diff --git a/test/osal-unix.cc b/test/osal-unix.cc
index 7625e0f4..ab63db89 100644
--- a/test/osal-unix.cc
+++ b/test/osal-unix.cc
@@ -272,3 +272,14 @@ void osal_udelay(unsigned us) {
 }
 
 bool osal_istty(int fd) { return isatty(fd) == 1; }
+
+std::string osal_tempdir(void) {
+  const char *tempdir = getenv("TEMPDIR");
+  if (!tempdir || *tempdir == '\0')
+    return (access("/dev/shm/", R_OK | W_OK | X_OK) == 0) ? "/dev/shm/" : "";
+
+  std::string dir(tempdir);
+  if (dir.at(dir.length() - 1) != '/')
+    dir.append("/");
+  return dir;
+}
diff --git a/test/osal-windows.cc b/test/osal-windows.cc
index b1a8928c..5d2e51a6 100644
--- a/test/osal-windows.cc
+++ b/test/osal-windows.cc
@@ -305,3 +305,9 @@ void osal_udelay(unsigned us) {
 }
 
 bool osal_istty(int fd) { return _isatty(fd) != 0; }
+
+std::string osal_tempdir(void) {
+  char buf[MAX_PATH + 1];
+  DWORD len = GetTempPathA(sizeof(buf), buf);
+  return std::string(buf, len);
+}
diff --git a/test/osal.h b/test/osal.h
index f75aae38..c27282a6 100644
--- a/test/osal.h
+++ b/test/osal.h
@@ -31,6 +31,7 @@ int osal_delay(unsigned seconds);
 void osal_udelay(unsigned us);
 void osal_yield(void);
 bool osal_istty(int fd);
+std::string osal_tempdir(void);
 
 #ifdef _MSC_VER
 #ifndef STDIN_FILENO