3 files changed, 21 insertions, 15 deletions
diff --git a/byterun/io.c b/byterun/io.c
index a261adbc9..f8f186e50 100644
--- a/byterun/io.c
+++ b/byterun/io.c
@@ -163,7 +163,7 @@ again:
       n = 1; goto again;
     }
   }
-  if (retcode == -1) caml_sys_error(NO_ARG);
+  if (retcode == -1) caml_sys_io_error(NO_ARG);
   return retcode;
 }
 
@@ -266,7 +266,7 @@ CAMLexport int caml_do_read(int fd, char *p, unsigned int n)
     retcode = read(fd, p, n);
     caml_leave_blocking_section();
   } while (retcode == -1 && errno == EINTR);
-  if (retcode == -1) caml_sys_error(NO_ARG);
+  if (retcode == -1) caml_sys_io_error(NO_ARG);
   return retcode;
 }
 
diff --git a/byterun/sys.c b/byterun/sys.c
index 9d3bedbbb..801b1303b 100644
--- a/byterun/sys.c
+++ b/byterun/sys.c
@@ -73,23 +73,28 @@ CAMLexport void caml_sys_error(value arg)
   char * err;
   CAMLlocal1 (str);
 
+  err = error_message();
+  if (arg == NO_ARG) {
+    str = caml_copy_string(err);
+  } else {
+    int err_len = strlen(err);
+    int arg_len = caml_string_length(arg);
+    str = caml_alloc_string(arg_len + 2 + err_len);
+    memmove(&Byte(str, 0), String_val(arg), arg_len);
+    memmove(&Byte(str, arg_len), ": ", 2);
+    memmove(&Byte(str, arg_len + 2), err, err_len);
+  }
+  caml_raise_sys_error(str);
+  CAMLnoreturn;
+}
+
+CAMLexport void caml_sys_io_error(value arg)
+{
   if (errno == EAGAIN || errno == EWOULDBLOCK) {
     caml_raise_sys_blocked_io();
   } else {
-    err = error_message();
-    if (arg == NO_ARG) {
-      str = caml_copy_string(err);
-    } else {
-      int err_len = strlen(err);
-      int arg_len = caml_string_length(arg);
-      str = caml_alloc_string(arg_len + 2 + err_len);
-      memmove(&Byte(str, 0), String_val(arg), arg_len);
-      memmove(&Byte(str, arg_len), ": ", 2);
-      memmove(&Byte(str, arg_len + 2), err, err_len);
-    }
-    caml_raise_sys_error(str);
+    caml_sys_error(arg);
   }
-  CAMLnoreturn;
 }
 
 CAMLprim value caml_sys_exit(value retcode)
diff --git a/byterun/sys.h b/byterun/sys.h
index ef2354275..4ad8011d9 100644
--- a/byterun/sys.h
+++ b/byterun/sys.h
@@ -21,6 +21,7 @@
 #define NO_ARG Val_int(0)
 
 CAMLextern void caml_sys_error (value);
+CAMLextern void caml_sys_io_error (value);
 extern void caml_sys_init (char * exe_name, char ** argv);
 CAMLextern value caml_sys_exit (value);