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 * DESCRIPTION 22 * Testcase to check that open(2) sets EMFILE if a process opens files 23 * more than its descriptor size 24 * 25 * ALGORITHM 26 * First get the file descriptor table size which is set for a process. 27 * Use open(2) for creating files till the descriptor table becomes full. 28 * These open(2)s should succeed. Finally use open(2) to open another 29 * file. This attempt should fail with EMFILE. 30 */ 31 32 #include <stdio.h> 33 #include <errno.h> 34 #include <fcntl.h> 35 #include <unistd.h> 36 #include "test.h" 37 38 char *TCID = "open04"; 39 int TST_TOTAL = 1; 40 41 static int fd, ifile, mypid, first; 42 static int nfile; 43 static int *buf; 44 static char fname[40]; 45 46 static void setup(void); 47 static void cleanup(void); 48 49 int main(int ac, char **av) 50 { 51 int lc; 52 53 tst_parse_opts(ac, av, NULL, NULL); 54 55 setup(); 56 57 for (lc = 0; TEST_LOOPING(lc); lc++) { 58 tst_count = 0; 59 60 TEST(open(fname, O_RDWR | O_CREAT, 0777)); 61 62 if (TEST_RETURN != -1) { 63 tst_resm(TFAIL, "call succeeded unexpectedly"); 64 continue; 65 } 66 67 if (TEST_ERRNO != EMFILE) 68 tst_resm(TFAIL, "Expected EMFILE, got %d", TEST_ERRNO); 69 else 70 tst_resm(TPASS, "call returned expected EMFILE error"); 71 } 72 73 close(first); 74 close(fd); 75 cleanup(); 76 tst_exit(); 77 } 78 79 static void setup(void) 80 { 81 tst_sig(NOFORK, DEF_HANDLER, cleanup); 82 83 TEST_PAUSE; 84 85 /* make a temporary directory and cd to it */ 86 tst_tmpdir(); 87 88 mypid = getpid(); 89 nfile = getdtablesize(); 90 sprintf(fname, "open04.%d", mypid); 91 92 first = fd = open(fname, O_RDWR | O_CREAT, 0777); 93 if (first == -1) 94 tst_brkm(TBROK, cleanup, "Cannot open first file"); 95 96 close(fd); 97 close(first); 98 unlink(fname); 99 100 /* Allocate memory for stat and ustat structure variables */ 101 buf = malloc(sizeof(int) * nfile - first); 102 if (buf == NULL) 103 tst_brkm(TBROK, NULL, "Failed to allocate Memory"); 104 105 for (ifile = first; ifile <= nfile; ifile++) { 106 sprintf(fname, "open04.%d.%d", ifile, mypid); 107 fd = open(fname, O_RDWR | O_CREAT, 0777); 108 if (fd == -1) { 109 if (errno != EMFILE) { 110 tst_brkm(TBROK, cleanup, "Expected EMFILE got " 111 "%d", errno); 112 } 113 break; 114 } 115 buf[ifile - first] = fd; 116 } 117 } 118 119 static void cleanup(void) 120 { 121 close(first); 122 123 for (ifile = first; ifile < nfile; ifile++) { 124 sprintf(fname, "open04.%d.%d", ifile, mypid); 125 close(buf[ifile - first]); 126 unlink(fname); 127 } 128 129 free(buf); 130 131 /* delete the test directory created in setup() */ 132 tst_rmdir(); 133 } 134
