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      1 /*
      2  * Copyright (c) 2004, Bull S.A..  All rights reserved.
      3  * Created by: Sebastien Decugis
      4 
      5  * This program is free software; you can redistribute it and/or modify it
      6  * under the terms of version 2 of the GNU General Public License as
      7  * published by the Free Software Foundation.
      8  *
      9  * This program is distributed in the hope that it would be useful, but
     10  * WITHOUT ANY WARRANTY; without even the implied warranty of
     11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
     12  *
     13  * You should have received a copy of the GNU General Public License along
     14  * with this program; if not, write the Free Software Foundation, Inc.,
     15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
     16 
     17  * This sample test aims to check the following assertion:
     18  *
     19  * The function does not return EINTR
     20 
     21  * The steps are:
     22  * -> kill a thread which calls pthread_equal
     23  * -> check that EINTR is never returned
     24 
     25  */
     26 
     27  /* We are testing conformance to IEEE Std 1003.1, 2003 Edition */
     28 #define _POSIX_C_SOURCE 200112L
     29 
     30 /********************************************************************************************/
     31 /****************************** standard includes *****************************************/
     32 /********************************************************************************************/
     33 #include <pthread.h>
     34 #include <stdarg.h>
     35 #include <stdio.h>
     36 #include <stdlib.h>
     37 #include <string.h>
     38 #include <unistd.h>
     39 
     40 #include <semaphore.h>
     41 #include <errno.h>
     42 #include <signal.h>
     43 
     44 /********************************************************************************************/
     45 /******************************   Test framework   *****************************************/
     46 /********************************************************************************************/
     47 #include "../testfrmw/testfrmw.h"
     48 #include "../testfrmw/testfrmw.c"
     49  /* This header is responsible for defining the following macros:
     50   * UNRESOLVED(ret, descr);
     51   *    where descr is a description of the error and ret is an int (error code for example)
     52   * FAILED(descr);
     53   *    where descr is a short text saying why the test has failed.
     54   * PASSED();
     55   *    No parameter.
     56   *
     57   * Both three macros shall terminate the calling process.
     58   * The testcase shall not terminate in any other maneer.
     59   *
     60   * The other file defines the functions
     61   * void output_init()
     62   * void output(char * string, ...)
     63   *
     64   * Those may be used to output information.
     65   */
     66 
     67 /********************************************************************************************/
     68 /********************************** Configuration ******************************************/
     69 /********************************************************************************************/
     70 #ifndef VERBOSE
     71 #define VERBOSE 1
     72 #endif
     73 
     74 #define WITH_SYNCHRO
     75 
     76 /********************************************************************************************/
     77 /***********************************    Test cases  *****************************************/
     78 /********************************************************************************************/
     79 
     80 volatile int do_it = 1;
     81 unsigned long count_ope = 0;
     82 #ifdef WITH_SYNCHRO
     83 sem_t semsig1;
     84 sem_t semsig2;
     85 unsigned long count_sig = 0;
     86 #endif
     87 
     88 sigset_t usersigs;
     89 
     90 typedef struct {
     91 	int sig;
     92 #ifdef WITH_SYNCHRO
     93 	sem_t *sem;
     94 #endif
     95 } thestruct;
     96 
     97 /* the following function keeps on sending the signal to the process */
     98 void *sendsig(void *arg)
     99 {
    100 	thestruct *thearg = (thestruct *) arg;
    101 	int ret;
    102 	pid_t process;
    103 
    104 	process = getpid();
    105 
    106 	/* We block the signals SIGUSR1 and SIGUSR2 for this THREAD */
    107 	ret = pthread_sigmask(SIG_BLOCK, &usersigs, NULL);
    108 	if (ret != 0) {
    109 		UNRESOLVED(ret,
    110 			   "Unable to block SIGUSR1 and SIGUSR2 in signal thread");
    111 	}
    112 
    113 	while (do_it) {
    114 #ifdef WITH_SYNCHRO
    115 		if ((ret = sem_wait(thearg->sem))) {
    116 			UNRESOLVED(errno, "Sem_wait in sendsig");
    117 		}
    118 		count_sig++;
    119 #endif
    120 
    121 		ret = kill(process, thearg->sig);
    122 		if (ret != 0) {
    123 			UNRESOLVED(errno, "Kill in sendsig");
    124 		}
    125 
    126 	}
    127 	return NULL;
    128 }
    129 
    130 /* Next are the signal handlers. */
    131 /* This one is registered for signal SIGUSR1 */
    132 void sighdl1(int sig)
    133 {
    134 #ifdef WITH_SYNCHRO
    135 	if (sem_post(&semsig1)) {
    136 		UNRESOLVED(errno, "Sem_post in signal handler 1");
    137 	}
    138 #endif
    139 }
    140 
    141 /* This one is registered for signal SIGUSR2 */
    142 void sighdl2(int sig)
    143 {
    144 #ifdef WITH_SYNCHRO
    145 	if (sem_post(&semsig2)) {
    146 		UNRESOLVED(errno, "Sem_post in signal handler 2");
    147 	}
    148 #endif
    149 }
    150 
    151 /* Test function -- calls pthread_equal() and checks that EINTR is never returned. */
    152 void *test(void *arg)
    153 {
    154 	int ret = 0;
    155 
    156 	pthread_t me = pthread_self();
    157 
    158 	/* We don't block the signals SIGUSR1 and SIGUSR2 for this THREAD */
    159 	ret = pthread_sigmask(SIG_UNBLOCK, &usersigs, NULL);
    160 	if (ret != 0) {
    161 		UNRESOLVED(ret,
    162 			   "Unable to unblock SIGUSR1 and SIGUSR2 in worker thread");
    163 	}
    164 
    165 	while (do_it) {
    166 		count_ope++;
    167 
    168 		ret = pthread_equal(me, *(pthread_t *) arg);
    169 		if (ret != 0) {
    170 			UNRESOLVED(ret,
    171 				   "pthread_equal failed to return the correct value");
    172 		}
    173 
    174 		ret = pthread_equal(me, me);
    175 		if (ret == 0) {
    176 			UNRESOLVED(ret, "pthread_equal returned a bad result");
    177 		}
    178 		if (ret == EINTR) {
    179 			FAILED("pthread_equal returned EINTR status");
    180 		}
    181 	}
    182 	return NULL;
    183 }
    184 
    185 /* Main function */
    186 int main(void)
    187 {
    188 	int ret;
    189 	pthread_t th_work, th_sig1, th_sig2, me;
    190 	thestruct arg1, arg2;
    191 	struct sigaction sa;
    192 
    193 	/* Initialize output routine */
    194 	output_init();
    195 
    196 	/* We need to register the signal handlers for the PROCESS */
    197 	sigemptyset(&sa.sa_mask);
    198 	sa.sa_flags = 0;
    199 	sa.sa_handler = sighdl1;
    200 	if ((ret = sigaction(SIGUSR1, &sa, NULL))) {
    201 		UNRESOLVED(ret, "Unable to register signal handler1");
    202 	}
    203 	sa.sa_handler = sighdl2;
    204 	if ((ret = sigaction(SIGUSR2, &sa, NULL))) {
    205 		UNRESOLVED(ret, "Unable to register signal handler2");
    206 	}
    207 
    208 	/* We prepare a signal set which includes SIGUSR1 and SIGUSR2 */
    209 	sigemptyset(&usersigs);
    210 	ret = sigaddset(&usersigs, SIGUSR1);
    211 	ret |= sigaddset(&usersigs, SIGUSR2);
    212 	if (ret != 0) {
    213 		UNRESOLVED(ret, "Unable to add SIGUSR1 or 2 to a signal set");
    214 	}
    215 
    216 	/* We now block the signals SIGUSR1 and SIGUSR2 for this THREAD */
    217 	ret = pthread_sigmask(SIG_BLOCK, &usersigs, NULL);
    218 	if (ret != 0) {
    219 		UNRESOLVED(ret,
    220 			   "Unable to block SIGUSR1 and SIGUSR2 in main thread");
    221 	}
    222 #ifdef WITH_SYNCHRO
    223 	if (sem_init(&semsig1, 0, 1)) {
    224 		UNRESOLVED(errno, "Semsig1  init");
    225 	}
    226 	if (sem_init(&semsig2, 0, 1)) {
    227 		UNRESOLVED(errno, "Semsig2  init");
    228 	}
    229 #endif
    230 
    231 	me = pthread_self();
    232 
    233 	if ((ret = pthread_create(&th_work, NULL, test, (void *)&me))) {
    234 		UNRESOLVED(ret, "Worker thread creation failed");
    235 	}
    236 
    237 	arg1.sig = SIGUSR1;
    238 	arg2.sig = SIGUSR2;
    239 #ifdef WITH_SYNCHRO
    240 	arg1.sem = &semsig1;
    241 	arg2.sem = &semsig2;
    242 #endif
    243 
    244 	if ((ret = pthread_create(&th_sig1, NULL, sendsig, (void *)&arg1))) {
    245 		UNRESOLVED(ret, "Signal 1 sender thread creation failed");
    246 	}
    247 	if ((ret = pthread_create(&th_sig2, NULL, sendsig, (void *)&arg2))) {
    248 		UNRESOLVED(ret, "Signal 2 sender thread creation failed");
    249 	}
    250 
    251 	/* Let's wait for a while now */
    252 	sleep(1);
    253 
    254 	/* Now stop the threads and join them */
    255 	do {
    256 		do_it = 0;
    257 	}
    258 	while (do_it);
    259 
    260 	if ((ret = pthread_join(th_sig1, NULL))) {
    261 		UNRESOLVED(ret, "Signal 1 sender thread join failed");
    262 	}
    263 
    264 	if ((ret = pthread_join(th_sig2, NULL))) {
    265 		UNRESOLVED(ret, "Signal 2 sender thread join failed");
    266 	}
    267 
    268 	if ((ret = pthread_join(th_work, NULL))) {
    269 		UNRESOLVED(ret, "Worker thread join failed");
    270 	}
    271 #if VERBOSE > 0
    272 	output("Test executed successfully.\n");
    273 	output("  %d thread comparison.\n", count_ope);
    274 #ifdef WITH_SYNCHRO
    275 	output("  %d signals were sent meanwhile.\n", count_sig);
    276 #endif
    277 #endif
    278 	PASSED;
    279 }
    280