Include flags as an argument for open function

Author: Thirumalai-Shaktivel

integration_tests/run_tests.py

@@ -20,7 +20,7 @@
     "test_numpy_01.py",
     "test_numpy_02.py",
     "test_random.py",
-    # "test_os.py",
+    "test_os.py",
     "test_builtin.py",
     "test_builtin_abs.py",
     "test_builtin_bool.py",

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)
+    fd = open(path, O_RDONLY)
     n = 100
     print(read(fd, n))
     close(fd) 

src/runtime/impure/lfortran_intrinsics.c

@@ -789,9 +789,9 @@ LFORTRAN_API void _lfortran_dp_rand_num(double *x) {
     *x = rand() / (double) RAND_MAX;
 }
 
-LFORTRAN_API int64_t _lpython_open(char *path)
+LFORTRAN_API int64_t _lpython_open(char *path, int32_t flags)
 {
-    int64_t fd = open(path, O_RDONLY);
+    int64_t fd = open(path, flags);
     if (fd < 0) 
     {
         printf("Error in opening the file!\n");

src/runtime/impure/lfortran_intrinsics.h

@@ -160,7 +160,7 @@ LFORTRAN_API void _lfortran_i64sys_clock(
         uint64_t *count, int64_t *rate, int64_t *max);
 LFORTRAN_API void _lfortran_sp_rand_num(float *x);
 LFORTRAN_API void _lfortran_dp_rand_num(double *x);
-LFORTRAN_API int64_t _lpython_open(char *path);
+LFORTRAN_API int64_t _lpython_open(char *path, int32_t flags);
 LFORTRAN_API char* _lpython_read(int64_t fd, int64_t n);
 LFORTRAN_API void _lpython_close(int64_t fd);
 

src/runtime/os.py

@@ -1,13 +1,19 @@
-from ltypes import i64, ccall
+from ltypes import i32, i64, ccall
 
-def open(path: 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)
+    return _lpython_open(path, flag)
 
 @ccall
-def _lpython_open(path: str) -> i64:
+def _lpython_open(path: str, flag: i32) -> i64:
     pass
 
 def read(fd: i64, n: i64) -> str: