1 /* $NetBSD: t_write.c,v 1.7 2019/07/16 17:29:18 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2001, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __COPYRIGHT("@(#) Copyright (c) 2008\ 31 The NetBSD Foundation, inc. All rights reserved."); 32 __RCSID("$NetBSD: t_write.c,v 1.7 2019/07/16 17:29:18 martin Exp $"); 33 34 #include <sys/uio.h> 35 #include <sys/mman.h> 36 37 #include <atf-c.h> 38 #include <errno.h> 39 #include <fcntl.h> 40 #include <signal.h> 41 #include <limits.h> 42 #include <stdio.h> 43 #include <stdint.h> 44 #include <string.h> 45 #include <unistd.h> 46 #include <paths.h> 47 48 static void sighandler(int); 49 50 static bool fail = false; 51 static const char *path = "write"; 52 53 static void 54 sighandler(int signo __unused) 55 { 56 fail = false; 57 } 58 59 ATF_TC_WITH_CLEANUP(write_err); 60 ATF_TC_HEAD(write_err, tc) 61 { 62 atf_tc_set_md_var(tc, "descr", "Checks errors from write(2)"); 63 } 64 65 ATF_TC_BODY(write_err, tc) 66 { 67 char rbuf[3] = { 'a', 'b', 'c' }; 68 char wbuf[3] = { 'x', 'y', 'z' }; 69 int fd; 70 71 errno = 0; 72 ATF_REQUIRE_ERRNO(EBADF, write(-1, wbuf, sizeof(wbuf)) == -1); 73 74 fd = open(path, O_RDWR | O_CREAT, 0600); 75 76 if (fd >= 0) { 77 78 errno = 0; 79 ATF_REQUIRE_ERRNO(0, write(fd, wbuf, 3) == 3); 80 81 errno = 0; 82 ATF_REQUIRE_ERRNO(EINVAL, write(fd, wbuf, SIZE_MAX) == -1); 83 84 errno = 0; 85 ATF_REQUIRE_ERRNO(EFAULT, write(fd, (void *)-1, 1) == -1); 86 87 /* 88 * Check that the above bogus write(2) 89 * calls did not corrupt the file. 90 */ 91 ATF_REQUIRE(lseek(fd, 0, SEEK_SET) == 0); 92 ATF_REQUIRE(read(fd, rbuf, 3) == 3); 93 ATF_REQUIRE(memcmp(rbuf, wbuf, 3) == 0); 94 95 (void)close(fd); 96 (void)unlink(path); 97 } 98 } 99 100 ATF_TC_CLEANUP(write_err, tc) 101 { 102 (void)unlink(path); 103 } 104 105 ATF_TC(write_pipe); 106 ATF_TC_HEAD(write_pipe, tc) 107 { 108 atf_tc_set_md_var(tc, "descr", "Checks for EPIPE from write(2)"); 109 } 110 111 ATF_TC_BODY(write_pipe, tc) 112 { 113 int fds[2]; 114 115 ATF_REQUIRE(pipe(fds) == 0); 116 ATF_REQUIRE(signal(SIGPIPE, sighandler) == 0); 117 118 ATF_REQUIRE(write(fds[1], "x", 1) != -1); 119 ATF_REQUIRE(close(fds[0]) == 0); 120 121 errno = 0; 122 fail = true; 123 124 if (write(fds[1], "x", 1) != -1 || errno != EPIPE) 125 atf_tc_fail_nonfatal("expected EPIPE but write(2) succeeded"); 126 127 ATF_REQUIRE(close(fds[1]) == 0); 128 129 if (fail != false) 130 atf_tc_fail_nonfatal("SIGPIPE was not raised"); 131 } 132 133 ATF_TC_WITH_CLEANUP(write_pos); 134 ATF_TC_HEAD(write_pos, tc) 135 { 136 atf_tc_set_md_var(tc, "descr", "Checks that write(2) " 137 "updates the file position"); 138 } 139 140 ATF_TC_BODY(write_pos, tc) 141 { 142 const size_t n = 123; 143 size_t i; 144 int fd; 145 146 fd = open(path, O_RDWR | O_CREAT, 0600); 147 ATF_REQUIRE(fd >= 0); 148 149 for (i = 0; i < n; i++) { 150 ATF_REQUIRE(write(fd, "x", 1) == 1); 151 ATF_REQUIRE(lseek(fd, 0, SEEK_CUR) == (off_t)(i + 1)); 152 } 153 154 ATF_REQUIRE(close(fd) == 0); 155 ATF_REQUIRE(unlink(path) == 0); 156 } 157 158 ATF_TC_CLEANUP(write_pos, tc) 159 { 160 (void)unlink(path); 161 } 162 163 ATF_TC_WITH_CLEANUP(write_ret); 164 ATF_TC_HEAD(write_ret, tc) 165 { 166 atf_tc_set_md_var(tc, "descr", "Checks return values from write(2)"); 167 } 168 169 ATF_TC_BODY(write_ret, tc) 170 { 171 const size_t n = 99; 172 char buf[123]; 173 size_t i, j; 174 int fd; 175 176 fd = open(path, O_WRONLY | O_CREAT, 0600); 177 ATF_REQUIRE(fd >= 0); 178 179 (void)memset(buf, 'x', sizeof(buf)); 180 181 for (i = j = 0; i < n; i++) 182 j += write(fd, buf, sizeof(buf)); 183 184 if (j != n * 123) 185 atf_tc_fail("inconsistent return values from write(2)"); 186 187 (void)close(fd); 188 (void)unlink(path); 189 } 190 191 ATF_TC_CLEANUP(write_ret, tc) 192 { 193 (void)unlink(path); 194 } 195 196 ATF_TC(writev_iovmax); 197 ATF_TC_HEAD(writev_iovmax, tc) 198 { 199 atf_tc_set_md_var(tc, "timeout", "10"); 200 atf_tc_set_md_var(tc, "descr", 201 "Checks that file descriptor is properly FILE_UNUSE()d " 202 "when iovcnt is greater than IOV_MAX"); 203 } 204 205 ATF_TC_BODY(writev_iovmax, tc) 206 { 207 ssize_t retval; 208 209 (void)printf("Calling writev(2, NULL, IOV_MAX + 1)...\n"); 210 211 errno = 0; 212 retval = writev(2, NULL, IOV_MAX + 1); 213 214 ATF_REQUIRE_EQ_MSG(retval, -1, "got: %zd", retval); 215 ATF_REQUIRE_EQ_MSG(errno, EINVAL, "got: %s", strerror(errno)); 216 } 217 218 ATF_TC(write_fault); 219 220 ATF_TC_HEAD(write_fault, tc) 221 { 222 atf_tc_set_md_var(tc, "descr", 223 "Check that writing to non-permitted space returns EFAULT"); 224 } 225 226 #define SIZE 8192 227 228 ATF_TC_BODY(write_fault, tc) 229 { 230 int fd[2]; 231 ATF_REQUIRE(pipe(fd) != -1); 232 // Can't use /dev/null cause it doesn't access the buffer. 233 234 void *map = mmap(NULL, SIZE, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0); 235 ATF_REQUIRE(map != MAP_FAILED); 236 237 ssize_t retval = write(fd[1], map, SIZE); 238 239 ATF_REQUIRE_EQ_MSG(retval, -1, "got: %zd", retval); 240 ATF_REQUIRE_EQ_MSG(errno, EFAULT, "got: %s", strerror(errno)); 241 242 munmap(map, SIZE); 243 close(fd[0]); 244 close(fd[1]); 245 } 246 247 ATF_TC(read_fault); 248 249 ATF_TC_HEAD(read_fault, tc) 250 { 251 atf_tc_set_md_var(tc, "descr", 252 "Check that reading from non-permitted space returns EFAULT"); 253 } 254 255 ATF_TC_BODY(read_fault, tc) 256 { 257 int fd = open(_PATH_DEVZERO, O_RDONLY); 258 ATF_REQUIRE(fd != -1); 259 260 void *map = mmap(NULL, SIZE, PROT_NONE, MAP_ANON | MAP_PRIVATE, -1, 0); 261 ATF_REQUIRE(map != MAP_FAILED); 262 263 ssize_t retval = read(fd, map, SIZE); 264 265 ATF_REQUIRE_EQ_MSG(retval, -1, "got: %zd", retval); 266 ATF_REQUIRE_EQ_MSG(errno, EFAULT, "got: %s", strerror(errno)); 267 268 munmap(map, SIZE); 269 close(fd); 270 } 271 272 ATF_TP_ADD_TCS(tp) 273 { 274 275 ATF_TP_ADD_TC(tp, write_err); 276 ATF_TP_ADD_TC(tp, write_pipe); 277 ATF_TP_ADD_TC(tp, write_pos); 278 ATF_TP_ADD_TC(tp, write_ret); 279 ATF_TP_ADD_TC(tp, writev_iovmax); 280 ATF_TP_ADD_TC(tp, write_fault); 281 ATF_TP_ADD_TC(tp, read_fault); 282 283 return atf_no_error(); 284 } 285
Indexes created Sat Sep 20 22:09:52 GMT 2025