tests: check how signals are unblocked in interactive mode

* tests/block_reset_raise_run.c: New file.
* tests/interactive_block.test: New test.
* tests/.gitignore: Add block_reset_raise_run.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(MISC_TESTS): Add interactive_block.test.

tests/.gitignore

@@ -17,6 +17,7 @@ attach-f-p
 attach-f-p-cmd
 attach-p-cmd-cmd
 attach-p-cmd-p
+block_reset_raise_run
 bpf
 brk
 btrfs

tests/Makefile.am

@@ -77,6 +77,7 @@ check_PROGRAMS = $(PURE_EXECUTABLES) \
 	attach-f-p-cmd \
 	attach-p-cmd-cmd \
 	attach-p-cmd-p \
+	block_reset_raise_run \
 	caps-abbrev \
 	count-f \
 	execve-v \
@@ -241,6 +242,7 @@ MISC_TESTS = \
 	detach-stopped.test \
 	filter-unavailable.test \
 	get_regs.test \
+	interactive_block.test \
 	ksysent.test \
 	opipe.test \
 	options-syntax.test \

tests/block_reset_raise_run.c

@@ -0,0 +1,55 @@
+/*
+ * Execute a command with blocked, reset, and raised signal.
+ *
+ * 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 < 3)
+		error_msg_and_fail("usage: block_reset_raise_run signo path...");
+
+	sigset_t mask;
+	sigemptyset(&mask);
+	const int signo = atoi(av[1]);
+	if (sigaddset(&mask, signo))
+		perror_msg_and_fail("sigaddset: %s", av[1]);
+	if (sigprocmask(SIG_BLOCK, &mask, NULL))
+		perror_msg_and_fail("sigprocmask");
+	if (signal(signo, SIG_DFL) == SIG_ERR)
+		perror_msg_and_fail("signal: %s", av[1]);
+	if (raise(signo))
+		perror_msg_and_fail("raise: %s", av[1]);
+
+	execvp(av[2], av + 2);
+	perror_msg_and_fail("execvp: %s", av[2]);
+}

tests/interactive_block.test

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+# Check that in interactive mode those signals that were blocked
+# at strace startup will remain blocked.
+
+. "${srcdir=.}/init.sh"
+
+strace0="$STRACE"
+for signo in 1 2 3 13 14 15; do
+	blocksig="../block_reset_raise_run $signo"
+	run_prog $blocksig ../umovestr
+	STRACE="$blocksig $strace0"
+	run_strace -I2 -echdir ../umovestr
+	match_diff "$LOG" "$srcdir/umovestr.expected"
+done