stdlib: add fileno (DONE)

CMakeLists.txt

@@ -112,6 +112,7 @@ set(SOURCES
   src/stdio/fgetc.c
   src/stdio/fgetpos.c
   src/stdio/fgets.c
+  src/stdio/fileno.c
   src/stdio/fileutil.c
   src/stdio/fopen.c
   src/stdio/fprintf.c

STATUS

@@ -99,6 +99,7 @@ TEST:       Function/symbol/macro needs to be tested
      7.19.5.4  freopen                       -
      7.19.5.5  setbuf                        -
      7.19.5.6  setvbuf                       -
+     (EXT)     fileno                        -
 
      7.19.6.1  fprintf                       -
      7.19.6.2  fscanf                        TODO

include/stdio.h

@@ -187,6 +187,7 @@ extern void setbuf(FILE * __restrict__ __fp, char * __restrict__ __buf);
 extern int setvbuf(FILE * __restrict__ __fp, char * __restrict__ __buf,
 	int __mode, size_t __size);
 
+/* Return the file descriptor associated with __fp. */
 extern int fileno(FILE *__fp);
 
 /*

src/stdio/fileno.c

@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+int fileno(FILE *fp)
+{
+	return fp->fd;
+}