svn commit: r361003 - user/pho/stress2/misc

[Peter Holm]

Author: pho
Date: Wed May 13 06:41:42 2020
New Revision: 361003
URL: https://svnweb.freebsd.org/changeset/base/361003

Log:
  Added a regression test.
  
  PR:		246385

Added:
  user/pho/stress2/misc/sigfastblock2.sh   (contents, props changed)

Added: user/pho/stress2/misc/sigfastblock2.sh
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ user/pho/stress2/misc/sigfastblock2.sh	Wed May 13 06:41:42 2020	(r361003)
@@ -0,0 +1,134 @@
+#!/bin/sh
+
+#
+# SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+#
+# Copyright (c) 2020 corydoras at ridiculousfish.com
+#
+# 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.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+#
+# $FreeBSD$
+#
+
+# The test scenario is from:
+# Bug 246385 - SIGCHLD dropped if generated while blocked in sigfastblock
+# https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246385
+# Fixed by r360940
+
+. ../default.cfg
+
+cat > /tmp/sigfastblock2.c <<EOF
+#include <assert.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/time.h>
+
+static int pipes[2];
+
+static void assert_noerr(int res)
+{
+    if (res < 0)
+    {
+        fprintf(stderr, "error: %s", strerror(res));
+        exit(EXIT_FAILURE);
+    }
+}
+
+static void sigchld_handler(int sig)
+{
+    // Write a byte to the write end of pipes.
+    (void)sig;
+    char c = 0;
+    ssize_t amt = write(pipes[1], &c, 1);
+    if (amt < 0)
+    {
+        perror("write");
+        exit(EXIT_FAILURE);
+    }
+}
+
+static pid_t spawn_child()
+{
+    pid_t pid = fork();
+    assert_noerr(pid);
+    if (pid == 0)
+    {
+        _exit(0);
+    }
+    return pid;
+}
+
+int main(void)
+{
+    // Install SIGCHLD handler with SA_RESTART.
+    struct sigaction chld_act = {};
+    sigemptyset(&chld_act.sa_mask);
+    chld_act.sa_handler = &sigchld_handler;
+    chld_act.sa_flags = SA_RESTART;
+    assert_noerr(sigaction(SIGCHLD, &chld_act, NULL));
+
+    // Make our self-pipes.
+    assert_noerr(pipe(pipes));
+
+    // Spawn and reap children in a loop.
+    for (;;)
+    {
+        // Spawn a child.
+        pid_t child = spawn_child();
+        assert(child >= 0 && "Invalid pid");
+
+        // Wait for the SIGCHLD handler to write to us.
+        for (;;)
+        {
+            char buf[PIPE_BUF];
+	    alarm(5);
+            ssize_t amt = read(pipes[0], buf, sizeof buf);
+            if (amt >= 0)
+                break;
+	    alarm(0);
+        }
+
+        // Reap it.
+        int status = 0;
+        int pid_res = waitpid(child, &status, WUNTRACED | WCONTINUED);
+        assert(pid_res == child && "Unexpected pid");
+    }
+
+    return 0;
+}
+EOF
+mycc -o /tmp/sigfastblock2 -Wall -Wextra /tmp/sigfastblock2.c -lpthread ||
+    exit 1
+
+timeout 5m /tmp/sigfastblock2; s=$?
+[ $s -eq 124 ] && s=0
+
+rm -f /tmp/sigfastblock2 /tmp/sigfastblock2.c
+exit $s