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      1 /*
      2 * Copyright (c) 2005, 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 assertions:
     18 *
     19 * If SA_NODEFER is not set in sa_flags, the caught signal is added to the
     20 * thread's signal mask during the handler execution.
     21 
     22 * The steps are:
     23 * -> register a signal handler for SIGSEGV
     24 * -> raise SIGSEGV
     25 * -> In handler, check for reentrance then raise SIGSEGV again.
     26 
     27 * The test fails if signal handler if reentered or signal is not pending when raised again.
     28 */
     29 
     30 
     31 /******************************************************************************/
     32 /*************************** standard includes ********************************/
     33 /******************************************************************************/
     34 #include <pthread.h>
     35 #include <stdarg.h>
     36 #include <stdio.h>
     37 #include <stdlib.h>
     38 #include <string.h>
     39 #include <unistd.h>
     40 
     41 #include <signal.h>
     42 #include <errno.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
     52  *   (error code for example)
     53  * FAILED(descr);
     54  *    where descr is a short text saying why the test has failed.
     55  * PASSED();
     56  *    No parameter.
     57  *
     58  * Both three macros shall terminate the calling process.
     59  * The testcase shall not terminate in any other maneer.
     60  *
     61  * The other file defines the functions
     62  * void output_init()
     63  * void output(char * string, ...)
     64  *
     65  * Those may be used to output information.
     66  */
     67 
     68 /******************************************************************************/
     69 /**************************** Configuration ***********************************/
     70 /******************************************************************************/
     71 #ifndef VERBOSE
     72 #define VERBOSE 1
     73 #endif
     74 
     75 #define SIGNAL SIGSEGV
     76 
     77 /******************************************************************************/
     78 /***************************    Test case   ***********************************/
     79 /******************************************************************************/
     80 
     81 int called = 0;
     82 
     83 void handler(int sig)
     84 {
     85 	int ret;
     86 	sigset_t pending;
     87 	called++;
     88 
     89 	if (called == 2) {
     90 		FAILED("Signal was not masked in signal handler");
     91 	}
     92 
     93 	if (called == 1) {
     94 
     95 		/* Raise the signal again. It should be masked */
     96 		ret = raise(SIGNAL);
     97 
     98 		if (ret != 0) {
     99 			UNRESOLVED(ret, "Failed to raise SIGSEGV again");
    100 		}
    101 
    102 		/* check the signal is pending */
    103 		ret = sigpending(&pending);
    104 
    105 		if (ret != 0) {
    106 			UNRESOLVED(ret, "Failed to get pending signal set");
    107 		}
    108 
    109 		ret = sigismember(&pending, SIGNAL);
    110 
    111 		if (ret != 1) {
    112 			FAILED("signal is not pending");
    113 		}
    114 	}
    115 
    116 	called++;
    117 }
    118 
    119 /* main function */
    120 int main(void)
    121 {
    122 	int ret;
    123 
    124 	struct sigaction sa;
    125 
    126 	/* Initialize output */
    127 	output_init();
    128 
    129 	/* Set the signal handler */
    130 	sa.sa_flags = 0;
    131 
    132 	sa.sa_handler = handler;
    133 
    134 	ret = sigemptyset(&sa.sa_mask);
    135 
    136 	if (ret != 0) {
    137 		UNRESOLVED(ret, "Failed to empty signal set");
    138 	}
    139 
    140 	/* Install the signal handler for SIGSEGV */
    141 	ret = sigaction(SIGNAL, &sa, 0);
    142 
    143 	if (ret != 0) {
    144 		UNRESOLVED(ret, "Failed to set signal handler");
    145 	}
    146 
    147 	ret = raise(SIGNAL);
    148 
    149 	if (ret != 0) {
    150 		UNRESOLVED(ret, "Failed to raise SIGSEGV");
    151 	}
    152 
    153 	while (called != 4)
    154 		sched_yield();
    155 
    156 	/* Test passed */
    157 #if VERBOSE > 0
    158 
    159 	output("Test passed\n");
    160 
    161 #endif
    162 
    163 	PASSED;
    164 }
    165