From 499688a5cda66f1dee5f5296bf91930da5f48ee9 Mon Sep 17 00:00:00 2001
From: "Michael D. Lowis" <mike.lowis@gentex.com>
Date: Wed, 5 Jul 2017 13:49:37 -0400
Subject: [PATCH] updated die function to print the error string when requested

---
 lib/utils.c | 6 ++++--
 pty.c       | 3 ++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/lib/utils.c b/lib/utils.c
index c9228dd..8608da7 100644
--- a/lib/utils.c
+++ b/lib/utils.c
@@ -66,10 +66,12 @@ uint64_t getmillis(void) {
 void die(const char* msgfmt, ...) {
     va_list args;
     va_start(args, msgfmt);
-    fprintf(stderr, "Error: ");
+    fprintf(stderr, "error: ");
     vfprintf(stderr, msgfmt, args);
-    fprintf(stderr, "\n");
     va_end(args);
+    if (*msgfmt && msgfmt[strlen(msgfmt)-1] == ':')
+        fprintf(stderr, " %s", strerror(errno));
+    fprintf(stderr, "\n");
     exit(EXIT_FAILURE);
 }
 
diff --git a/pty.c b/pty.c
index 06562ad..1a7d907 100644
--- a/pty.c
+++ b/pty.c
@@ -25,7 +25,8 @@ int pty_spawn(char** argv) {
             break;
 
         case 0: // Child Process
-            execvp(argv[0], argv);
+            if (execvp(argv[0], argv) < 0)
+                die("execvp('%s', ...) :", argv[0]);
             exit(EXIT_FAILURE);
             break;
 
-- 
2.49.0