Add two convenience functions in order to make sure we get these

environment variables in a consistent manner. These functions
retrieve the user and the temporary directories (based on the
system).

This commit was SVN r17815.

opal/util/opal_environ.c

@@ -217,3 +217,27 @@ int opal_unsetenv(const char *name, char ***env)
     return (found) ? OPAL_SUCCESS : OPAL_ERR_NOT_FOUND;
 }
 
+const char* opal_tmp_directory( void )
+{
+    const char* str;
+
+    if( NULL == (str = getenv("TMPDIR")) )
+        if( NULL == (str = getenv("TEMP")) )
+            if( NULL == (str = getenv("TMP")) )
+                if( NULL == (str = opal_home_directory()) )
+                    str = ".";
+    return str;
+}
+
+const char* opal_home_directory( void )
+{
+    char* home = getenv("HOME");
+
+#if defined(__WINDOWS__)
+    if( NULL == home )
+        home = getenv("USERPROFILE");
+#endif  /* defined(__WINDOWS__) */
+
+    return home;
+}
+

opal/util/opal_environ.h

@@ -123,6 +123,12 @@ OPAL_DECLSPEC int opal_setenv(const char *name, const char *value,
  */
 OPAL_DECLSPEC int opal_unsetenv(const char *name, char ***env) __opal_attribute_nonnull__(1);
 
+/* A consistent way to retrieve the home and tmp directory on all supported
+ * platforms.
+ */
+OPAL_DECLSPEC const char* opal_home_directory( void );
+OPAL_DECLSPEC const char* opal_tmp_directory( void );
+
 /* Some care is needed with environ on OS X when dealing with shared
    libraries.  Handle that care here... */
 #if !defined(__WINDOWS__)