chdir getcwd

4.8.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int main()
+{
+    if (chdir("/tmp") < 0) {
+        printf("chdir failed!\n");
+        exit(-1);
+    }
+
+    printf("chidr to /tmp successed\n");
+
+    return 0;
+}

4.9.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int main()
+{
+    char    *ptr;
+    int     size = 100;
+
+    if (chdir("/home/vagrant") < 0) {
+        printf("chdir failed\n");
+    }
+
+    if (getcwd(ptr, size) == NULL) {
+        printf("getcwd failed\n");
+    }
+
+    printf("cwd = %s\n", ptr);
+
+    return 0;
+}