1 /* $NetBSD: t_dup.c,v 1.2 2011/07/07 10:27:31 jruoho Exp $ */ 2 3 /*- 4 * Copyright (c) 2011 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jukka Ruohonen. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 #include <sys/cdefs.h> 32 __RCSID("$NetBSD: t_dup.c,v 1.2 2011/07/07 10:27:31 jruoho Exp $"); 33 34 #include <sys/resource.h> 35 #include <sys/stat.h> 36 #include <sys/wait.h> 37 38 #include <atf-c.h> 39 #include <errno.h> 40 #include <fcntl.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 #include <sysexits.h> 46 47 static char path[] = "dup"; 48 49 ATF_TC(dup_err); 50 ATF_TC_HEAD(dup_err, tc) 51 { 52 atf_tc_set_md_var(tc, "descr", "Test error conditions of dup(2)"); 53 } 54 55 ATF_TC_BODY(dup_err, tc) 56 { 57 ATF_REQUIRE(dup(-1) != 0); 58 } 59 60 ATF_TC_WITH_CLEANUP(dup_max); 61 ATF_TC_HEAD(dup_max, tc) 62 { 63 atf_tc_set_md_var(tc, "descr", "Test dup(2) against limits"); 64 } 65 66 ATF_TC_BODY(dup_max, tc) 67 { 68 struct rlimit res; 69 int *buf, fd, sta; 70 size_t i, n; 71 pid_t pid; 72 73 pid = fork(); 74 ATF_REQUIRE(pid >= 0); 75 76 if (pid == 0) { 77 78 /* 79 * Open a temporary file until the 80 * maximum number of open files is 81 * reached. Ater that dup(2) should 82 * fail with EMFILE. 83 */ 84 (void)closefrom(0); 85 (void)memset(&res, 0, sizeof(struct rlimit)); 86 87 if (getrlimit(RLIMIT_NOFILE, &res) != 0) 88 _exit(EX_OSERR); 89 90 if (res.rlim_cur == 0 || res.rlim_max == 0) 91 _exit(EX_OSERR); 92 93 n = res.rlim_cur; 94 buf = calloc(n, sizeof(int)); 95 96 if (buf == NULL) 97 _exit(EX_OSERR); 98 99 buf[0] = mkstemp(path); 100 101 if (buf[0] < 0) 102 _exit(EX_OSERR); 103 104 for (i = 1; i < n; i++) { 105 106 buf[i] = open(path, O_RDONLY); 107 108 if (buf[i] < 0) 109 _exit(EX_OSERR); 110 } 111 112 errno = 0; 113 fd = dup(buf[0]); 114 115 if (fd != -1 || errno != EMFILE) 116 _exit(EX_DATAERR); 117 118 _exit(EXIT_SUCCESS); 119 } 120 121 (void)wait(&sta); 122 123 if (WIFEXITED(sta) == 0 || WEXITSTATUS(sta) != EXIT_SUCCESS) { 124 125 if (WEXITSTATUS(sta) == EX_OSERR) 126 atf_tc_fail("unknown error"); 127 128 if (WEXITSTATUS(sta) == EX_DATAERR) 129 atf_tc_fail("dup(2) dupped more than RLIMIT_NOFILE"); 130 } 131 } 132 133 ATF_TC_CLEANUP(dup_max, tc) 134 { 135 (void)unlink(path); 136 } 137 138 ATF_TC_WITH_CLEANUP(dup_mode); 139 ATF_TC_HEAD(dup_mode, tc) 140 { 141 atf_tc_set_md_var(tc, "descr", "A basic test of dup(2)"); 142 } 143 144 ATF_TC_BODY(dup_mode, tc) 145 { 146 int mode[3] = { O_RDONLY, O_WRONLY, O_RDWR }; 147 int perm[5] = { 0700, 0400, 0600, 0444, 0666 }; 148 struct stat st1, st2; 149 int fd1, fd2; 150 size_t i, j; 151 152 /* 153 * Check that a duplicated descriptor 154 * retains the mode of the original file. 155 */ 156 for (i = 0; i < __arraycount(mode); i++) { 157 158 for (j = 0; j < __arraycount(perm); j++) { 159 160 fd1 = open(path, mode[i] | O_CREAT, perm[j]); 161 162 if (fd1 < 0) 163 return; 164 165 fd2 = dup(fd1); 166 ATF_REQUIRE(fd2 >= 0); 167 168 (void)memset(&st1, 0, sizeof(struct stat)); 169 (void)memset(&st2, 0, sizeof(struct stat)); 170 171 ATF_REQUIRE(fstat(fd1, &st1) == 0); 172 ATF_REQUIRE(fstat(fd2, &st2) == 0); 173 174 if (st1.st_mode != st2.st_mode) 175 atf_tc_fail("invalid mode"); 176 177 ATF_REQUIRE(close(fd1) == 0); 178 ATF_REQUIRE(close(fd2) == 0); 179 ATF_REQUIRE(unlink(path) == 0); 180 } 181 } 182 } 183 184 ATF_TC_CLEANUP(dup_mode, tc) 185 { 186 (void)unlink(path); 187 } 188 189 ATF_TP_ADD_TCS(tp) 190 { 191 192 ATF_TP_ADD_TC(tp, dup_err); 193 ATF_TP_ADD_TC(tp, dup_max); 194 ATF_TP_ADD_TC(tp, dup_mode); 195 196 return atf_no_error(); 197 } 198