diff --git a/buildtest.c b/buildtest.c
index fcbc330..3ae2429 100644
--- a/buildtest.c
+++ b/buildtest.c
@@ -28,9 +28,14 @@ int main() {
   // Test the read syscall
   #define INPUT_BUFFER_LEN 4096
   char input_buffer[INPUT_BUFFER_LEN] = {0};
+  int32_t fout = openc("outfile", O_RDWR | O_CREAT | O_TRUNC, 0664);
+
   write(STDOUT, "Enter some text:", 16);
   intptr_t n_read = read(STDIN, input_buffer, INPUT_BUFFER_LEN);
   write(STDOUT, input_buffer, n_read);
+  if(fout > 0) {
+    write(fout, input_buffer, n_read);
+  }
 
   // Test the open syscall
   int32_t file = open("/proc/version", O_RDONLY);
diff --git a/sys.h b/sys.h
index 3bdefff..2bce1db 100644
--- a/sys.h
+++ b/sys.h
@@ -13,11 +13,25 @@ intptr_t read(int32_t fd, const void* buf, intptr_t size);
 #define O_WRONLY       01
 #define O_RDWR         02
 #define AT_FDCWD      -100
+
+#if defined(__mips__)
+  // linux/arch/mips/include/uapi/asm/fcntl.h
+  #define O_APPEND	0x0008
+  #define O_CREAT		0x0100	/* not fcntl */
+  #define O_TRUNC		0x0200	/* not fcntl */
+  #define O_EXCL		0x0400	/* not fcntl */
+  #define O_NOCTTY	0x0800	/* not fcntl */
+#else
+  // linux/include/uapi/asm-generic/fcntl.h
+  #define O_CREAT        1<<6
+  #define O_EXCL         1<<7
+  #define O_NOCTTY       1<<8
+  #define O_TRUNC        1<<9
+  #define O_APPEND       1<<10
+#endif 
 int32_t openat(int32_t fd, const char* filename, uint32_t flags, uint32_t mode);
 #define open(...) openat(AT_FDCWD, __VA_ARGS__, 0)
-//inline int32_t openat(int32_t fd, const char* filename, uint32_t flags) {return openat(fd, filename, flags, 0);}
-//inline int32_t open(const char* filename, uint32_t flags, uint32_t mode) {return openat(AT_FDCWD, filename, flags, mode);}
-//inline int32_t open(const char* filename, uint32_t flags) {return openat(AT_FDCWD, filename, flags, 0);}
+#define openc(...) openat(AT_FDCWD, __VA_ARGS__)
 
 uint32_t fork();