File _service:tar_scm:backport-lib-pager-fix-signal-... of Package util-linux

File _service:tar_scm:backport-lib-pager-fix-signal-safety-issues.patch of Package util-linux (Revision 9db418d35e86e968e17c79629c7fc1f5)

Currently displaying revision 9db418d35e86e968e17c79629c7fc1f5 , Show latest

From 518a0ad4d9c586ca69d3cf924a4328361f6b2a80 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cristian=20Rodr=C3=ADguez?= <crrodriguez@opensuse.org>
Date: Sun, 15 Jan 2023 01:33:14 +0000
Subject: [PATCH] lib:pager: fix signal safety issues

- Cannot use stdio in signal handlers, so you cannot safely call
  fflush.
- cannot call exit() but only _exit()
---
 lib/pager.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/pager.c b/lib/pager.c
index e5bd07a47..8f62310c0 100644
--- a/lib/pager.c
+++ b/lib/pager.c
@@ -114,7 +114,9 @@ static int wait_or_whine(pid_t pid)
 		if (waiting < 0) {
 			if (errno == EINTR)
 				continue;
-			err(EXIT_FAILURE, _("waitpid failed (%s)"), strerror(errno));
+			/* Can't err() on signal handler */
+			ignore_result(write(STDERR_FILENO, "waitpid failed", 14));
+			_exit(EXIT_FAILURE);
 		}
 		if (waiting != pid)
 			return -1;
@@ -163,8 +165,6 @@ static void wait_for_pager(void)
 	if (pager_process.pid == 0)
 		return;
 
-	fflush(stdout);
-	fflush(stderr);
 	/* signal EOF to pager */
 	close(STDOUT_FILENO);
 	close(STDERR_FILENO);
-- 
2.27.0