[LTP] [PATCH v1] Refactor pidns20 test using new LTP API

Andrea Cervesato andrea.cervesato@suse.com
Tue Aug 9 13:26:26 CEST 2022


Signed-off-by: Andrea Cervesato <andrea.cervesato@suse.com>
---
 testcases/kernel/containers/pidns/pidns20.c | 226 +++++---------------
 1 file changed, 53 insertions(+), 173 deletions(-)

diff --git a/testcases/kernel/containers/pidns/pidns20.c b/testcases/kernel/containers/pidns/pidns20.c
index ec2c66bd3..eb6fd2083 100644
--- a/testcases/kernel/containers/pidns/pidns20.c
+++ b/testcases/kernel/containers/pidns/pidns20.c
@@ -1,207 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
-* Copyright (c) International Business Machines Corp., 2007
-* This program is free software; you can redistribute it and/or modify
-* it under the terms of the GNU General Public License as published by
-* the Free Software Foundation; either version 2 of the License, or
-* (at your option) any later version.
-* This program is distributed in the hope that it will be useful,
-* but WITHOUT ANY WARRANTY; without even the implied warranty of
-* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
-* the GNU General Public License for more details.
-* You should have received a copy of the GNU General Public License
-* along with this program; if not, write to the Free Software
-* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
-*
-***************************************************************************
-* File: pidns20.c
-* *
-* * Description:
-* *  The pidns20.c testcase verifies that signal handler of SIGUSR1 is called
-* *  (and cinit is NOT terminated) when:
-* *    - container-init blocks SIGUSR1,
-* *    - parent queues SIGUSR1 and
-* *    - a handler is specified for SIGUSR1 before it is unblocked.
-* *
-* * Test Assertion & Strategy:
-* *  Create a PID namespace container.
-* *  Block SIGUSR1 signal inside it.
-* *  Let parent to deliver SIGUSR1 signal to container.
-* *  Redefine SIGUSR1 handler of cinit to user function.
-* *  Unblock SIGUSR1 from blocked queue.
-* *  Check if user function is called.
-* *
-* * Usage: <for command-line>
-* *  pidns20
-* *
-* * History:
-* *  DATE      NAME                             DESCRIPTION
-* *  13/11/08  Gowrishankar M 			Creation of this test.
-* *            <gowrishankar.m@in.ibm.com>
-*
-******************************************************************************/
-#define _GNU_SOURCE 1
-#include <sys/wait.h>
-#include <sys/types.h>
-#include <signal.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-#include "pidns_helper.h"
-#include "test.h"
-#include "safe_macros.h"
+ * Copyright (c) International Business Machines Corp., 2007
+ *               13/11/08  Gowrishankar M  <gowrishankar.m@in.ibm.com>
+ * Copyright (C) 2022 SUSE LLC Andrea Cervesato <andrea.cervesato@suse.com>
+ */
 
-char *TCID = "pidns20";
-int TST_TOTAL = 1;
+/*\
+ * [Description]
+ *
+ * Clone a process with CLONE_NEWPID flag, block SIGUSR1 signal before sending
+ * it from parent and check if it's received once SIGUSR1 signal is unblocked.
+ */
 
-int parent_cinit[2];
-int cinit_parent[2];
-int broken = 1;			/* broken should be 0 when test completes properly */
+#define _GNU_SOURCE 1
+#include <signal.h>
+#include "tst_test.h"
+#include "lapi/namespaces_constants.h"
 
-#define CHILD_PID       1
-#define PARENT_PID      0
+static int passed = 0;
 
-/*
- * child_signal_handler() - to handle SIGUSR1
- */
-static void child_signal_handler(int sig, siginfo_t * si, void *unused)
+static void child_signal_handler(LTP_ATTRIBUTE_UNUSED int sig, siginfo_t *si, LTP_ATTRIBUTE_UNUSED void *unused)
 {
 	if (si->si_signo != SIGUSR1)
-		tst_resm(TBROK, "cinit: received %s unexpectedly!",
-			 strsignal(si->si_signo));
-	else
-		tst_resm(TPASS, "cinit: user function is called as expected");
+		tst_brk(TBROK, "Received %s unexpectedly!", tst_strsig(si->si_signo));
 
-	/* Disable broken flag */
-	broken = 0;
+	passed++;
 }
 
-/*
- * child_fn() - Inside container
- */
-int child_fn(void *arg)
+static int child_func(LTP_ATTRIBUTE_UNUSED void *arg)
 {
-	pid_t pid, ppid;
-	sigset_t newset;
 	struct sigaction sa;
-	char buf[5];
+	sigset_t newset;
+	pid_t cpid, ppid;
 
-	/* Setup pipe read and write ends */
-	pid = getpid();
+	cpid = getpid();
 	ppid = getppid();
 
-	if (pid != CHILD_PID || ppid != PARENT_PID) {
-		printf("cinit: pidns was not created properly\n");
-		exit(1);
+	if (cpid != 1 || ppid != 0) {
+		tst_res(TFAIL, "Got unexpected result of cpid=%d ppid=%d", cpid, ppid);
+		return 1;
 	}
 
-	/* Setup pipes to communicate with parent */
-	close(cinit_parent[0]);
-	close(parent_cinit[1]);
-
-	/* Block SIGUSR1 signal */
-	sigemptyset(&newset);
-	sigaddset(&newset, SIGUSR1);
-	if (sigprocmask(SIG_BLOCK, &newset, 0) == -1) {
-		perror("cinit: sigprocmask() failed");
-		exit(1);
-	}
-	tst_resm(TINFO, "cinit: blocked SIGUSR1");
-
-	/* Let parent to queue SIGUSR1 in pending */
-	if (write(cinit_parent[1], "c:go", 5) != 5) {
-		perror("cinit: pipe is broken to write");
-		exit(1);
-	}
+	SAFE_SIGEMPTYSET(&newset);
+	SAFE_SIGADDSET(&newset, SIGUSR1);
+	SAFE_SIGPROCMASK(SIG_BLOCK, &newset, 0);
 
-	/* Check if parent has queued up SIGUSR1 */
-	read(parent_cinit[0], buf, 5);
-	if (strcmp(buf, "p:go") != 0) {
-		printf("cinit: parent did not respond!\n");
-		exit(1);
-	}
+	TST_CHECKPOINT_WAKE_AND_WAIT(0);
 
-	/* Now redefine handler for SIGUSR1 */
 	sa.sa_flags = SA_SIGINFO;
-	sigfillset(&sa.sa_mask);
+	SAFE_SIGFILLSET(&sa.sa_mask);
 	sa.sa_sigaction = child_signal_handler;
-	if (sigaction(SIGUSR1, &sa, NULL) == -1) {
-		perror("cinit: sigaction failed");
-		exit(1);
-	}
 
-	/* Unblock traffic on SIGUSR1 queue */
-	tst_resm(TINFO, "cinit: unblocking SIGUSR1");
-	sigprocmask(SIG_UNBLOCK, &newset, 0);
+	SAFE_SIGACTION(SIGUSR1, &sa, NULL);
 
-	/* Check if new handler is called */
-	if (broken == 1) {
-		printf("cinit: broken flag didn't change\n");
-		exit(1);
+	SAFE_SIGPROCMASK(SIG_UNBLOCK, &newset, 0);
+
+	if (!passed){
+		tst_res(TFAIL, "User function has not been called after unblocking signal");
+		return 1;
 	}
 
-	/* Cleanup and exit */
-	close(cinit_parent[1]);
-	close(parent_cinit[0]);
-	exit(0);
-}
+	tst_res(TPASS, "User function is called as expected after unblocking signal");
 
-static void setup(void)
-{
-	tst_require_root();
-	check_newpid();
+	return 0;
 }
 
-int main(void)
+static void run(void)
 {
-	int status;
-	char buf[5];
-	pid_t cpid;
-
-	setup();
-
-	/* Create pipes for intercommunication */
-	if (pipe(parent_cinit) == -1 || pipe(cinit_parent) == -1) {
-		tst_brkm(TBROK | TERRNO, NULL, "pipe failed");
-	}
+	int ret;
 
-	cpid = ltp_clone_quick(CLONE_NEWPID | SIGCHLD, child_fn, NULL);
-	if (cpid == -1) {
-		tst_brkm(TBROK | TERRNO, NULL, "clone failed");
-	}
-
-	/* Setup pipe read and write ends */
-	close(cinit_parent[1]);
-	close(parent_cinit[0]);
-
-	/* Is container ready */
-	read(cinit_parent[0], buf, 5);
-	if (strcmp(buf, "c:go") != 0) {
-		tst_brkm(TBROK, NULL, "parent: container did not respond!");
-	}
+	ret = ltp_clone_quick(CLONE_NEWPID | SIGCHLD, child_func, NULL);
+	if (ret < 0)
+		tst_brk(TBROK | TERRNO, "clone failed");
 
-	/* Enqueue SIGUSR1 in pending signal queue of container */
-	SAFE_KILL(NULL, cpid, SIGUSR1);
+	TST_CHECKPOINT_WAIT(0);
 
-	tst_resm(TINFO, "parent: signalled SIGUSR1 to container");
-	if (write(parent_cinit[1], "p:go", 5) != 5) {
-		tst_brkm(TBROK | TERRNO, NULL, "write failed");
-	}
-
-	/* collect exit status of child */
-	SAFE_WAIT(NULL, &status);
-
-	if (WIFSIGNALED(status)) {
-		if (WTERMSIG(status) == SIGUSR1)
-			tst_resm(TFAIL,
-				 "user function was not called inside cinit");
-		else
-			tst_resm(TBROK,
-				 "cinit was terminated by %d",
-				 WTERMSIG(status));
-	}
+	SAFE_KILL(ret, SIGUSR1);
 
-	/* Cleanup and exit */
-	close(parent_cinit[1]);
-	close(cinit_parent[0]);
-	tst_exit();
+	TST_CHECKPOINT_WAKE(0);
 }
+
+static struct tst_test test = {
+	.test_all = run,
+	.needs_root = 1,
+	.needs_checkpoints = 1,
+};
-- 
2.35.3



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