Add and use DBUS_TIMEOUT_INFINITE and DBUS_TIMEOUT_USE_DEFAULT

The documentation claimed that INT_MAX (whatever that means) meant the
default, but the value that has actually always been checked for is
0x7fffffff (aka INT32_MAX on the competent platforms we sadly don't
restrict our portability to), so we should use that. (In practice D-Bus
probably never worked on platforms where int wasn't 32 bits, though.)

Reviewed-by: Will Thompson <will.thompson@collabora.co.uk>
Bug: https://bugs.freedesktop.org/show_bug.cgi?id=34570

dbus/dbus-connection.c

@@ -3313,8 +3313,9 @@ reply_handler_timeout (void *data)
  *
  * If -1 is passed for the timeout, a sane default timeout is used. -1
  * is typically the best value for the timeout for this reason, unless
- * you want a very short or very long timeout.  If INT_MAX is passed for
- * the timeout, no timeout will be set and the call will block forever.
+ * you want a very short or very long timeout.  If #DBUS_TIMEOUT_INFINITE is
+ * passed for the timeout, no timeout will be set and the call will block
+ * forever.
  *
  * @warning if the connection is disconnected or you try to send Unix
  * file descriptors on a connection that does not support them, the
@@ -3326,7 +3327,9 @@ reply_handler_timeout (void *data)
  * object, or #NULL if connection is disconnected or when you try to
  * send Unix file descriptors on a connection that does not support
  * them.
- * @param timeout_milliseconds timeout in milliseconds, -1 for default or INT_MAX for no timeout
+ * @param timeout_milliseconds timeout in milliseconds, -1 (or
+ *  #DBUS_TIMEOUT_USE_DEFAULT) for default or #DBUS_TIMEOUT_INFINITE for no
+ *  timeout
  * @returns #FALSE if no memory, #TRUE otherwise.
  *
  */
@@ -3459,7 +3462,9 @@ dbus_connection_send_with_reply (DBusConnection     *connection,
  *
  * @param connection the connection
  * @param message the message to send
- * @param timeout_milliseconds timeout in milliseconds, -1 for default or INT_MAX for no timeout.
+ * @param timeout_milliseconds timeout in milliseconds, -1 (or
+ *  #DBUS_TIMEOUT_USE_DEFAULT) for default or #DBUS_TIMEOUT_INFINITE for no
+ *  timeout
  * @param error return location for error message
  * @returns the message that is the reply or #NULL with an error code if the
  * function fails.

dbus/dbus-pending-call.c

@@ -84,7 +84,9 @@ static dbus_int32_t notify_user_data_slot = -1;
  * Creates a new pending reply object.
  *
  * @param connection connection where reply will arrive
- * @param timeout_milliseconds length of timeout, -1 for default, INT_MAX for no timeout
+ * @param timeout_milliseconds length of timeout, -1 (or
+ *  #DBUS_TIMEOUT_USE_DEFAULT) for default,
+ *  #DBUS_TIMEOUT_INFINITE for no timeout
  * @param timeout_handler timeout handler, takes pending call as data
  * @returns a new #DBusPendingCall or #NULL if no memory.
  */
@@ -112,7 +114,7 @@ _dbus_pending_call_new_unlocked (DBusConnection    *connection,
       return NULL;
     }
 
-  if (timeout_milliseconds != _DBUS_INT_MAX)
+  if (timeout_milliseconds != DBUS_TIMEOUT_INFINITE)
     {
       timeout = _dbus_timeout_new (timeout_milliseconds,
                                    timeout_handler,
@@ -515,6 +517,26 @@ _dbus_pending_call_set_data_unlocked (DBusPendingCall  *pending,
  * @{
  */
 
+/**
+ * @def DBUS_TIMEOUT_INFINITE
+ *
+ * An integer constant representing an infinite timeout. This has the
+ * numeric value 0x7fffffff (the largest 32-bit signed integer).
+ *
+ * For source compatibility with D-Bus versions earlier than 1.4.12, use
+ * 0x7fffffff, or INT32_MAX (assuming your platform has it).
+ */
+
+/**
+ * @def DBUS_TIMEOUT_USE_DEFAULT
+ *
+ * An integer constant representing a request to use the default timeout.
+ * This has numeric value -1.
+ *
+ * For source compatibility with D-Bus versions earlier than 1.4.12, use a
+ * literal -1.
+ */
+
 /**
  * @typedef DBusPendingCall
  *

dbus/dbus-pending-call.h

@@ -38,6 +38,9 @@ DBUS_BEGIN_DECLS
  * @{
  */
 
+#define DBUS_TIMEOUT_INFINITE ((int) 0x7fffffff)
+#define DBUS_TIMEOUT_USE_DEFAULT (-1)
+
 DBUS_EXPORT
 DBusPendingCall* dbus_pending_call_ref       (DBusPendingCall               *pending);
 DBUS_EXPORT