From edf846f58e7c24516d1450460ae91623563c6c62 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20=C4=8Cert=C3=ADk?= <ondrej@certik.us>
Date: Tue, 29 Mar 2022 20:28:40 -0600
Subject: [PATCH 1/2] CI: Enable failing on error

This was introduced when we split the CI script into two, the second one
does not fail on error.
---
 ci/test.xsh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ci/test.xsh b/ci/test.xsh
index 79f5dbf356..790318a3f7 100644
--- a/ci/test.xsh
+++ b/ci/test.xsh
@@ -1,3 +1,8 @@
+#!/usr/bin/env xonsh
+#
+$RAISE_SUBPROC_ERROR = True
+trace on
+
 # Run some simple compilation tests, works everywhere:
 src/bin/lpython --version
 # Compile and link separately

From d427bc4a7303db072604761c40c6fec2c0cea0af Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20=C4=8Cert=C3=ADk?= <ondrej@certik.us>
Date: Tue, 29 Mar 2022 21:06:13 -0600
Subject: [PATCH 2/2] Make os.open API exactly as in CPython

---
 integration_tests/test_os.py |  4 ++--
 src/runtime/os.py            | 16 ++++++++++++++--
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/integration_tests/test_os.py b/integration_tests/test_os.py
index fea7230893..664d5fea0a 100644
--- a/integration_tests/test_os.py
+++ b/integration_tests/test_os.py
@@ -1,12 +1,12 @@
 from ltypes import i64
-from os import (open, read, close)
+from os import (open, read, close, O_RDONLY)
 
 def test():
     path: str 
     path = "integration_tests/test_os.py"
     fd: i64
     n: i64
-    fd = open(path, "r")
+    fd = open(path, O_RDONLY)
     n = 100
     print(read(fd, n))
     close(fd) 
diff --git a/src/runtime/os.py b/src/runtime/os.py
index 8d1050e3f9..9b4e2eb8b4 100644
--- a/src/runtime/os.py
+++ b/src/runtime/os.py
@@ -1,10 +1,22 @@
 from ltypes import i32, i64, ccall
 
-def open(path: str, flag: str) -> i64:
+O_RDONLY: i32 # = 0 FIXME: Assign the value 0 to O_RDONLY
+# O_WRONLY: i32 = 1
+# O_RDWR  : i32 = 2
+# O_CREAT : i32 = 64
+# O_APPEND: i32 = 1024
+
+
+def open(path: str, flag: i32) -> i64:
     """
     Returns the file descriptor for the newly opened file
     """
-    return _lpython_open(path, flag)
+    sflag: str
+    if flag == O_RDONLY:
+        sflag = "r"
+    else:
+        quit(1) # not implemented yet
+    return _lpython_open(path, sflag)
 
 @ccall
 def _lpython_open(path: str, flag: str) -> i64: