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 <sys/wait.h>
79
80 #include "test.h"
81 #include "safe_macros.h"
82
83 char *TCID = "vfork02";
84 int TST_TOTAL = 1;
85
86 void setup(); /* Main setup function of test */
87 void cleanup(); /* cleanup function for the test */
88 void sig_handler(); /* signal catching function */
89
main(int ac,char ** av)90 int main(int ac, char **av)
91 {
92 int lc;
93 pid_t cpid; /* process id of the child process */
94 int exit_status; /* exit status of child process */
95 sigset_t PendSig; /* variable to hold pending signal */
96
97 tst_parse_opts(ac, av, NULL, NULL);
98
99 setup();
100
101 for (lc = 0; TEST_LOOPING(lc); lc++) {
102
103 tst_count = 0;
104
105 /*
106 * Call vfork(2) to create a child process without
107 * fully copying the address space of parent.
108 */
109 TEST(vfork());
110
111 if ((cpid = TEST_RETURN) == -1) {
112 tst_resm(TFAIL, "vfork() Failed, errno=%d : %s",
113 TEST_ERRNO, strerror(TEST_ERRNO));
114 } else if (cpid == 0) { /* Child process */
115 /*
116 * Check whether the pending signal SIGUSR1
117 * in the parent is also pending in the child
118 * process by storing it in a variable.
119 */
120 if (sigpending(&PendSig) == -1) {
121 tst_resm(TFAIL, "sigpending function "
122 "failed in child");
123 _exit(1);
124 }
125
126 /* Check if SIGUSR1 is pending in child */
127 if (sigismember(&PendSig, SIGUSR1) != 0) {
128 tst_resm(TFAIL, "SIGUSR1 also pending "
129 "in child process");
130 _exit(1);
131 }
132
133 /*
134 * Exit with normal exit code if everything
135 * fine
136 */
137 _exit(0);
138 } else { /* parent process */
139 /*
140 * Let the parent process wait till child completes
141 * its execution.
142 */
143 wait(&exit_status);
144
145 /* Check for the exit status of child process */
146 if (WEXITSTATUS(exit_status) == 0) {
147 tst_resm(TPASS, "Call to vfork() "
148 "successful");
149 } else if (WEXITSTATUS(exit_status) == 1) {
150 tst_resm(TFAIL,
151 "Child process exited abnormally");
152 }
153 }
154 tst_count++; /* incr. TEST_LOOP counter */
155 }
156
157 cleanup();
158 tst_exit();
159
160 }
161
162 /*
163 * void
164 * setup() - performs all ONE TIME setup for this test.
165 * This function installs signal handler for SIGUSR1, puts signal SIGUSR1
166 * on hold and then sends the signal SIGUSR1 to itself so that it is in
167 * pending state.
168 */
setup(void)169 void setup(void)
170 {
171 sigset_t PendSig; /* variable to hold pending signal */
172
173 tst_sig(FORK, DEF_HANDLER, cleanup);
174
175 TEST_PAUSE;
176
177 /* Install the signal handler */
178 if (signal(SIGUSR1, sig_handler) == SIG_ERR) {
179 tst_brkm(TBROK, cleanup, "Fails to catch the signal SIGUSR1");
180 }
181
182 /* Hold the signal SIGUSR1 */
183 if (sighold(SIGUSR1) == -1) {
184 tst_brkm(TBROK, cleanup,
185 "sighold failed to hold the signal SIGUSR1");
186 }
187
188 /* Send the signal SIGUSR1 to itself so that SIGUSR1 is pending */
189 SAFE_KILL(cleanup, getpid(), SIGUSR1);
190
191 /* If SIGUSR1 is not pending in the parent, fail */
192 if (sigpending(&PendSig) == -1) {
193 tst_brkm(TBROK, cleanup,
194 "sigpending function failed in parent");
195 }
196
197 /* Check if SIGUSR1 is pending in parent */
198 if (sigismember(&PendSig, SIGUSR1) != 1) {
199 tst_brkm(TBROK, cleanup,
200 "SIGUSR1 signal is not pending in parent");
201 }
202 }
203
204 /*
205 * void
206 * sig_handler() - signal catching function for 'SIGUSR1' signal.
207 * $
208 * This is a null function and used only to catch the above signal
209 * generated in parent process.
210 */
sig_handler(void)211 void sig_handler(void)
212 {
213 }
214
215 /*
216 * void
217 * cleanup() - performs all ONE TIME cleanup for this test at
218 * completion or premature exit.
219 * Release the signal 'SIGUSR1' if still in pending state.
220 */
cleanup(void)221 void cleanup(void)
222 {
223
224 /* Release the signal 'SIGUSR1' if in pending state */
225 if (sigrelse(SIGUSR1) == -1) {
226 tst_brkm(TBROK, NULL, "Failed to release 'SIGUSR1' in cleanup");
227 }
228
229 }
230