1 files changed, 15 insertions, 0 deletions
diff --git a/include/unistd.h b/include/unistd.h
index 47e1621..0b3c666 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -8,6 +8,10 @@
 typedef int32_t ssize_t;
 #endif
 
+#define STDIN_FILENO    0
+#define STDOUT_FILENO   1
+#define STDERR_FILENO   2
+
 typedef int16_t pid_t;
 
 #define __SYS_alarm     0
@@ -55,6 +59,17 @@ typedef int16_t pid_t;
     return __res; \
   }
 
+#define _syscall3(type, name, atype, a, btype, b, ctype, c) \
+  type name(atype a, btype b, ctype c) { \
+    type __res; \
+    __asm__ volatile ( \
+        "int $0x80" \
+        : "=a" (__res) \
+        : "a" (__SYS_##name), "b" (a), "c" (b), "d" (c) \
+        ); \
+    return __res; \
+  }
+
 pid_t getpid(void);
 void *getpdir(void);