1 /* $NetBSD: t_write.c,v 1.2 2011/10/19 16:19:30 jruoho 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 1.2 2011/10/19 16:19:30 jruoho Exp $"); 33 34 #include <sys/uio.h> 35 #include <sys/syslimits.h> 36 37 #include <atf-c.h> 38 #include <errno.h> 39 #include <fcntl.h> 40 #include <signal.h> 41 #include <stdio.h> 42 #include <stdint.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 static void sighandler(int); 47 48 static bool fail = false; 49 static const char *path = "write"; 50 51 static void 52 sighandler(int signo) 53 { 54 fail = false; 55 } 56 57 ATF_TC_WITH_CLEANUP(write_err); 58 ATF_TC_HEAD(write_err, tc) 59 { 60 atf_tc_set_md_var(tc, "descr", "Checks errors from write(2)"); 61 } 62 63 ATF_TC_BODY(write_err, tc) 64 { 65 char rbuf[3] = { 'a', 'b', 'c' }; 66 char wbuf[3] = { 'x', 'y', 'z' }; 67 int fd; 68 69 errno = 0; 70 ATF_REQUIRE_ERRNO(EBADF, write(-1, wbuf, sizeof(wbuf)) == -1); 71 72 fd = open(path, O_RDWR | O_CREAT); 73 74 if (fd >= 0) { 75 76 errno = 0; 77 ATF_REQUIRE_ERRNO(0, write(fd, wbuf, 3) == 3); 78 79 errno = 0; 80 ATF_REQUIRE_ERRNO(EINVAL, write(fd, wbuf, SIZE_MAX) == -1); 81 82 errno = 0; 83 ATF_REQUIRE_ERRNO(EFAULT, write(fd, (void *)-1, 1) == -1); 84 85 /* 86 * Check that the above bogus write(2) 87 * calls did not corrupt the file. 88 */ 89 ATF_REQUIRE(lseek(fd, 0, SEEK_SET) == 0); 90 ATF_REQUIRE(read(fd, rbuf, 3) == 3); 91 ATF_REQUIRE(memcmp(rbuf, wbuf, 3) == 0); 92 93 (void)close(fd); 94 (void)unlink(path); 95 } 96 } 97 98 ATF_TC_CLEANUP(write_err, tc) 99 { 100 (void)unlink(path); 101 } 102 103 ATF_TC(write_pipe); 104 ATF_TC_HEAD(write_pipe, tc) 105 { 106 atf_tc_set_md_var(tc, "descr", "Checks for EPIPE from write(2)"); 107 } 108 109 ATF_TC_BODY(write_pipe, tc) 110 { 111 int fds[2]; 112 113 ATF_REQUIRE(pipe(fds) == 0); 114 ATF_REQUIRE(signal(SIGPIPE, sighandler) == 0); 115 116 ATF_REQUIRE(write(fds[1], "x", 1) != -1); 117 ATF_REQUIRE(close(fds[0]) == 0); 118 119 errno = 0; 120 fail = true; 121 122 if (write(fds[1], "x", 1) != -1 || errno != EPIPE) 123 atf_tc_fail_nonfatal("expected EPIPE but write(2) succeeded"); 124 125 ATF_REQUIRE(close(fds[1]) == 0); 126 127 if (fail != false) 128 atf_tc_fail_nonfatal("SIGPIPE was not raised"); 129 } 130 131 ATF_TC_WITH_CLEANUP(write_pos); 132 ATF_TC_HEAD(write_pos, tc) 133 { 134 atf_tc_set_md_var(tc, "descr", "Checks that write(2) " 135 "updates the file position"); 136 } 137 138 ATF_TC_BODY(write_pos, tc) 139 { 140 const size_t n = 123; 141 size_t i; 142 int fd; 143 144 fd = open(path, O_RDWR | O_CREAT); 145 ATF_REQUIRE(fd >= 0); 146 147 for (i = 0; i < n; i++) { 148 ATF_REQUIRE(write(fd, "x", 1) == 1); 149 ATF_REQUIRE(lseek(fd, 0, SEEK_CUR) == (off_t)(i + 1)); 150 } 151 152 ATF_REQUIRE(close(fd) == 0); 153 ATF_REQUIRE(unlink(path) == 0); 154 } 155 156 ATF_TC_CLEANUP(write_pos, tc) 157 { 158 (void)unlink(path); 159 } 160 161 ATF_TC_WITH_CLEANUP(write_ret); 162 ATF_TC_HEAD(write_ret, tc) 163 { 164 atf_tc_set_md_var(tc, "descr", "Checks return values from write(2)"); 165 } 166 167 ATF_TC_BODY(write_ret, tc) 168 { 169 const size_t n = 99; 170 char buf[123]; 171 size_t i, j; 172 int fd; 173 174 fd = open(path, O_WRONLY | O_CREAT); 175 ATF_REQUIRE(fd >= 0); 176 177 (void)memset(buf, 'x', sizeof(buf)); 178 179 for (i = j = 0; i < n; i++) 180 j += write(fd, buf, sizeof(buf)); 181 182 if (j != n * 123) 183 atf_tc_fail("inconsistent return values from write(2)"); 184 185 (void)close(fd); 186 (void)unlink(path); 187 } 188 189 ATF_TC_CLEANUP(write_ret, tc) 190 { 191 (void)unlink(path); 192 } 193 194 ATF_TC(writev_iovmax); 195 ATF_TC_HEAD(writev_iovmax, tc) 196 { 197 atf_tc_set_md_var(tc, "timeout", "10"); 198 atf_tc_set_md_var(tc, "descr", 199 "Checks that file descriptor is properly FILE_UNUSE()d " 200 "when iovcnt is greater than IOV_MAX"); 201 } 202 203 ATF_TC_BODY(writev_iovmax, tc) 204 { 205 ssize_t retval; 206 207 (void)printf("Calling writev(2, NULL, IOV_MAX + 1)...\n"); 208 209 errno = 0; 210 retval = writev(2, NULL, IOV_MAX + 1); 211 212 ATF_REQUIRE_EQ_MSG(retval, -1, "got: %zd", retval); 213 ATF_REQUIRE_EQ_MSG(errno, EINVAL, "got: %s", strerror(errno)); 214 } 215 216 ATF_TP_ADD_TCS(tp) 217 { 218 219 ATF_TP_ADD_TC(tp, write_err); 220 ATF_TP_ADD_TC(tp, write_pipe); 221 ATF_TP_ADD_TC(tp, write_pos); 222 ATF_TP_ADD_TC(tp, write_ret); 223 ATF_TP_ADD_TC(tp, writev_iovmax); 224 225 return atf_no_error(); 226 } 227