fstat

primitive ls

ls.c

@@ -0,0 +1,43 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+#include "fs.h"
+
+char buf[512];
+struct stat stat;
+struct dirent dirent;
+
+int
+main(int argc, char *argv[])
+{
+  int fd;
+  uint off;
+
+  if(argc > 1){
+    puts("Usage: ls\n");
+    exit();
+  }
+
+  fd = open(".", 0);
+  if(fd < 0){
+    printf(2, "ls: cannot open .\n");
+    exit();
+  }
+  if (fstat(fd, &stat) < 0) {
+    printf(2, "ls: cannot open .\n");
+    exit();
+  }
+  if (stat.st_type != T_DIR) {
+    printf(2, "ls: . is not a dir\n");
+  }
+  for(off = 0; off < stat.st_size; off += sizeof(struct dirent)) {
+    if (read(fd, &dirent, sizeof(struct dirent)) != sizeof(struct dirent)) {
+      printf(2, "ls: read error\n");
+      exit();
+    }
+    printf(1, "%s\n", dirent.name);
+  }
+  close(fd);
+
+  exit();
+}