pidns12.c revision f6d7f09ea8353429d488f586ff9cd9525699e31c 
1/*
2* Copyright (c) International Business Machines Corp., 2007
3* This program is free software; you can redistribute it and/or modify
4* it under the terms of the GNU General Public License as published by
5* the Free Software Foundation; either version 2 of the License, or
6* (at your option) any later version.
7* This program is distributed in the hope that it will be useful,
8* but WITHOUT ANY WARRANTY; without even the implied warranty of
9* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
10* the GNU General Public License for more details.
11* You should have received a copy of the GNU General Public License
12* along with this program; if not, write to the Free Software
13* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
14*
15***************************************************************************
16* File: pidns12.c
17* *
18* * Description:
19* *  The pidns12.c testcase verifies that siginfo->si_pid is set to 0
20* *  if sender (parent process) is not in receiver's namespace.
21* *
22* * Test Assertion & Strategy:
23* *  Create a PID namespace container.
24* *  Initialise signal handler for SIGUSR1 in container.
25* *  Let parent send SIGUSR1 to container.
26* *  Check if sender pid is set to 0 from signal info.
27* *
28* * Usage: <for command-line>
29* *  pidns12
30* *
31* * History:
32* *  DATE      NAME                             DESCRIPTION
33* *  13/11/08  Gowrishankar M 			Creation of this test.
34* *            <gowrishankar.m@in.ibm.com>
35*
36******************************************************************************/
37#define _GNU_SOURCE 1
38#include <sys/wait.h>
39#include <sys/types.h>
40#include <signal.h>
41#include <string.h>
42#include <stdlib.h>
43#include <unistd.h>
44#include <stdio.h>
45#include <usctest.h>
46#include <test.h>
47#include <libclone.h>
48
49char *TCID = "pidns12";
50int TST_TOTAL = 1;
51int errno;
52int pipefd[2];
53
54#define CHILD_PID       1
55#define PARENT_PID      0
56
57/*
58 * cleanup() - performs all ONE TIME cleanup for this test at
59 *             completion or premature exit.
60 */
61void cleanup()
62{
63	/* Clean the test testcase as LTP wants*/
64	TEST_CLEANUP;
65
66	/* exit with return code appropriate for results */
67	tst_exit();
68}
69
70/*
71 * child_signal_handler() - dummy function for sigaction()
72 */
73static void child_signal_handler(int sig, siginfo_t *si, void *unused)
74{
75	/* Recieved SIGUSR1. Check sender pid */
76	if (si->si_pid == 0)
77		tst_resm(TPASS, "cinit: signalling PID (from other namespace)"\
78				" is 0 as expected");
79	else
80		tst_resm(TFAIL, "cinit: signalling PID (from other namespace)"\
81				" is not 0, but %d.", si->si_pid);
82}
83
84/*
85 * child_fn() - Inside container
86 */
87int child_fn(void *arg)
88{
89	struct sigaction sa;
90	pid_t pid, ppid;
91
92	/* Set process id and parent pid */
93	pid = getpid();
94	ppid = getppid();
95	if (pid != CHILD_PID || ppid != PARENT_PID) {
96		tst_resm(TBROK, "cinit: pidns is not created.");
97		cleanup();
98	}
99
100	/* Close read end of pipe */
101	close(pipefd[0]);
102
103	/* Set signal handler for SIGUSR1 */
104	sa.sa_flags = SA_SIGINFO;
105	sigfillset(&sa.sa_mask);
106	sa.sa_sigaction = child_signal_handler;
107	if (sigaction(SIGUSR1, &sa, NULL) == -1) {
108		tst_resm(TBROK, "cinit: sigaction() failed(%s).",\
109				strerror(errno));
110		cleanup();
111	}
112
113	/* Let parent to signal SIGUSR1 */
114	if (write(pipefd[1], "c:go\0", 5) != 5) {
115		tst_resm(TBROK, "cinit: pipe is broken to write");
116		cleanup();
117	}
118
119	sleep(3);
120
121	/* cleanup and exit */
122	close(pipefd[1]);
123	cleanup();
124
125	/* Control won't reach below */
126	exit(0);
127}
128
129
130/***********************************************************************
131*   M A I N
132***********************************************************************/
133
134int main(int argc, char *argv[])
135{
136	int status;
137	pid_t pid, cpid;
138	char buf[5];
139
140	pid = getpid();
141	tst_resm(TINFO, "parent: PID is %d", pid);
142
143	/* Create pipe for intercommunication */
144	if (pipe(pipefd) == -1) {
145		tst_resm(TBROK, "parent: pipe() failed. aborting!");
146		cleanup();
147	}
148
149	cpid = ltp_clone_quick(CLONE_NEWPID|SIGCHLD, child_fn, NULL);
150	if (cpid < 0) {
151		tst_resm(TBROK, "parent: clone() failed(%s).",\
152				strerror(errno));
153		cleanup();
154	}
155
156	/* Close write end of pipe */
157	close(pipefd[1]);
158
159	/* Check if container is ready */
160	read(pipefd[0], buf, 5);
161	if (strcmp(buf, "c:go") != 0) {
162		tst_resm(TBROK, "parent: container did not respond!");
163		cleanup();
164	}
165
166	/* Send SIGUSR1 to container init */
167	if (kill(cpid, SIGUSR1) == -1) {
168		tst_resm(TBROK, "parent: kill() failed(%s).", strerror(errno));
169		cleanup();
170	}
171
172	if (waitpid(cpid, &status, 0) < 0)
173		tst_resm(TWARN, "parent: waitpid() failed(%s).",\
174				strerror(errno));
175
176	if (WIFSIGNALED(status) && WTERMSIG(status))
177		tst_resm(TBROK, "child is terminated by signal(%s)",\
178				strsignal(WTERMSIG(status)));
179
180	/* Cleanup and exit */
181	close(pipefd[0]);
182	cleanup();
183
184	/* Control won't reach below */
185	exit(0);
186
187}	/* End main */
188