1 /*
2 *
3 * Copyright (c) International Business Machines Corp., 2001
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 /*
21 * Test Name: vfork02
22 *
23 * Test Description:
24 * Fork a process using vfork() and verify that, the pending signals in
25 * the parent are not pending in the child process.
26 * $
27 * Expected Result:
28 * The signal which is pending in the parent should not be pending in the
29 * child process.
30 *
31 * Algorithm:
32 * Setup:
33 * Setup signal handling.
34 * Pause for SIGUSR1 if option specified.
35 *
36 * Test:
37 * Loop if the proper options are given.
38 * Execute system call
39 * Check return code, if system call failed (return=-1)
40 * Log the errno and Issue a FAIL message.
41 * Otherwise,
42 * Verify the Functionality of system call
43 * if successful,
44 * Issue Functionality-Pass message.
45 * Otherwise,
46 * Issue Functionality-Fail message.
47 * Cleanup:
48 * Print errno log and/or timing stats if options given
49 *
50 * Usage: <for command-line>
51 * vfork02 [-c n] [-e] [-f] [-i n] [-I x] [-p x] [-t]
52 * where, -c n : Run n copies concurrently.
53 * -e : Turn on errno logging.
54 * -f : Turn off functionality Testing.
55 * -i n : Execute test n times.
56 * -I x : Execute test for x seconds.
57 * -P x : Pause for x seconds between iterations.
58 * -t : Turn on syscall timing.
59 *
60 * History
61 * 07/2001 John George
62 * -Ported
63 *
64 * Restrictions:
65 * None.
66 *
67 */
68 #define _GNU_SOURCE 1
69
70 #include <stdio.h>
71 #include <sys/types.h>
72 #include <errno.h>
73 #include <unistd.h>
74 #include <fcntl.h>
75 #include <string.h>
76 #include <signal.h>
77 #include <sys/stat.h>
78 #include <wait.h>
79
80 #include "test.h"
81
82 char *TCID = "vfork02";
83 int TST_TOTAL = 1;
84
85 void setup(); /* Main setup function of test */
86 void cleanup(); /* cleanup function for the test */
87 void sig_handler(); /* signal catching function */
88
main(int ac,char ** av)89 int main(int ac, char **av)
90 {
91 int lc;
92 pid_t cpid; /* process id of the child process */
93 int exit_status; /* exit status of child process */
94 sigset_t PendSig; /* variable to hold pending signal */
95
96 tst_parse_opts(ac, av, NULL, NULL);
97
98 setup();
99
100 for (lc = 0; TEST_LOOPING(lc); lc++) {
101
102 tst_count = 0;
103
104 /*
105 * Call vfork(2) to create a child process without
106 * fully copying the address space of parent.
107 */
108 TEST(vfork());
109
110 if ((cpid = TEST_RETURN) == -1) {
111 tst_resm(TFAIL, "vfork() Failed, errno=%d : %s",
112 TEST_ERRNO, strerror(TEST_ERRNO));
113 } else if (cpid == 0) { /* Child process */
114 /*
115 * Check whether the pending signal SIGUSR1
116 * in the parent is also pending in the child
117 * process by storing it in a variable.
118 */
119 if (sigpending(&PendSig) == -1) {
120 tst_resm(TFAIL, "sigpending function "
121 "failed in child");
122 _exit(1);
123 }
124
125 /* Check if SIGUSR1 is pending in child */
126 if (sigismember(&PendSig, SIGUSR1) != 0) {
127 tst_resm(TFAIL, "SIGUSR1 also pending "
128 "in child process");
129 _exit(1);
130 }
131
132 /*
133 * Exit with normal exit code if everything
134 * fine
135 */
136 _exit(0);
137 } else { /* parent process */
138 /*
139 * Let the parent process wait till child completes
140 * its execution.
141 */
142 wait(&exit_status);
143
144 /* Check for the exit status of child process */
145 if (WEXITSTATUS(exit_status) == 0) {
146 tst_resm(TPASS, "Call to vfork() "
147 "successful");
148 } else if (WEXITSTATUS(exit_status) == 1) {
149 tst_resm(TFAIL,
150 "Child process exited abnormally");
151 }
152 }
153 tst_count++; /* incr. TEST_LOOP counter */
154 }
155
156 cleanup();
157 tst_exit();
158
159 }
160
161 /*
162 * void
163 * setup() - performs all ONE TIME setup for this test.
164 * This function installs signal handler for SIGUSR1, puts signal SIGUSR1
165 * on hold and then sends the signal SIGUSR1 to itself so that it is in
166 * pending state.
167 */
setup(void)168 void setup(void)
169 {
170 sigset_t PendSig; /* variable to hold pending signal */
171
172 tst_sig(FORK, DEF_HANDLER, cleanup);
173
174 TEST_PAUSE;
175
176 /* Install the signal handler */
177 if (signal(SIGUSR1, sig_handler) == SIG_ERR) {
178 tst_brkm(TBROK, cleanup, "Fails to catch the signal SIGUSR1");
179 }
180
181 /* Hold the signal SIGUSR1 */
182 if (sighold(SIGUSR1) == -1) {
183 tst_brkm(TBROK, cleanup,
184 "sighold failed to hold the signal SIGUSR1");
185 }
186
187 /* Send the signal SIGUSR1 to itself so that SIGUSR1 is pending */
188 if (kill(getpid(), SIGUSR1) == -1) {
189 tst_brkm(TBROK, cleanup,
190 "Fails to send the signal to the parent process");
191 }
192
193 /* If SIGUSR1 is not pending in the parent, fail */
194 if (sigpending(&PendSig) == -1) {
195 tst_brkm(TBROK, cleanup,
196 "sigpending function failed in parent");
197 }
198
199 /* Check if SIGUSR1 is pending in parent */
200 if (sigismember(&PendSig, SIGUSR1) != 1) {
201 tst_brkm(TBROK, cleanup,
202 "SIGUSR1 signal is not pending in parent");
203 }
204 }
205
206 /*
207 * void
208 * sig_handler() - signal catching function for 'SIGUSR1' signal.
209 * $
210 * This is a null function and used only to catch the above signal
211 * generated in parent process.
212 */
sig_handler(void)213 void sig_handler(void)
214 {
215 }
216
217 /*
218 * void
219 * cleanup() - performs all ONE TIME cleanup for this test at
220 * completion or premature exit.
221 * Release the signal 'SIGUSR1' if still in pending state.
222 */
cleanup(void)223 void cleanup(void)
224 {
225
226 /* Release the signal 'SIGUSR1' if in pending state */
227 if (sigrelse(SIGUSR1) == -1) {
228 tst_brkm(TBROK, NULL, "Failed to release 'SIGUSR1' in cleanup");
229 }
230
231 }
232