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-rw-r--r--include/unistd.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/unistd.h b/include/unistd.h
index aa8e1e651..787f9e52d 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -563,6 +563,12 @@ extern int dup (int __fd) __THROW __wur;
extern int dup2 (int __fd, int __fd2) __THROW;
libc_hidden_proto(dup2)
+#ifdef __USE_GNU
+/* Duplicate FD to FD2, closing FD2 and making it open on the same
+ file while setting flags according to FLAGS. */
+extern int dup3 (int __fd, int __fd2, int __flags) __THROW;
+#endif
+
/* NULL-terminated array of "NAME=VALUE" environment variables. */
extern char **__environ;
#ifdef __USE_GNU