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 * pipe06.c 23 * 24 * DESCRIPTION 25 * Check what happens when the system runs out of pipes. 26 * 27 * ALGORITHM 28 * Issue enough pipe calls to run the system out of pipes. 29 * Check that we get EMFILE. 30 * 31 * USAGE: <for command-line> 32 * pipe06 [-c n] [-e] [-i n] [-I x] [-P x] [-t] 33 * where, -c n : Run n copies concurrently. 34 * -e : Turn on errno logging. 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 Ported by Wayne Boyer 42 * 43 * RESTRICTIONS 44 * None 45 */ 46#include <fcntl.h> 47#include <errno.h> 48#include "test.h" 49 50char *TCID = "pipe06"; 51int TST_TOTAL = 1; 52 53int pipe_ret, pipes[2]; 54void setup(void); 55void cleanup(void); 56 57int main(int ac, char **av) 58{ 59 int lc; 60 61 tst_parse_opts(ac, av, NULL, NULL); 62 63 setup(); 64 65 for (lc = 0; TEST_LOOPING(lc); lc++) { 66 67 /* reset tst_count in case we are looping */ 68 tst_count = 0; 69 70 TEST(pipe(pipes)); 71 72 if (TEST_RETURN != -1) { 73 tst_resm(TFAIL, "call succeeded unexpectedly"); 74 } 75 76 if (TEST_ERRNO != EMFILE) { 77 tst_resm(TFAIL | TTERRNO, "pipe failed unexpectedly"); 78 } else { 79 tst_resm(TPASS, "failed with EMFILE"); 80 } 81 82 } 83 cleanup(); 84 tst_exit(); 85 86} 87 88/* 89 * setup() - performs all ONE TIME setup for this test. 90 */ 91void setup(void) 92{ 93 int i, numb_fds; 94 95 tst_sig(NOFORK, DEF_HANDLER, cleanup); 96 97 TEST_PAUSE; 98 99 numb_fds = getdtablesize(); 100 101 for (i = 0; i < numb_fds; i++) { 102 pipe_ret = pipe(pipes); 103 if (pipe_ret < 0) { 104 if (errno != EMFILE) { 105 tst_brkm(TBROK | TTERRNO, cleanup, 106 "didn't get EMFILE"); 107 } 108 break; 109 } 110 } 111} 112 113/* 114 * cleanup() - performs all ONE TIME cleanup for this test at 115 * completion or premature exit. 116 */ 117void cleanup(void) 118{ 119} 120