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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  *	pipe08.c
     23  *
     24  * DESCRIPTION
     25  *	Check that a SIGPIPE signal is generated when a write is
     26  *	attempted on an empty pipe.
     27  *
     28  * ALGORITHM
     29  *	1. Write to a pipe after closing the read side.
     30  *	2. Check for the signal SIGPIPE to be received.
     31  *
     32  * USAGE:  <for command-line>
     33  *  pipe08 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
     34  *     where,  -c n : Run n copies concurrently.
     35  *             -f   : Turn off functionality Testing.
     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  * USAGE
     42  *	pipe08
     43  *
     44  * HISTORY
     45  *	07/2001 Ported by Wayne Boyer
     46  *
     47  * RESTRICTIONS
     48  *	None
     49  */
     50 #include <errno.h>
     51 #include <unistd.h>
     52 #include <signal.h>
     53 #include <string.h>
     54 #include "test.h"
     55 
     56 char *TCID = "pipe08";
     57 int TST_TOTAL = 1;
     58 
     59 void setup(void);
     60 void cleanup(void);
     61 void sighandler(int);
     62 
     63 int main(int ac, char **av)
     64 {
     65 	int lc;
     66 
     67 	int pipefd[2];		/* fds for pipe read/write */
     68 	char wrbuf[BUFSIZ];
     69 	int written, length;
     70 	int close_stat;		/*  exit status of close(read fd) */
     71 
     72 	tst_parse_opts(ac, av, NULL, NULL);
     73 
     74 	setup();
     75 
     76 	for (lc = 0; TEST_LOOPING(lc); lc++) {
     77 
     78 		/* reset tst_count in case we are looping */
     79 		tst_count = 0;
     80 
     81 		TEST(pipe(pipefd));
     82 
     83 		if (TEST_RETURN != 0) {
     84 			tst_resm(TFAIL, "call failed unexpectedly");
     85 			continue;
     86 		}
     87 
     88 		if ((close_stat = close(pipefd[0])) == -1) {
     89 			tst_brkm(TBROK, cleanup, "close of read side failed");
     90 		}
     91 
     92 		strcpy(wrbuf, "abcdefghijklmnopqrstuvwxyz\0");
     93 		length = strlen(wrbuf);
     94 
     95 		/*
     96 		 * the SIGPIPE signal will be caught here or else
     97 		 * the program will dump core when the signal is
     98 		 * sent
     99 		 */
    100 		written = write(pipefd[1], wrbuf, length);
    101 	}
    102 	cleanup();
    103 	tst_exit();
    104 
    105 }
    106 
    107 /*
    108  * sighandler - catch signals and look for SIGPIPE
    109  */
    110 void sighandler(int sig)
    111 {
    112 	if (sig != SIGPIPE)
    113 		tst_resm(TFAIL, "expected SIGPIPE, got %d", sig);
    114 	else
    115 		tst_resm(TPASS, "got expected SIGPIPE signal");
    116 }
    117 
    118 /*
    119  * setup() - performs all ONE TIME setup for this test.
    120  */
    121 void setup(void)
    122 {
    123 
    124 	tst_sig(NOFORK, sighandler, cleanup);
    125 
    126 	TEST_PAUSE;
    127 }
    128 
    129 /*
    130  * cleanup() - performs all ONE TIME cleanup for this test at
    131  *	       completion or premature exit.
    132  */
    133 void cleanup(void)
    134 {
    135 }
    136