Adjust SA_RESTART workaround.

I want to get a bug report if something else than
DJGPP lacks SA_RESTART.

diff --git a/src/xz/message.c b/src/xz/message.c
index 19734e5be6387ea250c6ff1efe7436d69a100372..ad93573a0306872be4e9558efa8799f8ea78a64f 100644 (file)
--- a/src/xz/message.c
+++ b/src/xz/message.c
@@ -142,19 +142,19 @@ message_init(void)
 */
 
 #ifdef SIGALRM
-       // At least DJGPP lacks SA_RESTART. It's not essential for us (the
-       // rest of the code can handle interrupted system calls), so just
-       // define it zero.
-#      ifndef SA_RESTART
+       // DJGPP lacks SA_RESTART, but it shouldn't give EINTR
+       // in most places either.
+#      if defined(__DJGPP__) && !defined(SA_RESTART)
 #              define SA_RESTART 0
 #      endif
+
        // Establish the signal handlers which set a flag to tell us that
        // progress info should be updated. Since these signals don't
-       // require any quick action, we set SA_RESTART.
+       // require any quick action, we set SA_RESTART. That way we don't
+       // need to block them either in signals_block() to keep stdio
+       // functions from getting EINTR.
        static const int sigs[] = {
-#ifdef SIGALRM
                SIGALRM,
-#endif
 #ifdef SIGINFO
                SIGINFO,
 #endif