Some basic ls(1) error checking

1 files changed, 9 insertions, 1 deletions

diff --git a/ls.c b/ls.c
index 4b48c9c..251d5fb 100644
--- a/ls.c
+++ b/ls.c
@@ -1,4 +1,5 @@
 #include <dirent.h>
+#include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>
@@ -15,11 +16,18 @@ int main(int argc, char **argv)
         dirname = ".";
     }
 
-    dir = opendir(dirname);
+    if ((dir = opendir(dirname)) == NULL) {
+        perror("opendir");
+        exit(EXIT_FAILURE);
+    }
 
     while ((dirent = readdir(dir)) != NULL) {
         fprintf(stdout, "%s\n", dirent->d_name);
     }
+    if (errno) {
+        perror("readdir");
+        exit(EXIT_FAILURE);
+    }
 
     exit(EXIT_SUCCESS);
 }