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 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 "recieved 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, "recieved 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, "recieved expected " 138 "exit value"); 139 } 140 } 141 } 142 } 143 144 tst_exit(); 145 } 146 147 static void do_child(void) 148 { 149 int exno = 1; 150 151 while (1) 152 usleep(10); 153 154 exit(exno); 155 } 156 157 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
