#ifndef REGTEST
-/* TODO: Initialize stdin, stdout, stderr */
+/* In a POSIX system, stdin / stdout / stderr are equivalent to the (int) file
+ descriptors 0, 1, and 2 respectively.
+*/
+/* TODO: This is proof-of-concept, requires finetuning. */
+static struct _PDCLIB_file_t _PDCLIB_sin = { 0, { 0, 0 }, 0, 0, 0, /* mbstate, */ 0 };
+static struct _PDCLIB_file_t _PDCLIB_sout = { 1, { 0, 0 }, 0, 0, 0, /* mbstate, */ 0 };
+static struct _PDCLIB_file_t _PDCLIB_serr = { 2, { 0, 0 }, 0, 0, 0, /* mbstate, */ 0 };
+
+struct _PDCLIB_file_t * stdin = &_PDCLIB_sin;
+struct _PDCLIB_file_t * stdout = &_PDCLIB_sout;
+struct _PDCLIB_file_t * stderr = &_PDCLIB_serr;
#endif