/*
* 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"
char *TCID = "pidns20";
int TST_TOTAL = 1;
int parent_cinit[2];
int cinit_parent[2];
int broken = 1; /* broken should be 0 when test completes properly */
#define CHILD_PID 1
#define PARENT_PID 0
/*
* child_signal_handler() - to handle SIGUSR1
*/
static void child_signal_handler(int sig, siginfo_t * si, 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");
/* Disable broken flag */
broken = 0;
}
/*
* child_fn() - Inside container
*/
int child_fn(void *arg)
{
pid_t pid, ppid;
sigset_t newset;
struct sigaction sa;
char buf[5];
/* Setup pipe read and write ends */
pid = getpid();
ppid = getppid();
if (pid != CHILD_PID || ppid != PARENT_PID) {
printf("cinit: pidns was not created properly\n");
exit(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);
}
/* 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);
}
/* Now redefine handler for SIGUSR1 */
sa.sa_flags = SA_SIGINFO;
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);
/* Check if new handler is called */
if (broken == 1) {
printf("cinit: broken flag didn't change\n");
exit(1);
}
/* Cleanup and exit */
close(cinit_parent[1]);
close(parent_cinit[0]);
exit(0);
}
static void setup(void)
{
tst_require_root();
check_newpid();
}
int main(int argc, char *argv[])
{
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");
}
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!");
}
/* Enqueue SIGUSR1 in pending signal queue of container */
SAFE_KILL(NULL, cpid, SIGUSR1);
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));
}
/* Cleanup and exit */
close(parent_cinit[1]);
close(cinit_parent[0]);
tst_exit();
}