM, 0);
+#endif
+#ifdef AF_APPLETALK
+      if (fd < 0)
+	fd = __socket (sock_af = AF_APPLETALK, SOCK_DGRAM, 0);
+#endif
+    }
+
+  __libc_lock_unlock (lock);
+  return fd;
+}