1 files changed, 28 insertions, 0 deletions
diff --git a/include/unistd.h b/include/unistd.h
new file mode 100644
index 0000000..c63ac6a
--- /dev/null
+++ b/include/unistd.h
@@ -0,0 +1,28 @@
+#ifndef _UNISTD_H
+#define _UNISTD_H
+
+#define __SYS_print 0
+
+#define _syscall0(type, name) \
+  type name(void) { \
+    type __res; \
+    __asm__ volatile ( \
+        "int $0x80" \
+        : "=a" (__res) \
+        : "a" (__SYS_##name) \
+        :); \
+    return __res; \
+  }
+
+#define _syscall1(type, name, atype, a) \
+  type name(atype a) { \
+    type __res; \
+    __asm__ volatile ( \
+        "int $0x80" \
+        : "=a" (__res) \
+        : "a" (__SYS_##name), "b" (a) \
+        :); \
+    return __res; \
+  }
+
+#endif