Avoid changing directory in `mruby-io` test

mrbgems/mruby-io/test/mruby_io_test.c

@@ -67,36 +67,6 @@ mkdtemp(char *temp)
 #include "mruby/variable.h"
 #include <mruby/ext/io.h>
 
-int wd_save;
-int socket_available_p;
-
-#if !defined(_WIN32) && !defined(_WIN64)
-static int mrb_io_socket_available()
-{
-  int fd, retval = 0;
-  struct sockaddr_un sun0;
-  char socketname[] = "tmp.mruby-io-socket-ok.XXXXXXXX";
-  if (!(fd = mkstemp(socketname))) {
-    goto sock_test_out;
-  }
-  unlink(socketname);
-  close(fd);
-  fd = socket(AF_UNIX, SOCK_STREAM, 0);
-  if (fd == -1) {
-    goto sock_test_out;
-  }
-  sun0.sun_family = AF_UNIX;
-  strncpy(sun0.sun_path, socketname, sizeof(sun0.sun_path));
-  if (bind(fd, (struct sockaddr *)&sun0, sizeof(sun0)) == 0) {
-    retval = 1;
-  }
-sock_test_out:
-  unlink(socketname);
-  close(fd);
-  return retval;
-}
-#endif
-
 static mrb_value
 mrb_io_test_io_setup(mrb_state *mrb, mrb_value self)
 {
@@ -111,14 +81,6 @@ mrb_io_test_io_setup(mrb_state *mrb, mrb_value self)
   int i;
 #if !defined(_WIN32) && !defined(_WIN64)
   struct sockaddr_un sun0;
-
-  if(!(socket_available_p = mrb_io_socket_available())) {
-    char *tmpdir;
-    wd_save = open(".", O_DIRECTORY);
-    tmpdir = getenv("TMPDIR");
-    if (tmpdir) chdir(tmpdir);
-    else chdir("/tmp");
-  }
 #endif
 
   mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_msg"), mrb_str_new_cstr(mrb, msg));
@@ -219,13 +181,6 @@ mrb_io_test_io_cleanup(mrb_state *mrb, mrb_value self)
   mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_socketname"), mrb_nil_value());
   mrb_gv_set(mrb, mrb_intern_cstr(mrb, "$mrbtest_io_msg"), mrb_nil_value());
 
-#if !defined(_WIN32) && !defined(_WIN64)
-  if(!socket_available_p) {
-    fchdir(wd_save);
-    close(wd_save);
-  }
-#endif
-
   return mrb_nil_value();
 }