From ba78f8b327493da43075dc00c946099990ef3f68 Mon Sep 17 00:00:00 2001
From: Mark McGranaghan <mmcgrana@gmail.com>
Date: Wed, 3 Oct 2012 09:55:25 -0700
Subject: [PATCH] exit work

---
 src/028-interfaces/interfaces.go |  2 ++
 src/073-exit/.gitignore          |  1 +
 src/073-exit/exit.go             | 18 +++++++++++++-----
 src/073-exit/exit.sh             |  2 ++
 4 files changed, 18 insertions(+), 5 deletions(-)
 create mode 100644 src/073-exit/.gitignore

diff --git a/src/028-interfaces/interfaces.go b/src/028-interfaces/interfaces.go
index 590b986..3702d28 100644
--- a/src/028-interfaces/interfaces.go
+++ b/src/028-interfaces/interfaces.go
@@ -7,3 +7,5 @@ import "fmt"
 type Shape interface {
     area() float64
 }
+
+// todo: that great blog post on interfaces
diff --git a/src/073-exit/.gitignore b/src/073-exit/.gitignore
new file mode 100644
index 0000000..a3abe50
--- /dev/null
+++ b/src/073-exit/.gitignore
@@ -0,0 +1 @@
+exit
diff --git a/src/073-exit/exit.go b/src/073-exit/exit.go
index ad4c531..19e070d 100644
--- a/src/073-exit/exit.go
+++ b/src/073-exit/exit.go
@@ -1,16 +1,24 @@
-// Exit
-
-package main
+// ## Exit
 
 // Use `os.Exit` to immediatly exit with a given
 // status.
+
+package main
+
 import "os"
 
 func main() {
-    // This `println` will never be reached because the
-    // exit is immediate.
+    // `defer`s will _not_ be run when using `os.Exit`, so
+    // this `println` will never be called.
     defer println("!")
+
+    // Exit with status 3.
     os.Exit(3)
 }
 
+// Note that unlike e.g. C, Go does not use an integer
+// return value from `main` to indicate exit status. If
+// you'd like to exit with a non-zero status you should
+// use `os.Exit`.
+
 // todo: discuss building before getting here
diff --git a/src/073-exit/exit.sh b/src/073-exit/exit.sh
index c3539ba..6418d11 100644
--- a/src/073-exit/exit.sh
+++ b/src/073-exit/exit.sh
@@ -9,3 +9,5 @@ $ go build exit.go
 $ ./exit
 $ echo $?
 3
+
+# Note that the `!` from our program never got printed.