From 37a8bebd1bae626657634b193166d0d5a2a9b685 Mon Sep 17 00:00:00 2001
From: Ali Mashtizadeh <mashti@cs.stanford.edu>
Date: Fri, 16 Jan 2015 14:51:03 -0800
Subject: [PATCH] Expose POSIX sleep

---
 include/unistd.h    |  1 +
 lib/libc/SConscript |  5 +++--
 lib/libc/process.c  | 15 +++++++++++++++
 3 files changed, 19 insertions(+), 2 deletions(-)
 create mode 100644 lib/libc/process.c

diff --git a/include/unistd.h b/include/unistd.h
index 37c2a54..4782b53 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -7,6 +7,7 @@
 #define STDERR_FILENO		2
 
 int syscall(int number, ...);
+unsigned int sleep(unsigned int seconds);
 
 #endif /* __UNISTD_H__ */
 
diff --git a/lib/libc/SConscript b/lib/libc/SConscript
index 473c13e..4d44201 100644
--- a/lib/libc/SConscript
+++ b/lib/libc/SConscript
@@ -13,11 +13,12 @@ src_common = [
     "exit.c",
     "file.c",
     "malloc.c",
+    "printf.c",
+    "process.c",
+    "posix/mman.c",
     "string.c",
     "syscall.c",
     "time.c",
-    "printf.c",
-    "posix/mman.c",
 ]
 
 src_amd64 = [
diff --git a/lib/libc/process.c b/lib/libc/process.c
new file mode 100644
index 0000000..67b1f14
--- /dev/null
+++ b/lib/libc/process.c
@@ -0,0 +1,15 @@
+
+#include <stdint.h>
+
+#include <unistd.h>
+#include <syscall.h>
+
+unsigned int
+sleep(unsigned int seconds)
+{
+    OSThreadSleep(seconds);
+
+    // Should return left over time if woke up early
+    return 0;
+}
+