Add operating system course design.

1 files changed, 25 insertions, 0 deletions

diff --git a/operating-system-course-design/read-file.c b/operating-system-course-design/read-file.c
new file mode 100644
index 0000000..fe71f94
--- /dev/null
+++ b/operating-system-course-design/read-file.c
@@ -0,0 +1,25 @@
+#include <bits/types.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <stdio.h>
+
+int main() {
+  int fd = open("/mnt/fat-test/big", O_RDONLY);
+  if (fd < 0)
+    return 1;
+
+  __off_t size = lseek(fd, 0, SEEK_END);
+  if (size < 0)
+    return 2;
+
+  for (__off_t i = 512; i <= size; i += 512) {
+    if (lseek(fd, size - i, SEEK_SET) < 0)
+      return 3;
+    char buffer[512];
+    if (read(fd, buffer, 512) < 0)
+      return 4;
+  }
+
+  return 0;
+}