xz: Use the self-pipe trick to avoid a race condition with signals.

It is possible that a signal to set user_abort arrives right
before a blocking system call is made. In this case the call
may block until another signal arrives, while the wanted
behavior is to make xz clean up and exit as soon as possible.

After this commit, the race condition is avoided with the
input side which already uses non-blocking I/O. The output
side still uses blocking I/O and thus has the race condition.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/xz/signals.c b/src/xz/signals.c
index de213644..2a1d4eb7 100644
--- a/src/xz/signals.c
+++ b/src/xz/signals.c
@@ -41,6 +41,11 @@ signal_handler(int sig)
 {
 	exit_signal = sig;
 	user_abort = true;
+
+#ifndef TUKLIB_DOSLIKE
+	io_write_to_user_abort_pipe();
+#endif
+
 	return;
 }