Add chp3-FileIO

apue.h

@@ -1,5 +1,5 @@
 /* Our own header, to be included before all standard system headers */
-#include "error.c" 
+
 #ifndef _APUE_H
 #define _APUE_H
 
@@ -22,7 +22,7 @@
 #include <string.h> /* for convenience */
 #include <unistd.h> /* for convenience */
 #include <signal.h> /* for SIG_ERR */
-
+#include "error.c" 
 #define MAXLINE 4096 /* max line length */
 
 /*

chp3-FileIO/seekFile.c

@@ -0,0 +1,16 @@
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int main()
+{
+    if (lseek(STDIN_FILENO, 0, SEEK_CUR) == -1)
+        printf("Can not seek\n");
+    else
+    {
+        printf("Seek ok\n");
+    }
+
+    exit(0);
+
+}