Refactor libc stubs into libwrap

The --wrap feature of GNU ld supports a cleaner framework for linking in
alternative implementations of libc functions without cpp hacks.
Place wrappers in separate object files to reduce static code size.

1 files changed, 11 insertions, 0 deletions

diff --git a/bsp/libwrap/sys/isatty.c b/bsp/libwrap/sys/isatty.c
new file mode 100644
index 0000000..55eab0a
--- /dev/null
+++ b/bsp/libwrap/sys/isatty.c
@@ -0,0 +1,11 @@
+/* See LICENSE of license details. */
+
+#include <unistd.h>
+
+int __wrap_isatty(int fd)
+{
+  if (fd == STDOUT_FILENO || fd == STDERR_FILENO)
+    return 1;
+
+  return 0;
+}