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 * NAME
22 * waitpid02.c
23 *
24 * DESCRIPTION
25 * Check that when a child gets killed by an integer zero
26 * divide exception, the waiting parent is correctly notified.
27 *
28 * ALGORITHM
29 * Fork a child and send a SIGFPE to it. The parent waits for the
30 * death of the child and checks that SIGFPE was returned.
31 *
32 * USAGE: <for command-line>
33 * waitpid02 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
34 * where, -c n : Run n copies concurrently.
35 * -e : Turn on errno logging.
36 * -i n : Execute test n times.
37 * -I x : Execute test for x seconds.
38 * -P x : Pause for x seconds between iterations.
39 * -t : Turn on syscall timing.
40 *
41 * History
42 * 07/2001 John George
43 * -Ported
44 * 10/2002 Paul Larson
45 * Div by zero doesn't cause SIGFPE on some archs, fixed
46 * to send the signal with kill
47 *
48 * Restrictions
49 * None
50 */
51
52 #include <sys/file.h>
53 #include <sys/resource.h>
54 #include <sys/signal.h>
55 #include <sys/types.h>
56 #include <sys/wait.h>
57 #include <errno.h>
58 #include "test.h"
59
60 static void do_child(void);
61 static void setup(void);
62
63 char *TCID = "waitpid02";
64 int TST_TOTAL = 1;
65
main(int argc,char ** argv)66 int main(int argc, char **argv)
67 {
68 int lc;
69
70 int pid, npid, sig, nsig;
71 int nexno, status;
72
73 tst_parse_opts(argc, argv, NULL, NULL);
74 #ifdef UCLINUX
75 maybe_run_child(&do_child, "");
76 #endif
77
78 setup();
79
80 for (lc = 0; TEST_LOOPING(lc); lc++) {
81 tst_count = 0;
82
83 sig = SIGFPE;
84
85 pid = FORK_OR_VFORK();
86
87 if (pid < 0)
88 tst_brkm(TBROK|TERRNO, NULL, "fork failed");
89
90 if (pid == 0) {
91 #ifdef UCLINUX
92 self_exec(argv[0], "");
93 /* No fork() error check is done so don't check here */
94 #else
95 do_child();
96 #endif
97 } else {
98 kill(pid, sig);
99 errno = 0;
100 while (((npid = waitpid(pid, &status, 0)) != -1) ||
101 (errno == EINTR)) {
102 if (errno == EINTR)
103 continue;
104
105 if (npid != pid) {
106 tst_resm(TFAIL, "waitpid error: "
107 "unexpected pid returned");
108 } else {
109 tst_resm(TPASS,
110 "received expected pid");
111 }
112
113 nsig = WTERMSIG(status);
114
115 /*
116 * nsig is the signal number returned by
117 * waitpid
118 */
119 if (nsig != sig) {
120 tst_resm(TFAIL, "waitpid error: "
121 "unexpected signal returned");
122 } else {
123 tst_resm(TPASS, "received expected "
124 "signal");
125 }
126
127 /*
128 * nexno is the exit number returned by
129 * waitpid
130 */
131 nexno = WEXITSTATUS(status);
132 if (nexno != 0) {
133 tst_resm(TFAIL, "signal error: "
134 "unexpected exit number "
135 "returned");
136 } else {
137 tst_resm(TPASS, "received expected "
138 "exit value");
139 }
140 }
141 }
142 }
143
144 tst_exit();
145 }
146
do_child(void)147 static void do_child(void)
148 {
149 int exno = 1;
150
151 while (1)
152 usleep(10);
153
154 exit(exno);
155 }
156
setup(void)157 static void setup(void)
158 {
159 /* SIGFPE is expected signal, so avoid creating any corefile.
160 * '1' is a special value, that will also avoid dumping via pipe. */
161 struct rlimit r;
162 r.rlim_cur = 1;
163 r.rlim_max = 1;
164 setrlimit(RLIMIT_CORE, &r);
165
166 TEST_PAUSE;
167 }
168