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      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  *	waitpid01.c
     23  *
     24  * DESCRIPTION
     25  *	Check that when a child kills itself by generating an alarm
     26  *	exception, the waiting parent is correctly notified.
     27  *
     28  * ALGORITHM
     29  *	Fork a child that sets an alarm. When the alarm goes off, causing
     30  *	the death of the child, the parent checks that SIG_ALRM was returned
     31  *
     32  * USAGE:  <for command-line>
     33  *      waitpid01 [-c n] [-i n] [-I x] [-P x] [-t]
     34  *      where,  -c n : Run n copies concurrently.
     35  *              -i n : Execute test n times.
     36  *              -I x : Execute test for x seconds.
     37  *              -P x : Pause for x seconds between iterations.
     38  *              -t   : Turn on syscall timing.
     39  *
     40  * History
     41  *	07/2001 John George
     42  *		-Ported
     43  *
     44  * Restrictions
     45  *	None
     46  */
     47 
     48 #include <sys/signal.h>
     49 #include <sys/types.h>
     50 #include <sys/wait.h>
     51 #include <errno.h>
     52 #include "test.h"
     53 
     54 static void setup(void);
     55 static void cleanup(void);
     56 
     57 char *TCID = "waitpid01";
     58 int TST_TOTAL = 1;
     59 
     60 int main(int argc, char **argv)
     61 {
     62 	int lc;
     63 
     64 	int pid, npid, sig, nsig;
     65 	int exno, nexno, status;
     66 
     67 	tst_parse_opts(argc, argv, NULL, NULL);
     68 
     69 	setup();
     70 
     71 	/* check for looping state if -i option is given */
     72 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     73 		/* reset tst_count in case we are looping */
     74 		tst_count = 0;
     75 
     76 		exno = 1;
     77 		sig = 14;
     78 
     79 		pid = FORK_OR_VFORK();
     80 		if (pid < 0) {
     81 			tst_brkm(TFAIL, cleanup, "Fork Failed");
     82 		} else if (pid == 0) {
     83 			alarm(2);
     84 			pause();
     85 			exit(exno);
     86 		} else {
     87 			errno = 0;
     88 			while (((npid = waitpid(pid, &status, 0)) != -1) ||
     89 			       (errno == EINTR)) {
     90 				if (errno == EINTR)
     91 					continue;
     92 
     93 				if (npid != pid) {
     94 					tst_resm(TFAIL, "waitpid error: "
     95 						 "unexpected pid returned");
     96 				} else {
     97 					tst_resm(TPASS,
     98 						 "recieved expected pid");
     99 				}
    100 
    101 				nsig = WTERMSIG(status);
    102 
    103 				/*
    104 				 * nsig is the signal number returned by
    105 				 * waitpid
    106 				 */
    107 				if (nsig != sig) {
    108 					tst_resm(TFAIL, "waitpid error: "
    109 						 "unexpected signal "
    110 						 "returned");
    111 				} else {
    112 					tst_resm(TPASS, "recieved expected "
    113 						 "signal");
    114 				}
    115 
    116 				/*
    117 				 * nexno is the exit number returned by
    118 				 * waitpid
    119 				 */
    120 				nexno = WEXITSTATUS(status);
    121 				if (nexno != 0) {
    122 					tst_resm(TFAIL, "signal error: "
    123 						 "unexpected exit number "
    124 						 "returned");
    125 				}
    126 			}
    127 		}
    128 	}
    129 
    130 	cleanup();
    131 	tst_exit();
    132 }
    133 
    134 static void setup(void)
    135 {
    136 	TEST_PAUSE;
    137 }
    138 
    139 static void cleanup(void)
    140 {
    141 	tst_sig(FORK, DEF_HANDLER, cleanup);
    142 }
    143