1 files changed, 11 insertions, 5 deletions
diff --git a/userspace/cat.c b/userspace/cat.c
index 800a14b..39d994f 100644
--- a/userspace/cat.c
+++ b/userspace/cat.c
@@ -1,18 +1,24 @@
 #include <stdio.h>
 
-int main()
+int main(int argc, char **argv)
 {   
+    FILE *f;
+    if(argc>1)f=fopen(argv[1],"r");
+    else f=stdin;
+
+    setvbuf(stdin,NULL,_IONBF,0);
+    setvbuf(stdout,NULL,_IONBF,0);
 
     char c;
 
-    printf("-- read from stderr byte by byte --\n");
+    printf("-- read from file byte by byte --\n");
 
-    while(_poll(2)){
-	fread(&c,1,1,stderr);
+    while(fread(&c,1,1,f))
+    {
 	printf("%c",c);
     }
 
-    printf("\n-- no more data on stderr --\n");
+    printf("\n-- no more data on this file --\n");
 
     return 0;
 }