tests: check signal mask transparency

Starting with commit v4.17-5-gf83b49b strace is expected
to forward the signal mask to tracees unchanged.

* tests/check_sigblock.c: New file.
* tests/set_sigblock.c: Likewise.
* tests/sigblock.test: New test.
* tests/.gitignore: Add check_sigblock and set_sigblock.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(MISC_TESTS): Add sigblock.test.

1 files changed, 53 insertions, 0 deletions

diff --git a/tests/set_sigblock.c b/tests/set_sigblock.c
new file mode 100644
index 000000000..4786322c2
--- /dev/null
+++ b/tests/set_sigblock.c
@@ -0,0 +1,53 @@
+/*
+ * Execute a command with the specified signal blocked/unblocked.
+ *
+ * Copyright (c) 2017 Dmitry V. Levin <ldv@altlinux.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "tests.h"
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int
+main(int ac, char **av)
+{
+	if (ac < 4)
+		error_msg_and_fail("usage: set_sigblock 0|1 signum path...");
+
+	const int block = atoi(av[1]);
+	const int signum = atoi(av[2]);
+	sigset_t mask;
+
+	sigemptyset(&mask);
+	if (sigaddset(&mask, signum))
+		perror_msg_and_fail("sigaddset: %s", av[2]);
+	if (sigprocmask(block ? SIG_BLOCK : SIG_UNBLOCK, &mask, NULL))
+		perror_msg_and_fail("sigprocmask");
+
+	execvp(av[3], av + 3);
+	perror_msg_and_fail("execvp: %s", av[3]);
+}