1 files changed, 76 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/oldsendmmsg.c b/sysdeps/unix/sysv/linux/oldsendmmsg.c
new file mode 100644
index 0000000..e40c311
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/oldsendmmsg.c
@@ -0,0 +1,76 @@
+/* Compatibility implementation of sendmmsg.
+   Copyright (C) 2016 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sys/socket.h>
+#include <sysdep-cancel.h>
+#include <socketcall.h>
+#include <shlib-compat.h>
+
+#if __WORDSIZE == 64
+# if SHLIB_COMPAT (libc, GLIBC_2_14, GLIBC_2_24)
+
+int
+__old_sendmmsg (int fd, struct mmsghdr *vmessages, unsigned int vlen,
+		int flags)
+{
+#  ifdef __NR_sendmmsg
+  return SYSCALL_CANCEL (sendmmsg, fd, vmessages, vlen, flags);
+#  elif defined __NR_socketcall
+#   ifdef __ASSUME_SENDMMSG_SOCKETCALL
+  return SOCKETCALL_CANCEL (sendmmsg, fd, vmessages, vlen, flags);
+#   else
+  static int have_sendmmsg;
+  if (__glibc_likely (have_sendmmsg >= 0))
+    {
+      int ret = SOCKETCALL_CANCEL (sendmmsg, fd, vmessages, vlen, flags);
+      /* The kernel returns -EINVAL for unknown socket operations.
+	 We need to convert that error to an ENOSYS error.  */
+      if (__builtin_expect (ret < 0, 0)
+	  && have_sendmmsg == 0
+	  && errno == EINVAL)
+	{
+	  /* Try another call, this time with an invalid file
+	     descriptor and all other parameters cleared.  This call
+	     will not cause any harm and it will return
+	     immediately.  */
+	  ret = SOCKETCALL_CANCEL (invalid, -1);
+	  if (errno == EINVAL)
+	    {
+	      have_sendmmsg = -1;
+	      __set_errno (ENOSYS);
+	    }
+	  else
+	    {
+	      have_sendmmsg = 1;
+	      __set_errno (EINVAL);
+	    }
+	  return -1;
+	}
+      return ret;
+    }
+  __set_errno (ENOSYS);
+  return -1;
+#   endif /* __ASSUME_SENDMMSG_SOCKETCALL  */
+#  else /* defined __NR_socketcall  */
+  __set_errno (ENOSYS);
+  return -1;
+#  endif
+}
+compat_symbol (libc, __old_sendmmsg, sendmmsg, GLIBC_2_14);
+# endif /* SHLIB_COMPAT (libc, GLIBC_2_14, GLIBC_2_24)  */
+#endif /* __WORDSIZE == 64  */