Start hw1

1 files changed, 28 insertions, 0 deletions

diff --git a/csci5271/hw1/hw1p2b.c b/csci5271/hw1/hw1p2b.c
new file mode 100644
index 0000000..df5ac73
--- /dev/null
+++ b/csci5271/hw1/hw1p2b.c
@@ -0,0 +1,28 @@
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+void silly_function(char *pathname) {
+  struct stat f, we;
+  int rfd, wfd;
+  char *buf;
+  stat(pathname, &f);
+  stat("./critical", &we);
+  if (f.st_dev == we.st_dev && f.st_ino == we.st_ino) {
+    return;
+  }
+  rfd = open(pathname, O_RDONLY);
+  buf = malloc(f.st_size - 1);
+  read(rfd, buf, f.st_size - 1);
+  close(rfd);
+  stat(pathname, &f);
+  if (f.st_dev == we.st_dev && f.st_ino == we.st_ino) {
+    return;
+  }
+  wfd = open(pathname, O_WRONLY | O_TRUNC);
+  write(wfd, buf, f.st_size - 1);
+  close(wfd);
+  free(buf);
+}
+
+int main() { silly_function("./not"); }
\ No newline at end of file