1 files changed, 168 insertions, 0 deletions

diff --git a/src/regress/lib/libc/sys/t_pipe.c b/src/regress/lib/libc/sys/t_pipe.c
new file mode 100644
index 0000000000..bd9805a4b9
--- /dev/null
+++ b/src/regress/lib/libc/sys/t_pipe.c
@@ -0,0 +1,168 @@
+/*      $OpenBSD: t_pipe.c,v 1.1.1.1 2019/11/19 19:57:04 bluhm Exp $    */
+/* $NetBSD: t_pipe.c,v 1.5 2017/01/13 21:30:41 christos Exp $ */
+
+/*-
+ * Copyright (c) 2001, 2008 The NetBSD Foundation, Inc.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#include "macros.h"
+
+#include <sys/cdefs.h>
+#include <sys/cdefs.h>
+__COPYRIGHT("@(#) Copyright (c) 2008\
+ The NetBSD Foundation, inc. All rights reserved.");
+__RCSID("$NetBSD: t_pipe.c,v 1.5 2017/01/13 21:30:41 christos Exp $");
+
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <sched.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "atf-c.h"
+
+#include "h_macros.h"
+
+static pid_t pid;
+static int nsiginfo = 0;
+
+/*
+ * This is used for both parent and child. Handle parent's SIGALRM,
+ * the childs SIGINFO doesn't need anything.
+ */
+static void
+sighand(int sig)
+{
+        if (sig == SIGALRM) {
+                kill(pid, SIGINFO);
+        }
+        if (sig == SIGINFO) {
+                nsiginfo++;
+        }
+}
+
+ATF_TC(pipe_restart);
+ATF_TC_HEAD(pipe_restart, tc)
+{
+        atf_tc_set_md_var(tc, "descr", "Checks that writing to pipe "
+            "works correctly after being interrupted and restarted "
+            "(kern/14087)");
+}
+
+ATF_TC_BODY(pipe_restart, tc)
+{
+        int pp[2], st;
+        ssize_t sz, todo, done;
+        char *f;
+        sigset_t asigset, osigset, emptysigset;
+
+        /* Initialise signal masks */
+        RL(sigemptyset(&emptysigset));
+        RL(sigemptyset(&asigset));
+        RL(sigaddset(&asigset, SIGINFO));
+
+        /* Register signal handlers for both read and writer */
+        REQUIRE_LIBC(signal(SIGINFO, sighand), SIG_ERR);
+        REQUIRE_LIBC(signal(SIGALRM, sighand), SIG_ERR);
+
+        todo = 2 * 1024 * 1024;
+        REQUIRE_LIBC(f = malloc(todo), NULL);
+
+        RL(pipe(pp));
+
+        RL(pid = fork());
+        if (pid == 0) {
+                /* child */
+                RL(close(pp[1]));
+
+                /* Do inital write. This should succeed, make
+                 * the other side do partial write and wait for us to pick
+                 * rest up.
+                 */
+                RL(done = read(pp[0], f, 128 * 1024));
+
+                /* Wait until parent is alarmed and awakens us */
+                RL(sigprocmask(SIG_BLOCK, &asigset, &osigset));
+                while (nsiginfo == 0) {
+                        if (sigsuspend(&emptysigset) != -1 || errno != EINTR)
+                                atf_tc_fail("sigsuspend(&emptysigset): %s",
+                                    strerror(errno));
+                }
+                RL(sigprocmask(SIG_SETMASK, &osigset, NULL));
+
+                /* Read all what parent wants to give us */
+                while((sz = read(pp[0], f, 1024 * 1024)) > 0)
+                        done += sz;
+
+                /*
+                 * Exit with 1 if number of bytes read doesn't match
+                 * number of expected bytes
+                 */
+                printf("Read:     %#zx\n", (size_t)done);
+                printf("Expected: %#zx\n", (size_t)todo);
+
+                exit(done != todo);
+
+                /* NOTREACHED */
+        } else {
+                RL(close(pp[0]));
+
+                /*
+                 * Arrange for alarm after two seconds. Since we have
+                 * handler setup for SIGARLM, the write(2) call should
+                 * be restarted internally by kernel.
+                 */
+                (void)alarm(2);
+
+                /* We write exactly 'todo' bytes. The very first write(2)
+                 * should partially succeed, block and eventually
+                 * be restarted by kernel
+                 */
+                while(todo > 0 && ((sz = write(pp[1], f, todo)) > 0))
+                        todo -= sz;
+
+                /* Close the pipe, so that child would stop reading */
+                RL(close(pp[1]));
+
+                /* And pickup child's exit status */
+                RL(waitpid(pid, &st, 0));
+
+                ATF_REQUIRE_EQ(WEXITSTATUS(st), 0);
+        }
+        free(f);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+        ATF_TP_ADD_TC(tp, pipe_restart);
+
+        return atf_no_error();
+}