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-rw-r--r--socket/sys/socket.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/socket/sys/socket.h b/socket/sys/socket.h
index 7ccb7dd8d0..3ff4fc5fa2 100644
--- a/socket/sys/socket.h
+++ b/socket/sys/socket.h
@@ -199,6 +199,12 @@ extern int accept (int __fd, __SOCKADDR_ARG __addr,
 extern int shutdown (int __fd, int __how) __THROW;
 
 
+#ifdef __USE_XOPEN2K
+/* Determine wheter socket is at a out-of-band mark.  */
+extern int sockatmark (int __fd) __THROW;
+#endif
+
+
 #ifdef __USE_MISC
 /* FDTYPE is S_IFSOCK or another S_IF* macro defined in <sys/stat.h>;
    returns 1 if FD is open on an object of the indicated type, 0 if not,